Merge branch 'staging' into absl_mutex

2023-12-14 06:53:00 +01:00 · 2019-03-05 17:06:23 -05:00 · 2019-03-05 17:06:23 -05:00 · 1a09a12ee0
commit 1a09a12ee0
parent 61f3273dc4 33349fc7e5
471 changed files with 52989 additions and 386 deletions
--- a/.gitignore
+++ b/.gitignore
@ -40,7 +40,6 @@ daemon.ini
 lokinet-win32.exe
 lokinet
 lokinet.exe
-rapidjson/


 .gradle/
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@ -11,9 +11,9 @@ build:linux:
    - linux
  stage: build
  before_script:
-    - apk add --update g++ make cmake linux-headers libcap-dev rapidjson
+    - apk add --update g++ make cmake linux-headers libcap-dev
  script:
-    - make 
+    - make
  artifacts:
    paths:
      - "lokinet"
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -20,7 +20,7 @@ option(WITH_COVERAGE "generate coverage data")

 # Basic definitions
 get_filename_component(CORE_INCLUDE include ABSOLUTE)
-get_filename_component(ABYSS_INCLUDE "${CMAKE_CURRENT_LIST_DIR}/${ABYSS}/include" ABSOLUTE CACHE)
+get_filename_component(ABYSS_INCLUDE "${CMAKE_CURRENT_LIST_DIR}/${ABYSS}/include" ABSOLUTE)

 find_program(CCACHE_PROGRAM ccache)
 if(CCACHE_PROGRAM)
@ -54,6 +54,8 @@ if (WIN32 AND NOT STATIC_LINK_RUNTIME)
  #set(STATIC_LINK_RUNTIME ON)
 endif(WIN32 AND NOT STATIC_LINK_RUNTIME)

+add_subdirectory(vendor/nlohmann)
+
 # still need the headers unconditionally
 set(ABSEIL_DIR vendor/abseil-cpp)
 include_directories(${ABSEIL_DIR})
--- a/docker/debian.Dockerfile
+++ b/docker/debian.Dockerfile
@ -1,7 +1,7 @@
 FROM debian:stable

 RUN apt update && \
-    apt install -y build-essential cmake git libcap-dev curl rapidjson-dev ninja-build
+    apt install -y build-essential cmake git libcap-dev curl ninja-build

 WORKDIR /src/

--- a/docker/fedora.Dockerfile
+++ b/docker/fedora.Dockerfile
@ -2,7 +2,7 @@ FROM fedora:latest

 RUN dnf update -y && \
    dnf upgrade -y && \
-    dnf install -y cmake make git gcc gcc-c++ libcap-devel curl rapidjson-devel
+    dnf install -y cmake make git gcc gcc-c++ libcap-devel curl

 WORKDIR /src/

--- a/docker/loki-svc-kubernetes.Dockerfile
+++ b/docker/loki-svc-kubernetes.Dockerfile
@ -1,7 +1,7 @@
 FROM debian:stable

 RUN apt update && \
-    apt install -y build-essential cmake git libcap-dev curl rapidjson-dev python3-dev python3-setuptools libsodium-dev
+    apt install -y build-essential cmake git libcap-dev curl python3-dev python3-setuptools libsodium-dev

 WORKDIR /src/

@ -9,4 +9,4 @@ COPY . /src/

 RUN make -j 8 SHARED_LIB=ON JSONRPC=ON && make kubernetes-install

-ENTRYPOINT [ "/usr/bin/python3", "-m", "pylokinet"]
+ENTRYPOINT [ "/usr/bin/python3", "-m", "pylokinet"]
--- a/docker/ubuntu.Dockerfile
+++ b/docker/ubuntu.Dockerfile
@ -1,7 +1,7 @@
 FROM ubuntu:latest

 RUN apt update && \
-    apt install -y build-essential cmake git libcap-dev curl rapidjson-dev ninja-build
+    apt install -y build-essential cmake git libcap-dev curl ninja-build

 WORKDIR /src/

--- a/libabyss/include/abyss/client.hpp
+++ b/libabyss/include/abyss/client.hpp
@ -18,8 +18,8 @@ namespace abyss
  namespace http
  {
    using RPC_Method_t = std::string;
-    using RPC_Params   = llarp::json::Value;
-    using RPC_Response = llarp::json::Document;
+    using RPC_Params   = nlohmann::json;
+    using RPC_Response = nlohmann::json;
    using Headers_t    = std::unordered_multimap< std::string, std::string >;
    struct ConnImpl;

--- a/libabyss/include/abyss/server.hpp
+++ b/libabyss/include/abyss/server.hpp
@ -7,6 +7,7 @@
 #include <util/string_view.hpp>
 #include <util/time.hpp>

+#include <absl/types/optional.h>
 #include <list>
 #include <memory>
 #include <string>
@ -21,14 +22,13 @@ namespace abyss
    struct IRPCHandler
    {
      using Method_t = std::string;
-      using Params   = llarp::json::Value;
-      using Response = llarp::json::Writer;
+      using Params   = nlohmann::json;
+      using Response = nlohmann::json;

      IRPCHandler(ConnImpl* impl);

-      virtual bool
-      HandleJSONRPC(Method_t method, const Params& params,
-                    Response& response) = 0;
+      virtual absl::optional< Response >
+      HandleJSONRPC(Method_t method, const Params& params) = 0;

      virtual ~IRPCHandler();

--- a/libabyss/main.cpp
+++ b/libabyss/main.cpp
@ -13,14 +13,12 @@ struct DemoHandler : public abyss::httpd::IRPCHandler
  {
  }

-  bool
-  HandleJSONRPC(Method_t method, __attribute__((unused)) const Params& params,
-                Response& resp) override
+  absl::optional< Response >
+  HandleJSONRPC(Method_t method,
+                __attribute__((unused)) const Params& params) override
  {
    llarp::LogInfo("method: ", method);
-    resp.StartObject();
-    resp.EndObject();
-    return true;
+    return Response::object();
  }
 };

@ -83,9 +81,7 @@ struct DemoClient : public abyss::http::JSONRPC
  void
  DoDemoRequest()
  {
-    llarp::json::Value params;
-    params.SetObject();
-    QueueRPC("test", std::move(params),
+    QueueRPC("test", nlohmann::json::object(),
             std::bind(&DemoClient::NewConn, this, std::placeholders::_1));
    Flush();
  };
--- a/libabyss/src/client.cpp
+++ b/libabyss/src/client.cpp
@ -14,11 +14,11 @@ namespace abyss
      // big
      static const size_t MAX_BODY_SIZE = (1024 * 1024);
      llarp_tcp_conn* m_Conn;
-      json::Document m_RequestBody;
+      nlohmann::json m_RequestBody;
      Headers_t m_SendHeaders;
      IRPCClientHandler* handler;
      std::unique_ptr< json::IParser > m_BodyParser;
-      json::Document m_Response;
+      nlohmann::json m_Response;

      enum State
      {
@ -31,9 +31,12 @@ namespace abyss

      State state;

-      ConnImpl(llarp_tcp_conn* conn, RPC_Method_t method, RPC_Params params,
-               JSONRPC::HandlerFactory factory)
-          : m_Conn(conn), state(eInitial)
+      ConnImpl(llarp_tcp_conn* conn, const RPC_Method_t& method,
+               const RPC_Params& params, JSONRPC::HandlerFactory factory)
+          : m_Conn(conn)
+          , m_RequestBody(nlohmann::json::object())
+          , m_Response(nlohmann::json::object())
+          , state(eInitial)
      {
        srand(time(nullptr));
        conn->user   = this;
@ -43,18 +46,12 @@ namespace abyss

        handler = factory(this);

-        m_RequestBody.SetObject();
-        auto& alloc = m_RequestBody.GetAllocator();
-        m_RequestBody.AddMember("jsonrpc", json::Value().SetString("2.0"),
-                                alloc);
+        m_RequestBody["jsonrpc"] = "2.0";
        llarp::AlignedBuffer< 8 > p;
        p.Randomize();
-        std::string str = p.ToHex();
-        m_RequestBody.AddMember(
-            "id", json::Value().SetString(str.c_str(), alloc), alloc);
-        m_RequestBody.AddMember(
-            "method", json::Value().SetString(method.c_str(), alloc), alloc);
-        m_RequestBody.AddMember("params", params, alloc);
+        m_RequestBody["id"]     = p.ToHex();
+        m_RequestBody["method"] = method;
+        m_RequestBody["params"] = params;
      }

      static void
@ -220,8 +217,7 @@ namespace abyss
        // create request body
        std::string body;
        std::stringstream ss;
-        json::ToString(m_RequestBody, ss);
-        body = ss.str();
+        body = m_RequestBody.dump();
        m_SendHeaders.emplace("Content-Type", "application/json");
        m_SendHeaders.emplace("Content-Length", std::to_string(body.size()));
        m_SendHeaders.emplace("Accept", "application/json");
@ -347,8 +343,7 @@ namespace abyss
      }
      auto& front = m_PendingCalls.front();
      ConnImpl* connimpl =
-          new ConnImpl(conn, std::move(front.method), std::move(front.params),
-                       std::move(front.createHandler));
+          new ConnImpl(conn, front.method, front.params, front.createHandler);
      m_PendingCalls.pop_front();
      m_Conns.emplace_back(connimpl->handler);
      connimpl->SendRequest();
--- a/libabyss/src/server.cpp
+++ b/libabyss/src/server.cpp
@ -24,10 +24,7 @@ namespace abyss
      llarp_time_t m_ReadTimeout;
      bool m_Bad;
      std::unique_ptr< json::IParser > m_BodyParser;
-      json::Document m_Request;
-      std::stringstream m_ResponseBuffer;
-      json::Stream m_ResponseStream;
-      json::Writer m_Response;
+      nlohmann::json m_Request;

      enum HTTPState
      {
@ -43,10 +40,7 @@ namespace abyss
      HTTPState m_State;

      ConnImpl(BaseReqHandler* p, llarp_tcp_conn* c, llarp_time_t readtimeout)
-          : _conn(c)
-          , _parent(p)
-          , m_ResponseStream(m_ResponseBuffer)
-          , m_Response(m_ResponseStream)
+          : _conn(c), _parent(p)
      {
        handler       = nullptr;
        m_LastActive  = p->now();
@ -154,14 +148,13 @@ namespace abyss
        // initialize body parser
        if(m_BodyParser == nullptr)
        {
-          ssize_t contentLength = 0;
-          auto itr              = Header.Headers.find("content-length");
+          auto itr = Header.Headers.find("content-length");
          if(itr == Header.Headers.end())
          {
            return WriteResponseSimple(400, "Bad Request", "text/plain",
                                       "no content length");
          }
-          contentLength = std::stoll(itr->second);
+          ssize_t contentLength = std::stoll(itr->second);
          if(contentLength <= 0)
          {
            return WriteResponseSimple(400, "Bad Request", "text/plain",
@ -186,22 +179,21 @@ namespace abyss
            return WriteResponseSimple(400, "Bad Request", "text/plain",
                                       "bad json object");
          case json::IParser::eDone:
-            if(m_Request.IsObject() && m_Request.HasMember("params")
-               && m_Request.HasMember("method") && m_Request.HasMember("id")
-               && m_Request["id"].IsString() && m_Request["method"].IsString()
-               && m_Request["params"].IsObject())
+            if(m_Request.is_object() && m_Request.count("params")
+               && m_Request.count("method") && m_Request.count("id")
+               && m_Request["id"].is_string() && m_Request["method"].is_string()
+               && m_Request["params"].is_object())
            {
-              m_Response.StartObject();
-              m_Response.Key("jsonrpc");
-              m_Response.String("2.0");
-              m_Response.Key("id");
-              m_Response.String(m_Request["id"].GetString());
-              m_Response.Key("result");
-              if(handler->HandleJSONRPC(m_Request["method"].GetString(),
-                                        m_Request["params"], m_Response))
+              nlohmann::json response;
+              response["jsonrpc"]     = "2.0";
+              response["id"]          = m_Request["id"];
+              auto value              = handler->HandleJSONRPC(
+                  m_Request["method"].get< std::string >(),
+                  m_Request["params"]);
+              if(value)
              {
-                m_Response.EndObject();
-                return WriteResponseJSON();
+                response["result"] = value.value();
+                return WriteResponseJSON(response);
              }
            }
            return WriteResponseSimple(500, "internal error", "text/plain",
@ -212,13 +204,11 @@ namespace abyss
      }

      bool
-      WriteResponseJSON()
+      WriteResponseJSON(const nlohmann::json& response)
      {
-        std::string response;
-        m_ResponseStream.Flush();
-        response = m_ResponseBuffer.str();
+        std::string responseStr = response.dump();
        return WriteResponseSimple(200, "OK", "application/json",
-                                   response.c_str());
+                                   responseStr.c_str());
      }

      bool
--- a/llarp/CMakeLists.txt
+++ b/llarp/CMakeLists.txt
@ -35,6 +35,7 @@ set(LIB_UTIL_SRC
 add_library(${UTIL_LIB} STATIC ${LIB_UTIL_SRC})
 target_include_directories(${UTIL_LIB} PUBLIC ${CMAKE_CURRENT_SOURCE_DIR} ${PROJECT_SOURCE_DIR}/include)
 target_link_libraries(${UTIL_LIB} PUBLIC absl::synchronization)
+target_link_libraries(${UTIL_LIB} PUBLIC nlohmann_json::nlohmann_json)

 # cut back on fluff
 if (NOT WIN32)
--- a/llarp/constants/link_layer.hpp
+++ b/llarp/constants/link_layer.hpp
@ -5,5 +5,5 @@
 #include <stdlib.h>

 constexpr size_t MAX_LINK_MSG_SIZE                = 8192;
-constexpr llarp_time_t DefaultLinkSessionLifetime = 10 * 1000;
+constexpr llarp_time_t DefaultLinkSessionLifetime = 60 * 1000;
 #endif
--- a/llarp/path/pathbuilder.cpp
+++ b/llarp/path/pathbuilder.cpp
@ -210,7 +210,7 @@ namespace llarp
        return router->NumberOfConnectedRouters()
            && router->GetRandomConnectedRouter(cur);

-      size_t tries = 5;
+      size_t tries = 10;
      do
      {
        --tries;
@ -326,6 +326,7 @@ namespace llarp
    Builder::HandlePathBuilt(Path* p)
    {
      buildIntervalLimit = MIN_PATH_BUILD_INTERVAL;
+      router->routerProfiling().MarkPathSuccess(p);
      PathSet::HandlePathBuilt(p);
    }

@ -336,6 +337,7 @@ namespace llarp
      static constexpr llarp_time_t MaxBuildInterval = 30 * 1000;
      buildIntervalLimit =
          std::max(1000 + buildIntervalLimit, MaxBuildInterval);
+      router->routerProfiling().MarkPathFail(p);
      PathSet::HandlePathBuildTimeout(p);
    }

--- a/llarp/profiling.cpp
+++ b/llarp/profiling.cpp
@ -18,6 +18,8 @@ namespace llarp
      return false;
    if(!BEncodeWriteDictInt("t", connectTimeoutCount, buf))
      return false;
+    if(!BEncodeWriteDictInt("u", lastUpdated, buf))
+      return false;
    if(!BEncodeWriteDictInt("v", version, buf))
      return false;

@ -32,6 +34,8 @@ namespace llarp
      return false;
    if(!BEncodeMaybeReadDictInt("t", connectTimeoutCount, read, k, buf))
      return false;
+    if(!BEncodeMaybeReadDictInt("u", lastUpdated, read, k, buf))
+      return false;
    if(!BEncodeMaybeReadDictInt("v", version, read, k, buf))
      return false;
    if(!BEncodeMaybeReadDictInt("s", pathFailCount, read, k, buf))
@ -41,6 +45,28 @@ namespace llarp
    return read;
  }

+  void
+  RouterProfile::Clear()
+  {
+    connectGoodCount    = 0;
+    connectTimeoutCount = 0;
+    pathSuccessCount    = 0;
+    pathFailCount       = 0;
+    lastUpdated         = llarp::time_now_ms();
+  }
+
+  void
+  RouterProfile::Tick()
+  {
+    // 10 minutes
+    static constexpr llarp_time_t updateInterval = DEFAULT_PATH_LIFETIME;
+    auto now                                     = llarp::time_now_ms();
+    if(lastUpdated < now && now - lastUpdated > updateInterval)
+    {
+      Clear();
+    }
+  }
+
  bool
  RouterProfile::IsGood(uint64_t chances) const
  {
@ -59,11 +85,20 @@ namespace llarp
    return !itr->second.IsGood(chances);
  }

+  void
+  Profiling::Tick()
+  {
+    lock_t lock(m_ProfilesMutex);
+    std::for_each(m_Profiles.begin(), m_Profiles.end(),
+                  [](auto& item) { item.second.Tick(); });
+  }
+
  void
  Profiling::MarkTimeout(const RouterID& r)
  {
    lock_t lock(&m_ProfilesMutex);
    m_Profiles[r].connectTimeoutCount += 1;
+    m_Profiles[r].lastUpdated = llarp::time_now_ms();
  }

  void
@ -71,6 +106,7 @@ namespace llarp
  {
    lock_t lock(&m_ProfilesMutex);
    m_Profiles[r].connectGoodCount += 1;
+    m_Profiles[r].lastUpdated = llarp::time_now_ms();
  }

  void
@ -81,6 +117,7 @@ namespace llarp
    {
      // TODO: also mark bad?
      m_Profiles[hop.rc.pubkey].pathFailCount += 1;
+      m_Profiles[hop.rc.pubkey].lastUpdated = llarp::time_now_ms();
    }
  }

@ -91,6 +128,7 @@ namespace llarp
    for(const auto& hop : p->hops)
    {
      m_Profiles[hop.rc.pubkey].pathSuccessCount += 1;
+      m_Profiles[hop.rc.pubkey].lastUpdated = llarp::time_now_ms();
    }
  }

--- a/llarp/profiling.hpp
+++ b/llarp/profiling.hpp
@ -18,6 +18,7 @@ namespace llarp
    uint64_t connectGoodCount       = 0;
    uint64_t pathSuccessCount       = 0;
    uint64_t pathFailCount          = 0;
+    llarp_time_t lastUpdated        = 0;

    RouterProfile() : IBEncodeMessage(){};

@ -31,6 +32,14 @@ namespace llarp

    bool
    IsGood(uint64_t chances) const;
+
+    /// clear stats
+    void
+    Clear();
+
+    // rotate stats if timeout reached
+    void
+    Tick();
  };

  struct Profiling final : public IBEncodeMessage
@ -59,6 +68,9 @@ namespace llarp
    void
    MarkPathSuccess(path::Path* p) LOCKS_EXCLUDED(m_ProfilesMutex);

+    void
+    Tick();
+
    bool
    BEncode(llarp_buffer_t* buf) const override LOCKS_EXCLUDED(m_ProfilesMutex);

--- a/llarp/router/router.cpp
+++ b/llarp/router/router.cpp
@ -1022,6 +1022,8 @@ namespace llarp
    // LogDebug("tick router");
    auto now = Now();

+    routerProfiling().Tick();
+
    if(_rc.ExpiresSoon(now, randint() % 10000))
    {
      LogInfo("regenerating RC");
--- a/llarp/rpc/rpc.cpp
+++ b/llarp/rpc/rpc.cpp
@ -25,23 +25,28 @@ namespace llarp
      }

      virtual bool
-      HandleJSONResult(const json::Value& val) = 0;
+      HandleJSONResult(const nlohmann::json& val) = 0;

      bool
      HandleResponse(::abyss::http::RPC_Response response)
      {
-        if(!response.IsObject())
+        if(!response.is_object())
        {
          return HandleJSONResult({});
        }
-        const auto itr = response.FindMember("result");
-        if(itr == response.MemberEnd())
+        const auto itr = response.find("result");
+        if(itr == response.end())
        {
          return HandleJSONResult({});
        }
-        if(itr->value.IsObject())
-          return HandleJSONResult(itr->value);
-        return false;
+        else if(itr.value().is_object())
+        {
+          return HandleJSONResult(itr.value());
+        }
+        else
+        {
+          return false;
+        }
      }

      void
@ -65,42 +70,40 @@ namespace llarp
      }

      bool
-      HandleJSONResult(const json::Value& result) override
+      HandleJSONResult(const nlohmann::json& result) override
      {
        PubkeyList_t keys;
-        if(!result.IsObject())
+        if(!result.is_object())
        {
          LogWarn("Invalid result: not an object");
          handler({}, false);
          return false;
        }
-        const auto itr = result.FindMember("keys");
-        if(itr == result.MemberEnd())
+        const auto itr = result.find("keys");
+        if(itr == result.end())
        {
          LogWarn("Invalid result: no keys member");
          handler({}, false);
          return false;
        }
-        if(!itr->value.IsArray())
+        if(!itr.value().is_array())
        {
          LogWarn("Invalid result: keys is not an array");
          handler({}, false);
          return false;
        }
-        auto key_itr = itr->value.Begin();
-        while(key_itr != itr->value.End())
+        for(const auto item : itr.value())
        {
-          if(key_itr->IsString())
+          if(item.is_string())
          {
            keys.emplace_back();
-            std::string str = key_itr->GetString();
+            std::string str = item.get< std::string >();
            if(!Base32Decode(str, keys.back()))
            {
              LogWarn("Invalid key: ", str);
              keys.pop_back();
            }
          }
-          ++key_itr;
        }
        handler(keys, true);
        return true;
@ -149,9 +152,7 @@ namespace llarp
      AsyncUpdatePubkeyList()
      {
        LogInfo("Updating service node list");
-        json::Value params;
-        params.SetObject();
-        QueueRPC("get_all_service_nodes_keys", std::move(params),
+        QueueRPC("get_all_service_nodes_keys", nlohmann::json::object(),
                 std::bind(&CallerImpl::NewAsyncUpdatePubkeyListConn, this,
                           std::placeholders::_1));
      }
@ -211,75 +212,59 @@ namespace llarp
      {
      }

-      bool
-      DumpState(Response& resp) const
+      Response
+      DumpState() const
      {
        util::StatusObject dump = router->ExtractStatus();
-        dump.Impl.Accept(resp);
-        return true;
+        return dump.get();
      }

-      bool
-      ListExitLevels(Response& resp) const
+      Response
+      ListExitLevels() const
      {
        exit::Context::TrafficStats stats;
        router->exitContext().CalculateExitTraffic(stats);
-        resp.StartArray();
-        auto itr = stats.begin();
-        while(itr != stats.end())
+        Response resp;
+
+        for(const auto& stat : stats)
        {
-          resp.StartObject();
-          resp.Key("ident");
-          resp.String(itr->first.ToHex().c_str());
-          resp.Key("tx");
-          resp.Uint64(itr->second.first);
-          resp.Key("rx");
-          resp.Uint64(itr->second.second);
-          resp.EndObject();
-          ++itr;
+          resp.emplace_back(Response{
+              {"ident", stat.first.ToHex()},
+              {"tx", stat.second.first},
+              {"rx", stat.second.second},
+          });
        }
-        resp.EndArray();
-        return true;
+        return resp;
      }

-      bool
-      ListNeighboors(Response& resp) const
+      Response
+      ListNeighboors() const
      {
-        resp.StartArray();
+        Response resp = Response::array();
        router->ForEachPeer([&](const ILinkSession* session, bool outbound) {
-          resp.StartObject();
-          auto ident = RouterID(session->GetPubKey()).ToString();
-          resp.Key("ident");
-          resp.String(ident.c_str());
-
-          auto addr = session->GetRemoteEndpoint().ToString();
-          resp.Key("addr");
-          resp.String(addr.c_str());
-
-          resp.Key("outbound");
-          resp.Bool(outbound);
-          resp.EndObject();
+          resp.emplace_back(
+              Response{{"ident", RouterID(session->GetPubKey()).ToString()},
+                       {"addr", session->GetRemoteEndpoint().ToString()},
+                       {"outbound", outbound}});
        });
-        resp.EndArray();
-        return true;
+        return resp;
      }

-      bool
+      absl::optional< Response >
      HandleJSONRPC(Method_t method,
-                    __attribute__((unused)) const Params& params,
-                    Response& response)
+                    __attribute__((unused)) const Params& params)
      {
        if(method == "llarp.admin.link.neighboors")
        {
-          return ListNeighboors(response);
+          return ListNeighboors();
        }
        else if(method == "llarp.admin.exit.list")
        {
-          return ListExitLevels(response);
+          return ListExitLevels();
        }
        else if(method == "llarp.admin.dumpstate")
        {
-          return DumpState(response);
+          return DumpState();
        }
        return false;
      }
--- a/llarp/util/json.cpp
+++ b/llarp/util/json.cpp
@ -9,10 +9,12 @@ namespace llarp
 {
  namespace json
  {
-    struct RapidJSONParser : public IParser
+    struct NlohmannJSONParser : public IParser
    {
-      RapidJSONParser(size_t contentSize) : m_Buf(contentSize + 1), m_Offset(0)
+      NlohmannJSONParser(size_t contentSize)
+          : m_Buf(contentSize + 1), m_Offset(0)
      {
+        assert(contentSize != 0);
      }

      std::vector< char > m_Buf;
@ -23,36 +25,34 @@ namespace llarp
      {
        if(m_Offset + sz > m_Buf.size() - 1)
          return false;
-        memcpy(m_Buf.data() + m_Offset, buf, sz);
+        std::copy(buf, buf + sz, m_Buf.begin());
        m_Offset += sz;
        m_Buf[m_Offset] = 0;
        return true;
      }

      Result
-      Parse(Document& obj) const
+      Parse(nlohmann::json& obj) const
      {
        if(m_Offset < m_Buf.size() - 1)
          return eNeedData;
-        obj.Parse(m_Buf.data());
-        if(obj.HasParseError())
+
+        try
+        {
+          obj = nlohmann::json::parse(m_Buf.data());
+          return eDone;
+        }
+        catch(const nlohmann::json::exception&)
+        {
          return eParseError;
-        return eDone;
+        }
      }
    };

    IParser*
    MakeParser(size_t contentSize)
    {
-      return new RapidJSONParser(contentSize);
-    }
-
-    void
-    ToString(const json::Document& val, std::ostream& out)
-    {
-      Stream s(out);
-      rapidjson::Writer< Stream > writer(s);
-      val.Accept(writer);
+      return new NlohmannJSONParser(contentSize);
    }

  }  // namespace json
--- a/llarp/util/json.hpp
+++ b/llarp/util/json.hpp
@ -3,84 +3,13 @@

 #include <util/string_view.hpp>

-#include <rapidjson/document.h>
-#include <rapidjson/writer.h>
+#include <nlohmann/json.hpp>

 #include <memory>
 #include <iostream>

 namespace llarp
 {
-  namespace json
-  {
-    /// add this because debian stable doesn't have it
-    template < typename StreamType >
-    class BasicOStreamWrapper
-    {
-     public:
-      typedef typename StreamType::char_type Ch;
-      BasicOStreamWrapper(StreamType& stream) : stream_(stream)
-      {
-      }
-
-      void
-      Put(Ch c)
-      {
-        stream_.put(c);
-      }
-
-      void
-      Flush()
-      {
-        stream_.flush();
-      }
-
-      // Not implemented
-      char
-      Peek() const
-      {
-        RAPIDJSON_ASSERT(false);
-        return 0;
-      }
-      char
-      Take()
-      {
-        RAPIDJSON_ASSERT(false);
-        return 0;
-      }
-      size_t
-      Tell() const
-      {
-        RAPIDJSON_ASSERT(false);
-        return 0;
-      }
-      char*
-      PutBegin()
-      {
-        RAPIDJSON_ASSERT(false);
-        return 0;
-      }
-      size_t
-      PutEnd(char*)
-      {
-        RAPIDJSON_ASSERT(false);
-        return 0;
-      }
-
-     private:
-      BasicOStreamWrapper(const BasicOStreamWrapper&);
-      BasicOStreamWrapper&
-      operator=(const BasicOStreamWrapper&);
-
-      StreamType& stream_;
-    };
-
-    using Document = rapidjson::Document;
-    using Value    = rapidjson::Value;
-    using Stream   = BasicOStreamWrapper< std::ostream >;
-    using Writer   = rapidjson::Writer< Stream >;
-  }  // namespace json
-
  namespace json
  {
    struct IParser
@ -103,16 +32,13 @@ namespace llarp
      FeedData(const char* buf, size_t sz) = 0;
      /// parse internal buffer
      virtual Result
-      Parse(Document& obj) const = 0;
+      Parse(nlohmann::json& obj) const = 0;
    };

    /// create new parser
    IParser*
    MakeParser(size_t contentSize);

-    void
-    ToString(const json::Document& obj, std::ostream& out);
-
  }  // namespace json
 }  // namespace llarp

--- a/llarp/util/status.cpp
+++ b/llarp/util/status.cpp
@ -1,21 +1,54 @@
 #include <util/status.hpp>

+#include <util/traits.hpp>
+
 namespace llarp
 {
  namespace util
  {
-    StatusObject::StatusObject(const StatusObject& other)
+    struct StatusVisitor
    {
-      Impl.SetObject();
-      auto& a = Impl.GetAllocator();
-      Impl.CopyFrom(other.Impl, a);
-    }
-
-    StatusObject::~StatusObject()
-    {
-      Impl.RemoveAllMembers();
-    }
+      std::string name;
+      std::reference_wrapper< nlohmann::json > data;

+      StatusVisitor(StatusObject::String_t n, nlohmann::json& d)
+          : name(n), data(d)
+      {
+      }
+      void
+      operator()(uint64_t val)
+      {
+        data.get()[name] = val;
+      }
+      void
+      operator()(const std::string& val)
+      {
+        data.get()[name] = val;
+      }
+      void
+      operator()(bool val)
+      {
+        data.get()[name] = val;
+      }
+      void
+      operator()(const StatusObject& obj)
+      {
+        data.get()[name] = obj.Impl;
+      }
+      void
+      operator()(const std::vector< std::string >& val)
+      {
+        data.get()[name] = val;
+      }
+      void
+      operator()(const std::vector< StatusObject >& val)
+      {
+        auto arr = nlohmann::json::array();
+        std::transform(val.begin(), val.end(), std::back_inserter(arr),
+                       [](const auto& x) { return x.Impl; });
+        data.get()[name] = arr;
+      }
+    };
    void
    StatusObject::Put(const value_type& val)
    {
@ -23,99 +56,9 @@ namespace llarp
    }

    void
-    StatusObject::Put(String_t name, const Variant& val)
+    StatusObject::Put(String_t name, const Variant& data)
    {
-      if(absl::holds_alternative< uint64_t >(val))
-        PutInt(name, absl::get< uint64_t >(val));
-      else if(absl::holds_alternative< std::string >(val))
-        PutString(name, absl::get< std::string >(val));
-      else if(absl::holds_alternative< bool >(val))
-        PutBool(name, absl::get< bool >(val));
-      else if(absl::holds_alternative< StatusObject >(val))
-        PutObject(name, absl::get< StatusObject >(val));
-      else if(absl::holds_alternative< std::vector< std::string > >(val))
-        PutStringArray(name, absl::get< std::vector< std::string > >(val));
-      else if(absl::holds_alternative< std::vector< StatusObject > >(val))
-        PutObjectArray(name, absl::get< std::vector< StatusObject > >(val));
-    }
-
-    void
-    StatusObject::PutBool(String_t name, bool val)
-    {
-      auto& a = Impl.GetAllocator();
-      Value_t v;
-      v.SetBool(val);
-      auto s = llarp::string_view_string(name);
-      Value_t k(s.c_str(), a);
-      Impl.AddMember(k, v, a);
-    }
-
-    void
-    StatusObject::PutInt(String_t name, uint64_t val)
-    {
-      auto& a = Impl.GetAllocator();
-      Value_t v;
-      v.SetUint64(val);
-      auto s = llarp::string_view_string(name);
-      Value_t k(s.c_str(), a);
-      Impl.AddMember(k, v, a);
-    }
-
-    void
-    StatusObject::PutObject(String_t name, const StatusObject& val)
-    {
-      auto& a = Impl.GetAllocator();
-      Value_t v;
-      v.SetObject();
-      v.CopyFrom(val.Impl, a);
-      auto s = llarp::string_view_string(name);
-      Value_t k(s.c_str(), a);
-      Impl.AddMember(k, v, a);
-    }
-
-    void
-    StatusObject::PutObjectArray(String_t name,
-                                 const std::vector< StatusObject >& arr)
-    {
-      auto& a = Impl.GetAllocator();
-      Value_t v;
-      v.SetArray();
-      Value_t i;
-      for(const auto& obj : arr)
-      {
-        v.PushBack(i.SetObject().CopyFrom(obj.Impl, a), a);
-      }
-      auto s = llarp::string_view_string(name);
-      Value_t k(s.c_str(), a);
-      Impl.AddMember(k, v, a);
-    }
-
-    void
-    StatusObject::PutStringArray(String_t name,
-                                 const std::vector< std::string >& arr)
-    {
-      auto& a = Impl.GetAllocator();
-      Value_t v;
-      v.SetArray();
-      Value_t i;
-      for(const auto& str : arr)
-      {
-        v.PushBack(i.SetString(str.c_str(), a), a);
-      }
-      auto s = llarp::string_view_string(name);
-      Value_t k(s.c_str(), a);
-      Impl.AddMember(k, v, a);
-    }
-
-    void
-    StatusObject::PutString(String_t name, const std::string& val)
-    {
-      auto& a = Impl.GetAllocator();
-      Value_t v;
-      v.SetString(val.c_str(), a);
-      auto s = llarp::string_view_string(name);
-      Value_t k(s.c_str(), a);
-      Impl.AddMember(k, v, a);
+      absl::visit(StatusVisitor{name, Impl}, data);
    }
  }  // namespace util
 }  // namespace llarp
--- a/llarp/util/status.hpp
+++ b/llarp/util/status.hpp
@ -1,9 +1,10 @@
 #ifndef LLARP_UTIL_STATUS_HPP
 #define LLARP_UTIL_STATUS_HPP

-#include <util/json.hpp>
 #include <util/string_view.hpp>

+#include <nlohmann/json.hpp>
+
 #include <vector>
 #include <string>
 #include <algorithm>
@ -13,23 +14,17 @@ namespace llarp
 {
  namespace util
  {
-    using StatusObject_Impl = json::Document;
-    using Value_t           = json::Value;
-
+    struct StatusVisitor;
    struct StatusObject
    {
      using String_t = string_view;
      using Variant  = absl::variant< uint64_t, std::string, bool, StatusObject,
                                     std::vector< std::string >,
                                     std::vector< StatusObject > >;
-      using value_type = std::tuple< String_t, Variant >;
-
-      StatusObject(const StatusObject&);
-      ~StatusObject();
+      using value_type = std::pair< String_t, Variant >;

      StatusObject(std::initializer_list< value_type > vals)
      {
-        Impl.SetObject();
        std::for_each(vals.begin(), vals.end(),
                      [&](const value_type& item) { Put(item); });
      }
@ -40,21 +35,15 @@ namespace llarp
      void
      Put(const value_type& value);

-      StatusObject_Impl Impl;
+      nlohmann::json
+      get() const
+      {
+        return Impl;
+      }

     private:
-      void
-      PutBool(String_t name, bool val);
-      void
-      PutInt(String_t name, uint64_t val);
-      void
-      PutObject(String_t name, const StatusObject& val);
-      void
-      PutObjectArray(String_t name, const std::vector< StatusObject >& arr);
-      void
-      PutStringArray(String_t name, const std::vector< std::string >& arr);
-      void
-      PutString(String_t name, const std::string& val);
+      friend struct StatusVisitor;
+      nlohmann::json Impl;
    };

    /// an entity that has a status that can be extracted
--- a/readme.md
+++ b/readme.md
@ -15,14 +15,13 @@ Build requirements:
 * GNU Make
 * CMake
 * C++ 17 capable C++ compiler
-* rapidjson (if enabling jsonrpc server)
 * gcovr (if generating test coverage with gcc)

 ### Linux

 build:

-    $ sudo apt install build-essential cmake git libcap-dev wget rapidjson-dev
+    $ sudo apt install build-essential cmake git libcap-dev wget
    $ git clone https://github.com/loki-project/loki-network
    $ cd loki-network
    $ make -j8
@ -49,7 +48,7 @@ install (root):

 build (where `$ARCH` is your platform - `i686` or `x86_64`):

-    $ pacman -Sy base-devel mingw-w64-$ARCH-toolchain git libtool autoconf mingw-w64-$ARCH-cmake mingw-w64-$ARCH-rapidjson
+    $ pacman -Sy base-devel mingw-w64-$ARCH-toolchain git libtool autoconf mingw-w64-$ARCH-cmake
    $ git clone https://github.com/loki-project/loki-network.git
    $ cd loki-network
    $ mkdir -p build; cd build
--- a/test/link/test_llarp_link.cpp
+++ b/test/link/test_llarp_link.cpp
@ -189,7 +189,7 @@ TEST_F(LinkLayerTest, TestUTPAliceRenegWithBob)
          return true;
        }
      },
-      [&](llarp::ILinkSession * s) -> bool {
+      [&](llarp::ILinkSession* s) -> bool {
        const auto rc = s->GetRemoteRC();
        return rc.pubkey == Bob.GetRC().pubkey;
      },
@ -228,12 +228,12 @@ TEST_F(LinkLayerTest, TestUTPAliceRenegWithBob)
        Bob.gotLIM = true;
        return sendDiscardMessage(s);
      },
-      [&](llarp::ILinkSession * s) -> bool {
+      [&](llarp::ILinkSession* s) -> bool {
        if(s->GetRemoteRC().pubkey != Alice.GetRC().pubkey)
          return false;
        llarp::LogInfo("bob established with alice");
        return Bob.link->VisitSessionByPubkey(Alice.GetRC().pubkey.as_array(),
-                                       sendDiscardMessage);
+                                              sendDiscardMessage);
      },
      [&](llarp::RouterContact newrc, llarp::RouterContact oldrc) -> bool {
        success = newrc.pubkey == oldrc.pubkey;
@ -262,10 +262,21 @@ TEST_F(LinkLayerTest, TestUTPAliceConnectToBob)
  Alice.link = llarp::utp::NewServer(
      &crypto, Alice.encryptionKey,
      [&]() -> const llarp::RouterContact& { return Alice.GetRC(); },
-      [&](llarp::ILinkSession*, const llarp_buffer_t& buf) -> bool {
+      [&](llarp::ILinkSession* s, const llarp_buffer_t& buf) -> bool {
+        llarp::LinkIntroMessage lim;
+        llarp_buffer_t copy(buf.base, buf.sz);
+        if(lim.BDecode(&copy))
+        {
+          if(s->GotLIM(&lim))
+          {
+            Alice.gotLIM = true;
+            return true;
+          }
+          return false;
+        }
        return AliceGotMessage(buf);
      },
-      [&](llarp::ILinkSession * s) -> bool {
+      [&](llarp::ILinkSession* s) -> bool {
        if(s->GetRemoteRC().pubkey != Bob.GetRC().pubkey)
          return false;
        llarp::LogInfo("alice established with bob");
@ -284,24 +295,36 @@ TEST_F(LinkLayerTest, TestUTPAliceConnectToBob)
  Bob.link = llarp::utp::NewServer(
      &crypto, Bob.encryptionKey,
      [&]() -> const llarp::RouterContact& { return Bob.GetRC(); },
-      [&](llarp::ILinkSession*, const llarp_buffer_t& ) -> bool {
+      [&](llarp::ILinkSession* s, const llarp_buffer_t& buf) -> bool {
+        llarp::LinkIntroMessage lim;
+        llarp_buffer_t copy(buf.base, buf.sz);
+        if(lim.BDecode(&copy))
+        {
+          if(s->GotLIM(&lim))
+          {
+            Bob.gotLIM = true;
+            return true;
+          }
+          return false;
+        }
        return true;
      },
-      [&](llarp::ILinkSession * s) -> bool {
+      [&](llarp::ILinkSession* s) -> bool {
        if(s->GetRemoteRC().pubkey != Alice.GetRC().pubkey)
          return false;
        llarp::LogInfo("bob established with alice");
-        logic->queue_job({s, [](void * u) {
-          llarp::ILinkSession * self = static_cast<llarp::ILinkSession*>(u);
-          std::array< byte_t, 32 > tmp;
-          llarp_buffer_t otherBuf(tmp);
-          llarp::DiscardMessage discard;
-          if(!discard.BEncode(&otherBuf))
-            return;
-          otherBuf.sz  = otherBuf.cur - otherBuf.base;
-          otherBuf.cur = otherBuf.base;
-          self->SendMessageBuffer(otherBuf);
-        }});
+        logic->queue_job({s, [](void* u) {
+                            llarp::ILinkSession* self =
+                                static_cast< llarp::ILinkSession* >(u);
+                            std::array< byte_t, 32 > tmp;
+                            llarp_buffer_t otherBuf(tmp);
+                            llarp::DiscardMessage discard;
+                            if(!discard.BEncode(&otherBuf))
+                              return;
+                            otherBuf.sz  = otherBuf.cur - otherBuf.base;
+                            otherBuf.cur = otherBuf.base;
+                            self->SendMessageBuffer(otherBuf);
+                          }});
        return true;
      },
      [&](llarp::RouterContact, llarp::RouterContact) -> bool { return true; },
--- a/test/test_libabyss.cpp
+++ b/test/test_libabyss.cpp
@ -110,7 +110,7 @@ struct ClientHandler : public abyss::http::IRPCClientHandler
  void
  HandleError()
  {
-    ASSERT_TRUE(false);
+    FAIL() << "unexpected error";
  }

  void
@ -134,15 +134,12 @@ struct ServerHandler : public abyss::httpd::IRPCHandler
  {
  }

-  bool
-  HandleJSONRPC(Method_t method, __attribute__((unused)) const Params& params,
-                Response& response)
+  absl::optional< Response >
+  HandleJSONRPC(Method_t method, __attribute__((unused)) const Params& params)
  {
    test->AssertMethod(method);
    test->called = true;
-    response.StartObject();
-    response.EndObject();
-    return true;
+    return Response();
  }
 };

@ -200,9 +197,7 @@ struct AbyssTest : public AbyssTestBase,
 TEST_F(AbyssTest, TestClientAndServer)
 {
  Start();
-  llarp::json::Value params;
-  params.SetObject();
-  QueueRPC(method, std::move(params),
+  QueueRPC(method, nlohmann::json::object(),
           std::bind(&AbyssTest::NewConn, this, std::placeholders::_1));

  AsyncFlush();
--- a/vendor/nlohmann/.github/CONTRIBUTING.md
+++ b/vendor/nlohmann/.github/CONTRIBUTING.md
@ -0,0 +1,71 @@
+[![Issue Stats](http://issuestats.com/github/nlohmann/json/badge/pr?style=flat)](http://issuestats.com/github/nlohmann/json) [![Issue Stats](http://issuestats.com/github/nlohmann/json/badge/issue?style=flat)](http://issuestats.com/github/nlohmann/json)
+
+# How to contribute
+
+This project started as a little excuse to exercise some of the cool new C++11 features. Over time, people actually started to use the JSON library (yey!) and started to help improve it by proposing features, finding bugs, or even fixing my mistakes. I am really [thankful](https://github.com/nlohmann/json/blob/master/README.md#thanks) for this and try to keep track of all the helpers.
+
+To make it as easy as possible for you to contribute and for me to keep an overview, here are a few guidelines which should help us avoid all kinds of unnecessary work or disappointment. And of course, this document is subject to discussion, so please [create an issue](https://github.com/nlohmann/json/issues/new) or a pull request if you find a way to improve it!
+
+## Private reports
+
+Usually, all issues are tracked publicly on [GitHub](https://github.com/nlohmann/json/issues). If you want to make a private report (e.g., for a vulnerability or to attach an example that is not meant to be published), please send an email to <mail@nlohmann.me>.
+
+## Prerequisites
+
+Please [create an issue](https://github.com/nlohmann/json/issues/new), assuming one does not already exist, and describe your concern. Note you need a [GitHub account](https://github.com/signup/free) for this.
+
+## Describe your issue
+
+Clearly describe the issue:
+
+- If it is a bug, please describe how to **reproduce** it. If possible, attach a complete example which demonstrates the error. Please also state what you **expected** to happen instead of the error.
+- If you propose a change or addition, try to give an **example** how the improved code could look like or how to use it.
+- If you found a compilation error, please tell us which **compiler** (version and operating system) you used and paste the (relevant part of) the error messages to the ticket.
+
+Please stick to the [issue template](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE.md) if possible.
+
+## Files to change
+
+:exclamation: Before you make any changes, note the single-header file [`single_include/nlohmann/json.hpp`](https://github.com/nlohmann/json/blob/develop/single_include/nlohmann/json.hpp) is **generated** from the source files in the [`include/nlohmann` directory](https://github.com/nlohmann/json/tree/develop/include/nlohmann). Please **do not** edit file `single_include/nlohmann/json.hpp` directly, but change the `include/nlohmann` sources and regenerate file `single_include/nlohmann/json.hpp` by executing `make amalgamate`.
+
+To make changes, you need to edit the following files:
+
+1. [`include/nlohmann/*`](https://github.com/nlohmann/json/tree/develop/include/nlohmann) - These files are the sources of the library. Before testing or creating a pull request, execute `make amalgamate` to regenerate `single_include/nlohmann/json.hpp`.
+
+2. [`test/src/unit-*.cpp`](https://github.com/nlohmann/json/tree/develop/test/src) - These files contain the [Catch](https://github.com/philsquared/Catch) unit tests which currently cover [100 %](https://coveralls.io/github/nlohmann/json) of the library's code.
+
+   If you add or change a feature, please also add a unit test to this file. The unit tests can be compiled and executed with
+
+   ```sh
+   $ mkdir build
+   $ cd build
+   $ cmake ..
+   $ cmake --build .
+   $ ctest
+   ```
+
+   The test cases are also executed with several different compilers on [Travis](https://travis-ci.org/nlohmann/json) once you open a pull request.
+
+
+## Note
+
+- If you open a pull request, the code will be automatically tested with [Valgrind](http://valgrind.org)'s Memcheck tool to detect memory leaks. Please be aware that the execution with Valgrind _may_ in rare cases yield different behavior than running the code directly. This can result in failing unit tests which run successfully without Valgrind.
+- There is a Makefile target `make pretty` which runs [Artistic Style](http://astyle.sourceforge.net) to fix indentation. If possible, run it before opening the pull request. Otherwise, we shall run it afterward.
+
+## Please don't
+
+- The C++11 support varies between different **compilers** and versions. Please note the [list of supported compilers](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers). Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with `#ifdef`s or other means.
+- Specifically, I am aware of compilation problems with **Microsoft Visual Studio** (there even is an [issue label](https://github.com/nlohmann/json/issues?utf8=✓&q=label%3A%22visual+studio%22+) for these kind of bugs). I understand that even in 2016, complete C++11 support isn't there yet. But please also understand that I do not want to drop features or uglify the code just to make Microsoft's sub-standard compiler happy. The past has shown that there are ways to express the functionality such that the code compiles with the most recent MSVC - unfortunately, this is not the main objective of the project.
+- Please refrain from proposing changes that would **break [JSON](http://json.org) conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
+  - We shall not extend the library to **support comments**. There is quite some [controversy](https://www.reddit.com/r/programming/comments/4v6chu/why_json_doesnt_support_comments_douglas_crockford/) around this topic, and there were quite some [issues](https://github.com/nlohmann/json/issues/376) on this. We believe that JSON is fine without comments.
+  - We do not preserve the **insertion order of object elements**. The [JSON standard](https://tools.ietf.org/html/rfc7159.html) defines objects as "an unordered collection of zero or more name/value pairs". To this end, this library does not preserve insertion order of name/value pairs. (In fact, keys will be traversed in alphabetical order as `std::map` with `std::less` is used by default.) Note this behavior conforms to the standard, and we shall not change it to any other order. If you do want to preserve the insertion order, you can specialize the object type with containers like [`tsl::ordered_map`](https://github.com/Tessil/ordered-map) or [`nlohmann::fifo_map`](https://github.com/nlohmann/fifo_map).
+
+- Please do not open pull requests that address **multiple issues**.
+
+## Wanted
+
+The following areas really need contribution:
+
+- Extending the **continuous integration** toward more exotic compilers such as Android NDK, Intel's Compiler, or the bleeding-edge versions of GCC or Clang.
+- Improving the efficiency of the **JSON parser**. The current parser is implemented as a naive recursive descent parser with hand coded string handling. More sophisticated approaches like LALR parsers would be really appreciated. That said, parser generators like Bison or ANTLR do not play nice with single-header files -- I really would like to keep the parser inside the `json.hpp` header, and I am not aware of approaches similar to [`re2c`](http://re2c.org) for parsing.
+- Extending and updating existing **benchmarks** to include (the most recent version of) this library. Though efficiency is not everything, speed and memory consumption are very important characteristics for C++ developers, so having proper comparisons would be interesting.
--- a/vendor/nlohmann/.github/ISSUE_TEMPLATE/Bug_report.md
+++ b/vendor/nlohmann/.github/ISSUE_TEMPLATE/Bug_report.md
@ -0,0 +1,19 @@
+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+- What is the issue you have?
+
+- Please describe the steps to reproduce the issue. Can you provide a small but working code example?
+
+- What is the expected behavior?
+
+- And what is the actual behavior instead?
+
+- Which compiler and operating system are you using? Is it a [supported compiler](https://github.com/nlohmann/json#supported-compilers)?
+
+- Did you use a released version of the library or the version from the `develop` branch?
+
+- If you experience a compilation error: can you [compile and run the unit tests](https://github.com/nlohmann/json#execute-unit-tests)?
--- a/vendor/nlohmann/.github/ISSUE_TEMPLATE/Feature_request.md
+++ b/vendor/nlohmann/.github/ISSUE_TEMPLATE/Feature_request.md
@ -0,0 +1,9 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+- Describe the feature in as much detail as possible.
+
+- Include sample usage where appropriate.
--- a/vendor/nlohmann/.github/PULL_REQUEST_TEMPLATE.md
+++ b/vendor/nlohmann/.github/PULL_REQUEST_TEMPLATE.md
@ -0,0 +1,19 @@
+[Describe your pull request here. Please read the text below the line, and make sure you follow the checklist.]
+
+* * *
+
+## Pull request checklist
+
+Read the [Contribution Guidelines](https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md) for detailed information.
+
+- [ ]  Changes are described in the pull request, or an [existing issue is referenced](https://github.com/nlohmann/json/issues).
+- [ ]  The test suite [compiles and runs](https://github.com/nlohmann/json/blob/develop/README.md#execute-unit-tests) without error.
+- [ ]  [Code coverage](https://coveralls.io/github/nlohmann/json) is 100%. Test cases can be added by editing the [test suite](https://github.com/nlohmann/json/tree/develop/test/src).
+- [ ]  The source code is amalgamated; that is, after making changes to the sources in the `include/nlohmann` directory, run `make amalgamate` to create the single-header file `single_include/nlohmann/json.hpp`. The whole process is described [here](https://github.com/nlohmann/json/blob/develop/.github/CONTRIBUTING.md#files-to-change).
+
+## Please don't
+
+- The C++11 support varies between different **compilers** and versions. Please note the [list of supported compilers](https://github.com/nlohmann/json/blob/master/README.md#supported-compilers). Some compilers like GCC 4.7 (and earlier), Clang 3.3 (and earlier), or Microsoft Visual Studio 13.0 and earlier are known not to work due to missing or incomplete C++11 support. Please refrain from proposing changes that work around these compiler's limitations with `#ifdef`s or other means.
+- Specifically, I am aware of compilation problems with **Microsoft Visual Studio** (there even is an [issue label](https://github.com/nlohmann/json/issues?utf8=✓&q=label%3A%22visual+studio%22+) for these kind of bugs). I understand that even in 2016, complete C++11 support isn't there yet. But please also understand that I do not want to drop features or uglify the code just to make Microsoft's sub-standard compiler happy. The past has shown that there are ways to express the functionality such that the code compiles with the most recent MSVC - unfortunately, this is not the main objective of the project.
+- Please refrain from proposing changes that would **break [JSON](http://json.org) conformance**. If you propose a conformant extension of JSON to be supported by the library, please motivate this extension.
+- Please do not open pull requests that address **multiple issues**.
--- a/vendor/nlohmann/.github/config.yml
+++ b/vendor/nlohmann/.github/config.yml
@ -0,0 +1,19 @@
+# Configuration for sentiment-bot - https://github.com/behaviorbot/sentiment-bot
+
+# *Required* toxicity threshold between 0 and .99 with the higher numbers being the most toxic
+# Anything higher than this threshold will be marked as toxic and commented on
+sentimentBotToxicityThreshold: .7
+
+# *Required* Comment to reply with
+sentimentBotReplyComment: >
+  Please be sure to review the [code of conduct](https://github.com/nlohmann/json/blob/develop/CODE_OF_CONDUCT.md) and be respectful of other users. cc/ @nlohmann
+
+
+# Configuration for request-info - https://github.com/behaviorbot/request-info
+
+# *Required* Comment to reply with
+requestInfoReplyComment: >
+  We would appreciate it if you could provide us with more info about this issue or pull request! Please check the [issue template](https://github.com/nlohmann/json/blob/develop/.github/ISSUE_TEMPLATE.md) and the [pull request template](https://github.com/nlohmann/json/blob/develop/.github/PULL_REQUEST_TEMPLATE.md).
+
+# *OPTIONAL* Label to be added to Issues and Pull Requests with insufficient information given
+requestInfoLabelToAdd: "state: needs more info"
--- a/vendor/nlohmann/.github/stale.yml
+++ b/vendor/nlohmann/.github/stale.yml
@ -0,0 +1,17 @@
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 30
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - pinned
+  - security
+# Label to use when marking an issue as stale
+staleLabel: "state: stale"
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false
--- a/vendor/nlohmann/.gitignore
+++ b/vendor/nlohmann/.gitignore
@ -0,0 +1,25 @@
+json_unit
+json_benchmarks
+json_benchmarks_simple
+fuzz-testing
+
+*.dSYM
+*.o
+*.gcno
+*.gcda
+
+build
+build_coverage
+clang_analyze_build
+
+doc/xml
+doc/html
+me.nlohmann.json.docset
+
+benchmarks/files/numbers/*.json
+
+.idea
+cmake-build-debug
+
+test/test-*
+/.vs
--- a/vendor/nlohmann/.travis.yml
+++ b/vendor/nlohmann/.travis.yml
@ -0,0 +1,338 @@
+#########################
+# project configuration #
+#########################
+
+# C++ project
+language: cpp
+
+dist: trusty
+sudo: required
+group: edge
+
+
+###################
+# global settings #
+###################
+
+env:
+  global:
+   # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
+   #   via the "travis encrypt" command using the project repo's public key
+   - secure: "m89SSgE+ASLO38rSKx7MTXK3n5NkP9bIx95jwY71YEiuFzib30PDJ/DifKnXxBjvy/AkCGztErQRk/8ZCvq+4HXozU2knEGnL/RUitvlwbhzfh2D4lmS3BvWBGS3N3NewoPBrRmdcvnT0xjOGXxtZaJ3P74TkB9GBnlz/HmKORA="
+
+
+################
+# build matrix #
+################
+
+matrix:
+  include:
+
+  # Valgrind
+  - os: linux
+    compiler: gcc
+    env:
+      - COMPILER=g++-4.9
+      - CMAKE_OPTIONS=-DJSON_Valgrind=ON
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-4.9', 'valgrind', 'ninja-build']
+
+  # clang sanitizer
+  - os: linux
+    compiler: clang
+    env:
+      - COMPILER=clang++-5.0
+      - CMAKE_OPTIONS=-DJSON_Sanitizer=ON
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
+        packages: ['g++-6', 'clang-5.0', 'ninja-build']
+
+  # cppcheck
+  - os: linux
+    compiler: gcc
+    env:
+      - COMPILER=g++-4.9
+      - SPECIAL=cppcheck
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-4.9', 'cppcheck', 'ninja-build']
+    after_success:
+      - make cppcheck
+
+  # no exceptions
+  - os: linux
+    compiler: gcc
+    env:
+      - COMPILER=g++-4.9
+      - CMAKE_OPTIONS=-DJSON_NoExceptions=ON
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-4.9', 'ninja-build']
+
+  # check amalgamation
+  - os: linux
+    compiler: gcc
+    env:
+      - COMPILER=g++-4.9
+      - SPECIAL=amalgamation
+      - MULTIPLE_HEADERS=ON
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-4.9', 'astyle', 'ninja-build']
+    after_success:
+      - make check-amalgamation
+
+  # Coveralls (http://gronlier.fr/blog/2015/01/adding-code-coverage-to-your-c-project/)
+
+  - os: linux
+    compiler: gcc
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-4.9', 'ninja-build']
+    before_script:
+      - pip install --user cpp-coveralls
+    after_success:
+      - coveralls --build-root test --include include/nlohmann --gcov 'gcov-4.9' --gcov-options '\-lp'
+    env:
+      - COMPILER=g++-4.9
+      - CMAKE_OPTIONS=-DJSON_Coverage=ON
+      - MULTIPLE_HEADERS=ON
+
+  # Coverity (only for branch coverity_scan)
+
+  - os: linux
+    compiler: clang
+    before_install: echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-certificates.crt
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
+        packages: ['g++-6', 'clang-3.6', 'ninja-build']
+      coverity_scan:
+        project:
+          name: "nlohmann/json"
+          description: "Build submitted via Travis CI"
+        notification_email: niels.lohmann@gmail.com
+        build_command_prepend: "mkdir coverity_build ; cd coverity_build ; cmake .. ; cd .."
+        build_command: "make -C coverity_build"
+        branch_pattern: coverity_scan
+    env:
+      - SPECIAL=coverity
+      - COMPILER=clang++-3.6
+
+  # OSX / Clang
+
+  - os: osx
+    osx_image: xcode6.4
+
+  - os: osx
+    osx_image: xcode7.3
+
+  - os: osx
+    osx_image: xcode8
+
+  - os: osx
+    osx_image: xcode8.1
+
+  - os: osx
+    osx_image: xcode8.2
+
+  - os: osx
+    osx_image: xcode8.3
+
+  - os: osx
+    osx_image: xcode9
+
+  - os: osx
+    osx_image: xcode9.1
+
+  - os: osx
+    osx_image: xcode9.2
+
+  - os: osx
+    osx_image: xcode9.3
+
+  - os: osx
+    osx_image: xcode9.4
+
+  - os: osx
+    osx_image: xcode10
+
+  # Linux / GCC
+
+  - os: linux
+    compiler: gcc
+    env: compiler=g++-4.8
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-4.8', 'ninja-build']
+
+  - os: linux
+    compiler: gcc
+    env: compiler=g++-4.9
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-4.9', 'ninja-build']
+
+  - os: linux
+    compiler: gcc
+    env: COMPILER=g++-5
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-5', 'ninja-build']
+
+  - os: linux
+    compiler: gcc
+    env: COMPILER=g++-6
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-6', 'ninja-build']
+
+  - os: linux
+    compiler: gcc
+    env: COMPILER=g++-7
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-7', 'ninja-build']
+
+  - os: linux
+    compiler: gcc
+    env: COMPILER=g++-8
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-8', 'ninja-build']
+
+  - os: linux
+    compiler: gcc
+    env:
+      - COMPILER=g++-8
+      - CXXFLAGS=-std=c++17
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-8', 'ninja-build']
+
+  # Linux / Clang
+
+  - os: linux
+    compiler: clang
+    env: COMPILER=clang++-3.5
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.5']
+        packages: ['g++-6', 'clang-3.5', 'ninja-build']
+
+  - os: linux
+    compiler: clang
+    env: COMPILER=clang++-3.6
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
+        packages: ['g++-6', 'clang-3.6', 'ninja-build']
+
+  - os: linux
+    compiler: clang
+    env: COMPILER=clang++-3.7
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.7']
+        packages: ['g++-6', 'clang-3.7', 'ninja-build']
+
+  - os: linux
+    compiler: clang
+    env: COMPILER=clang++-3.8
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-6', 'clang-3.8', 'ninja-build']
+
+  - os: linux
+    compiler: clang
+    env: COMPILER=clang++-3.9
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-6', 'clang-3.9', 'ninja-build']
+
+  - os: linux
+    compiler: clang
+    env: COMPILER=clang++-4.0
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-4.0']
+        packages: ['g++-6', 'clang-4.0', 'ninja-build']
+
+  - os: linux
+    compiler: clang
+    env: COMPILER=clang++-5.0
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
+        packages: ['g++-6', 'clang-5.0', 'ninja-build']
+
+  - os: linux
+    compiler: clang
+    env: COMPILER=clang++-6.0
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-6.0']
+        packages: ['g++-6', 'clang-6.0', 'ninja-build']
+
+  - os: linux
+    compiler: clang
+    env:
+      - COMPILER=clang++-6.0
+      - CXXFLAGS=-std=c++1z
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-6.0']
+        packages: ['g++-6', 'clang-6.0', 'ninja-build']
+
+################
+# build script #
+################
+
+script:
+  # get CMake and Ninja (only for systems with brew - macOS)
+  - |
+     if [[ (-x $(which brew)) ]]; then
+       brew update
+       brew install cmake ninja
+       brew upgrade cmake
+       cmake --version
+     fi
+
+  # make sure CXX is correctly set
+  - if [[ "${COMPILER}" != "" ]]; then export CXX=${COMPILER}; fi
+  # by default, use the single-header version
+  - if [[ "${MULTIPLE_HEADERS}" == "" ]]; then export MULTIPLE_HEADERS=OFF; fi
+
+  # show OS/compiler version
+  - uname -a
+  - $CXX --version
+
+  # compile and execute unit tests
+  - mkdir -p build && cd build
+  - cmake .. ${CMAKE_OPTIONS} -DJSON_MultipleHeaders=${MULTIPLE_HEADERS} -GNinja && cmake --build . --config Release
+  - ctest -C Release -V -j
+  - cd ..
+
+  # check if homebrew works (only checks develop branch)   
+  - if [ `which brew` ]; then   
+    brew update ;   
+    brew tap nlohmann/json ;    
+    brew install nlohmann_json --HEAD ;    
+    brew test nlohmann_json ;    
+    fi
--- a/vendor/nlohmann/CMakeLists.txt
+++ b/vendor/nlohmann/CMakeLists.txt
@ -0,0 +1,111 @@
+cmake_minimum_required(VERSION 3.7)
+
+##
+## PROJECT
+## name and version
+##
+project(nlohmann_json VERSION 3.5.0 LANGUAGES CXX)
+
+##
+## INCLUDE
+##
+##
+include(ExternalProject)
+
+##
+## OPTIONS
+##
+option(JSON_BuildTests "Build the unit tests when BUILD_TESTING is enabled." ON)
+option(JSON_MultipleHeaders "Use non-amalgamated version of the library." OFF)
+
+##
+## CONFIGURATION
+##
+set(NLOHMANN_JSON_TARGET_NAME               ${PROJECT_NAME})
+set(NLOHMANN_JSON_CONFIG_INSTALL_DIR        "lib/cmake/${PROJECT_NAME}"
+  CACHE INTERNAL "")
+set(NLOHMANN_JSON_INCLUDE_INSTALL_DIR       "include")
+set(NLOHMANN_JSON_TARGETS_EXPORT_NAME       "${PROJECT_NAME}Targets")
+set(NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE     "cmake/config.cmake.in")
+set(NLOHMANN_JSON_CMAKE_CONFIG_DIR          "${CMAKE_CURRENT_BINARY_DIR}")
+set(NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
+set(NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Config.cmake")
+set(NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE "${NLOHMANN_JSON_CMAKE_CONFIG_DIR}/${PROJECT_NAME}Targets.cmake")
+
+if (JSON_MultipleHeaders)
+    set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/include/")
+    message(STATUS "Using the multi-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
+else()
+    set(NLOHMANN_JSON_INCLUDE_BUILD_DIR "${PROJECT_SOURCE_DIR}/single_include/")
+    message(STATUS "Using the single-header code from ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}")
+endif()
+
+##
+## TARGET
+## create target and add include path
+##
+add_library(${NLOHMANN_JSON_TARGET_NAME} INTERFACE)
+add_library(${PROJECT_NAME}::${NLOHMANN_JSON_TARGET_NAME} ALIAS ${NLOHMANN_JSON_TARGET_NAME})
+
+target_include_directories(
+    ${NLOHMANN_JSON_TARGET_NAME}
+    INTERFACE
+    $<BUILD_INTERFACE:${NLOHMANN_JSON_INCLUDE_BUILD_DIR}>
+    $<INSTALL_INTERFACE:include>
+)
+
+## add debug view definition file for msvc (natvis)
+if (MSVC)
+    set(NLOHMANN_ADD_NATVIS TRUE)
+    set(NLOHMANN_NATVIS_FILE "nlohmann_json.natvis")
+    target_sources(
+        ${NLOHMANN_JSON_TARGET_NAME}
+        INTERFACE
+            $<INSTALL_INTERFACE:${NLOHMANN_NATVIS_FILE}>
+            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/${NLOHMANN_NATVIS_FILE}>
+    )
+endif()
+
+##
+## INSTALL
+## install header files, generate and install cmake config files for find_package()
+##
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(
+    ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE} COMPATIBILITY SameMajorVersion
+)
+configure_file(
+    ${NLOHMANN_JSON_CMAKE_CONFIG_TEMPLATE}
+    ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE}
+    @ONLY
+)
+
+#install(
+#    DIRECTORY ${NLOHMANN_JSON_INCLUDE_BUILD_DIR}
+#    DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
+#)
+#install(
+#    FILES ${NLOHMANN_JSON_CMAKE_PROJECT_CONFIG_FILE} ${NLOHMANN_JSON_CMAKE_VERSION_CONFIG_FILE}
+#    DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
+#)
+if (NLOHMANN_ADD_NATVIS)
+    #install(
+     #   FILES ${NLOHMANN_NATVIS_FILE}
+      #  DESTINATION .
+#)
+endif()
+export(
+    TARGETS ${NLOHMANN_JSON_TARGET_NAME}
+    NAMESPACE ${PROJECT_NAME}::
+    FILE ${NLOHMANN_JSON_CMAKE_PROJECT_TARGETS_FILE}
+)
+#install(
+#    TARGETS ${NLOHMANN_JSON_TARGET_NAME}
+    #EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
+    #INCLUDES DESTINATION ${NLOHMANN_JSON_INCLUDE_INSTALL_DIR}
+#)
+#install(
+    #EXPORT ${NLOHMANN_JSON_TARGETS_EXPORT_NAME}
+    #NAMESPACE ${PROJECT_NAME}::
+    #DESTINATION ${NLOHMANN_JSON_CONFIG_INSTALL_DIR}
+#)
--- a/vendor/nlohmann/CODE_OF_CONDUCT.md
+++ b/vendor/nlohmann/CODE_OF_CONDUCT.md
@ -0,0 +1,46 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at mail@nlohmann.me. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/
--- a/vendor/nlohmann/ChangeLog.md
+++ b/vendor/nlohmann/ChangeLog.md
--- a/vendor/nlohmann/LICENSE.MIT
+++ b/vendor/nlohmann/LICENSE.MIT
@ -0,0 +1,21 @@
+MIT License 
+
+Copyright (c) 2013-2018 Niels Lohmann
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/vendor/nlohmann/Makefile
+++ b/vendor/nlohmann/Makefile
@ -0,0 +1,347 @@
+.PHONY: pretty clean ChangeLog.md
+
+SRCS = include/nlohmann/json.hpp \
+       include/nlohmann/json_fwd.hpp \
+       include/nlohmann/adl_serializer.hpp \
+       include/nlohmann/detail/conversions/from_json.hpp \
+       include/nlohmann/detail/conversions/to_chars.hpp \
+       include/nlohmann/detail/conversions/to_json.hpp \
+       include/nlohmann/detail/exceptions.hpp \
+       include/nlohmann/detail/input/binary_reader.hpp \
+       include/nlohmann/detail/input/input_adapters.hpp \
+       include/nlohmann/detail/input/json_sax.hpp \
+       include/nlohmann/detail/input/lexer.hpp \
+       include/nlohmann/detail/input/parser.hpp \
+       include/nlohmann/detail/input/position_t.hpp \
+       include/nlohmann/detail/iterators/internal_iterator.hpp \
+       include/nlohmann/detail/iterators/iter_impl.hpp \
+       include/nlohmann/detail/iterators/iteration_proxy.hpp \
+       include/nlohmann/detail/iterators/json_reverse_iterator.hpp \
+       include/nlohmann/detail/iterators/primitive_iterator.hpp \
+       include/nlohmann/detail/json_pointer.hpp \
+       include/nlohmann/detail/json_ref.hpp \
+       include/nlohmann/detail/macro_scope.hpp \
+       include/nlohmann/detail/macro_unscope.hpp \
+       include/nlohmann/detail/meta/cpp_future.hpp \
+       include/nlohmann/detail/meta/detected.hpp \
+       include/nlohmann/detail/meta/type_traits.hpp \
+       include/nlohmann/detail/meta/void_t.hpp \
+       include/nlohmann/detail/output/binary_writer.hpp \
+       include/nlohmann/detail/output/output_adapters.hpp \
+       include/nlohmann/detail/output/serializer.hpp \
+       include/nlohmann/detail/value_t.hpp
+
+UNAME = $(shell uname)
+CXX=clang++
+
+AMALGAMATED_FILE=single_include/nlohmann/json.hpp
+
+# main target
+all:
+	@echo "amalgamate - amalgamate file single_include/nlohmann/json.hpp from the include/nlohmann sources"
+	@echo "ChangeLog.md - generate ChangeLog file"
+	@echo "check - compile and execute test suite"
+	@echo "check-amalgamation - check whether sources have been amalgamated"
+	@echo "check-fast - compile and execute test suite (skip long-running tests)"
+	@echo "clean - remove built files"
+	@echo "coverage - create coverage information with lcov"
+	@echo "cppcheck - analyze code with cppcheck"
+	@echo "doctest - compile example files and check their output"
+	@echo "fuzz_testing - prepare fuzz testing of the JSON parser"
+	@echo "fuzz_testing_bson - prepare fuzz testing of the BSON parser"
+	@echo "fuzz_testing_cbor - prepare fuzz testing of the CBOR parser"
+	@echo "fuzz_testing_msgpack - prepare fuzz testing of the MessagePack parser"
+	@echo "fuzz_testing_ubjson - prepare fuzz testing of the UBJSON parser"
+	@echo "json_unit - create single-file test executable"
+	@echo "pedantic_clang - run Clang with maximal warning flags"
+	@echo "pedantic_gcc - run GCC with maximal warning flags"
+	@echo "pretty - beautify code with Artistic Style"
+	@echo "run_benchmarks - build and run benchmarks"
+
+##########################################################################
+# unit tests
+##########################################################################
+
+# build unit tests
+json_unit:
+	@$(MAKE) json_unit -C test
+
+# run unit tests
+check:
+	$(MAKE) check -C test
+
+check-fast:
+	$(MAKE) check -C test TEST_PATTERN=""
+
+# clean up
+clean:
+	rm -fr json_unit json_benchmarks fuzz fuzz-testing *.dSYM test/*.dSYM
+	rm -fr benchmarks/files/numbers/*.json
+	rm -fr build_coverage build_benchmarks
+	$(MAKE) clean -Cdoc
+	$(MAKE) clean -Ctest
+
+
+##########################################################################
+# coverage
+##########################################################################
+
+coverage:
+	mkdir build_coverage
+	cd build_coverage ; CXX=g++-7 cmake .. -GNinja -DJSON_Coverage=ON -DJSON_MultipleHeaders=ON
+	cd build_coverage ; ninja
+	cd build_coverage ; ctest -E '.*_default' -j10
+	cd build_coverage ; ninja lcov_html
+	open build_coverage/test/html/index.html
+
+
+##########################################################################
+# documentation tests
+##########################################################################
+
+# compile example files and check output
+doctest:
+	$(MAKE) check_output -C doc
+
+
+##########################################################################
+# warning detector
+##########################################################################
+
+# calling Clang with all warnings, except:
+# -Wno-documentation-unknown-command: code uses user-defined commands like @complexity
+# -Wno-exit-time-destructors: warning in Catch code
+# -Wno-keyword-macro: unit-tests use "#define private public"
+# -Wno-deprecated-declarations: the library deprecated some functions
+# -Wno-weak-vtables: exception class is defined inline, but has virtual method
+# -Wno-range-loop-analysis: items tests "for(const auto i...)"
+# -Wno-float-equal: not all comparisons in the tests can be replaced by Approx
+# -Wno-switch-enum -Wno-covered-switch-default: pedantic/contradicting warnings about switches
+# -Wno-padded: padding is nothing to warn about
+pedantic_clang:
+	$(MAKE) json_unit CXXFLAGS="\
+		-std=c++11 -Wno-c++98-compat -Wno-c++98-compat-pedantic \
+		-Werror \
+		-Weverything \
+		-Wno-documentation-unknown-command \
+		-Wno-exit-time-destructors \
+		-Wno-keyword-macro \
+		-Wno-deprecated-declarations \
+		-Wno-weak-vtables \
+		-Wno-range-loop-analysis \
+		-Wno-float-equal \
+		-Wno-switch-enum -Wno-covered-switch-default \
+		-Wno-padded"
+
+# calling GCC with most warnings
+pedantic_gcc:
+	$(MAKE) json_unit CXXFLAGS="\
+		-std=c++11 \
+		-Wno-deprecated-declarations \
+		-Werror \
+		-Wall -Wpedantic -Wextra \
+		-Walloca \
+		-Warray-bounds=2 \
+		-Wcast-qual -Wcast-align \
+		-Wchar-subscripts \
+		-Wconditionally-supported \
+		-Wconversion \
+		-Wdate-time \
+		-Wdeprecated \
+		-Wdisabled-optimization \
+		-Wdouble-promotion \
+		-Wduplicated-branches \
+		-Wduplicated-cond \
+		-Wformat-overflow=2 \
+		-Wformat-signedness \
+		-Wformat-truncation=2 \
+		-Wformat=2 \
+		-Wno-ignored-qualifiers \
+		-Wimplicit-fallthrough=5 \
+		-Wlogical-op \
+		-Wmissing-declarations \
+		-Wmissing-format-attribute \
+		-Wmissing-include-dirs \
+		-Wnoexcept \
+		-Wnonnull \
+		-Wnull-dereference \
+		-Wold-style-cast \
+		-Woverloaded-virtual \
+		-Wparentheses \
+		-Wplacement-new=2 \
+		-Wredundant-decls \
+		-Wreorder \
+		-Wrestrict \
+		-Wshadow=global \
+		-Wshift-overflow=2 \
+		-Wsign-conversion \
+		-Wsign-promo \
+		-Wsized-deallocation \
+		-Wstrict-overflow=5 \
+		-Wsuggest-attribute=const \
+		-Wsuggest-attribute=format \
+		-Wsuggest-attribute=noreturn \
+		-Wsuggest-attribute=pure \
+		-Wsuggest-final-methods \
+		-Wsuggest-final-types \
+		-Wsuggest-override \
+		-Wtrigraphs \
+		-Wundef \
+		-Wuninitialized -Wunknown-pragmas \
+		-Wunused \
+		-Wunused-const-variable=2 \
+		-Wunused-macros \
+		-Wunused-parameter \
+		-Wuseless-cast \
+		-Wvariadic-macros \
+		-Wctor-dtor-privacy \
+		-Winit-self \
+		-Wstrict-null-sentinel"
+
+##########################################################################
+# benchmarks
+##########################################################################
+
+run_benchmarks:
+	mkdir build_benchmarks
+	cd build_benchmarks ; cmake ../benchmarks
+	cd build_benchmarks ; make
+	cd build_benchmarks ; ./json_benchmarks
+
+##########################################################################
+# fuzzing
+##########################################################################
+
+# the overall fuzz testing target
+fuzz_testing:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_afl_fuzzer -C test CXX=afl-clang++
+	mv test/parse_afl_fuzzer fuzz-testing/fuzzer
+	find test/data/json_tests -size -5k -name *json | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_bson:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_bson_fuzzer -C test CXX=afl-clang++
+	mv test/parse_bson_fuzzer fuzz-testing/fuzzer
+	find test/data -size -5k -name *.bson | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_cbor:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_cbor_fuzzer -C test CXX=afl-clang++
+	mv test/parse_cbor_fuzzer fuzz-testing/fuzzer
+	find test/data -size -5k -name *.cbor | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_msgpack:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_msgpack_fuzzer -C test CXX=afl-clang++
+	mv test/parse_msgpack_fuzzer fuzz-testing/fuzzer
+	find test/data -size -5k -name *.msgpack | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzz_testing_ubjson:
+	rm -fr fuzz-testing
+	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
+	$(MAKE) parse_ubjson_fuzzer -C test CXX=afl-clang++
+	mv test/parse_ubjson_fuzzer fuzz-testing/fuzzer
+	find test/data -size -5k -name *.ubjson | xargs -I{} cp "{}" fuzz-testing/testcases
+	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"
+
+fuzzing-start:
+	afl-fuzz -S fuzzer1 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer2 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer3 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer4 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer5 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer6 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -S fuzzer7 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer > /dev/null &
+	afl-fuzz -M fuzzer0 -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer
+
+fuzzing-stop:
+	-killall fuzzer
+	-killall afl-fuzz
+
+##########################################################################
+# static analyzer
+##########################################################################
+
+# call cppcheck on the main header file
+cppcheck:
+	cppcheck --enable=warning --inconclusive --force --std=c++11 $(AMALGAMATED_FILE) --error-exitcode=1
+
+# compile and check with Clang Static Analyzer
+clang_analyze:
+	rm -fr clang_analyze_build
+	mkdir clang_analyze_build
+	cd clang_analyze_build ; CCC_CXX=/Users/niels/Documents/projects/llvm-clang/local/bin/clang++ /Users/niels/Documents/projects/llvm-clang/local/bin/scan-build cmake ..
+	/Users/niels/Documents/projects/llvm-clang/local/bin/scan-build -enable-checker alpha.core.DynamicTypeChecker,alpha.core.PointerArithm,alpha.core.PointerSub,alpha.cplusplus.DeleteWithNonVirtualDtor,alpha.cplusplus.IteratorRange,alpha.cplusplus.MisusedMovedObject,alpha.security.ArrayBoundV2,alpha.core.Conversion --use-c++=/Users/niels/Documents/projects/llvm-clang/local/bin/clang++ --view -analyze-headers -o clang_analyze_build/report.html make -j10 -C clang_analyze_build
+
+##########################################################################
+# maintainer targets
+##########################################################################
+
+# pretty printer
+pretty:
+	astyle --style=allman --indent=spaces=4 --indent-modifiers \
+	   --indent-switches --indent-preproc-block --indent-preproc-define \
+	   --indent-col1-comments --pad-oper --pad-header --align-pointer=type \
+	   --align-reference=type --add-brackets --convert-tabs --close-templates \
+	   --lineend=linux --preserve-date --suffix=none --formatted \
+	   $(SRCS) $(AMALGAMATED_FILE) test/src/*.cpp \
+	   benchmarks/src/benchmarks.cpp doc/examples/*.cpp
+
+# create single header file
+amalgamate: $(AMALGAMATED_FILE)
+
+$(AMALGAMATED_FILE): $(SRCS)
+	third_party/amalgamate/amalgamate.py -c third_party/amalgamate/config.json -s . --verbose=yes
+	$(MAKE) pretty
+
+# check if single_include/nlohmann/json.hpp has been amalgamated from the nlohmann sources
+check-amalgamation:
+	@mv $(AMALGAMATED_FILE) $(AMALGAMATED_FILE)~
+	@$(MAKE) amalgamate
+	@diff $(AMALGAMATED_FILE) $(AMALGAMATED_FILE)~ || (echo "===================================================================\n  Amalgamation required! Please read the contribution guidelines\n  in file .github/CONTRIBUTING.md.\n===================================================================" ; mv $(AMALGAMATED_FILE)~ $(AMALGAMATED_FILE) ; false)
+	@mv $(AMALGAMATED_FILE)~ $(AMALGAMATED_FILE)
+
+# check if every header in nlohmann includes sufficient headers to be compiled
+# individually
+check-single-includes:
+	for x in $(SRCS); do \
+	  echo "#include <$$x>\nint main() {}\n" | sed 's|include/||' > single_include_test.cpp; \
+	  $(CXX) $(CXXFLAGS) -Iinclude -std=c++11 single_include_test.cpp -o single_include_test; \
+	  rm single_include_test.cpp single_include_test; \
+	done
+
+##########################################################################
+# changelog
+##########################################################################
+
+NEXT_VERSION ?= "unreleased"
+
+ChangeLog.md:
+	github_changelog_generator -o ChangeLog.md --simple-list --release-url https://github.com/nlohmann/json/releases/tag/%s --future-release $(NEXT_VERSION)
+	gsed -i 's|https://github.com/nlohmann/json/releases/tag/HEAD|https://github.com/nlohmann/json/tree/HEAD|' ChangeLog.md
+	gsed -i '2i All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/).' ChangeLog.md
+
+
+##########################################################################
+# release
+##########################################################################
+
+release:
+	mkdir release_files
+	zip -9 -r include.zip include/*
+	gpg --armor --detach-sig include.zip
+	mv include.zip include.zip.asc release_files
+	gpg --armor --detach-sig single_include/nlohmann/json.hpp
+	cp single_include/nlohmann/json.hpp release_files
+	mv single_include/nlohmann/json.hpp.asc release_files
+	cd release_files ; shasum -a 256 json.hpp > hashes.txt
+	cd release_files ; shasum -a 256 include.zip >> hashes.txt
--- a/vendor/nlohmann/README.md
+++ b/vendor/nlohmann/README.md
--- a/vendor/nlohmann/appveyor.yml
+++ b/vendor/nlohmann/appveyor.yml
@ -0,0 +1,59 @@
+version: '{build}'
+
+environment:
+  matrix:
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      COMPILER: mingw
+      platform: x86
+      FLAGS: ""
+      GENERATOR: Ninja
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      platform: x86
+      FLAGS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      platform: x86
+      FLAGS: ""
+      GENERATOR: Visual Studio 15 2017
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      platform: x86
+      FLAGS: "/permissive- /std:c++latest /utf-8"
+      GENERATOR: Visual Studio 15 2017
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+      platform: x64
+      FLAGS: ""
+      GENERATOR: Visual Studio 14 2015
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      platform: x64
+      FLAGS: ""
+      GENERATOR: Visual Studio 15 2017
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+      platform: x64
+      FLAGS: "/permissive- /std:c++latest /utf-8"
+      GENERATOR: Visual Studio 15 2017
+
+init:
+  - cmake --version
+  - msbuild /version
+
+install:
+  - if "%COMPILER%"=="mingw" appveyor DownloadFile https://github.com/ninja-build/ninja/releases/download/v1.6.0/ninja-win.zip -FileName ninja.zip
+  - if "%COMPILER%"=="mingw" 7z x ninja.zip -oC:\projects\deps\ninja > nul
+  - if "%COMPILER%"=="mingw" set PATH=C:\projects\deps\ninja;%PATH%
+  - if "%COMPILER%"=="mingw" set PATH=C:\mingw-w64\x86_64-7.3.0-posix-seh-rt_v5-rev0\mingw64\bin;%PATH%
+  - if "%COMPILER%"=="mingw" g++ --version
+
+before_build:
+  - cmake . -G "%GENERATOR%" -DCMAKE_CXX_FLAGS="%FLAGS%" -DCMAKE_IGNORE_PATH="C:/Program Files/Git/usr/bin"
+
+build_script:
+  - cmake --build . --config Release
+
+test_script:
+  - ctest -C Release -V -j
--- a/vendor/nlohmann/cmake/config.cmake.in
+++ b/vendor/nlohmann/cmake/config.cmake.in
@ -0,0 +1,15 @@
+include(FindPackageHandleStandardArgs)
+set(${CMAKE_FIND_PACKAGE_NAME}_CONFIG ${CMAKE_CURRENT_LIST_FILE})
+find_package_handle_standard_args(@PROJECT_NAME@ CONFIG_MODE)
+
+if(NOT TARGET @PROJECT_NAME@::@NLOHMANN_JSON_TARGET_NAME@)
+    include("${CMAKE_CURRENT_LIST_DIR}/@NLOHMANN_JSON_TARGETS_EXPORT_NAME@.cmake")
+    if((NOT TARGET @NLOHMANN_JSON_TARGET_NAME@) AND
+       (NOT @PROJECT_NAME@_FIND_VERSION OR
+        @PROJECT_NAME@_FIND_VERSION VERSION_LESS 3.2.0))
+        add_library(@NLOHMANN_JSON_TARGET_NAME@ INTERFACE IMPORTED)
+        set_target_properties(@NLOHMANN_JSON_TARGET_NAME@ PROPERTIES
+            INTERFACE_LINK_LIBRARIES @PROJECT_NAME@::@NLOHMANN_JSON_TARGET_NAME@
+        )
+    endif()
+endif()
--- a/vendor/nlohmann/doc/Doxyfile
+++ b/vendor/nlohmann/doc/Doxyfile
@ -0,0 +1,331 @@
+# Doxyfile 1.8.15
+
+#---------------------------------------------------------------------------
+# Project related configuration options
+#---------------------------------------------------------------------------
+DOXYFILE_ENCODING      = UTF-8
+PROJECT_NAME           = "JSON for Modern C++"
+PROJECT_NUMBER         = 3.5.0
+PROJECT_BRIEF          =
+PROJECT_LOGO           =
+OUTPUT_DIRECTORY       = .
+CREATE_SUBDIRS         = NO
+ALLOW_UNICODE_NAMES    = NO
+OUTPUT_LANGUAGE        = English
+OUTPUT_TEXT_DIRECTION  = None
+BRIEF_MEMBER_DESC      = YES
+REPEAT_BRIEF           = NO
+ABBREVIATE_BRIEF       =
+ALWAYS_DETAILED_SEC    = YES
+INLINE_INHERITED_MEMB  = NO
+FULL_PATH_NAMES        = YES
+STRIP_FROM_PATH        =
+STRIP_FROM_INC_PATH    =
+SHORT_NAMES            = NO
+JAVADOC_AUTOBRIEF      = NO
+QT_AUTOBRIEF           = NO
+MULTILINE_CPP_IS_BRIEF = NO
+INHERIT_DOCS           = YES
+SEPARATE_MEMBER_PAGES  = YES
+TAB_SIZE               = 4
+ALIASES                = "complexity=@par Complexity^^" \
+                         "liveexample{2}=@par Example^^ \1 ^^ @includelineno \2.cpp \n Output (play with this example @htmlinclude \2.link):^^ @verbinclude \2.output ^^ The <a href= https://github.com/nlohmann/json/blob/develop/doc/examples/\2.cpp>example code</a> above can be translated with @verbatim g++ -std=c++11 -Isingle_include doc/examples/\2.cpp -o \2 @endverbatim" \
+                         "requirement=@par Requirements^^" \
+                         "exceptionsafety=@par Exception safety^^" \
+                         "iterators=@par Iterator validity^^"
+TCL_SUBST              =
+OPTIMIZE_OUTPUT_FOR_C  = NO
+OPTIMIZE_OUTPUT_JAVA   = NO
+OPTIMIZE_FOR_FORTRAN   = NO
+OPTIMIZE_OUTPUT_VHDL   = NO
+EXTENSION_MAPPING      =
+MARKDOWN_SUPPORT       = YES
+TOC_INCLUDE_HEADINGS   = 0
+AUTOLINK_SUPPORT       = NO
+BUILTIN_STL_SUPPORT    = YES
+CPP_CLI_SUPPORT        = NO
+SIP_SUPPORT            = NO
+IDL_PROPERTY_SUPPORT   = YES
+DISTRIBUTE_GROUP_DOC   = NO
+GROUP_NESTED_COMPOUNDS = NO
+SUBGROUPING            = YES
+INLINE_GROUPED_CLASSES = NO
+INLINE_SIMPLE_STRUCTS  = NO
+TYPEDEF_HIDES_STRUCT   = NO
+LOOKUP_CACHE_SIZE      = 0
+#---------------------------------------------------------------------------
+# Build related configuration options
+#---------------------------------------------------------------------------
+EXTRACT_ALL            = YES
+EXTRACT_PRIVATE        = NO
+EXTRACT_PACKAGE        = YES
+EXTRACT_STATIC         = YES
+EXTRACT_LOCAL_CLASSES  = YES
+EXTRACT_LOCAL_METHODS  = YES
+EXTRACT_ANON_NSPACES   = YES
+HIDE_UNDOC_MEMBERS     = NO
+HIDE_UNDOC_CLASSES     = NO
+HIDE_FRIEND_COMPOUNDS  = NO
+HIDE_IN_BODY_DOCS      = NO
+INTERNAL_DOCS          = NO
+CASE_SENSE_NAMES       = NO
+HIDE_SCOPE_NAMES       = NO
+HIDE_COMPOUND_REFERENCE= NO
+SHOW_INCLUDE_FILES     = YES
+SHOW_GROUPED_MEMB_INC  = NO
+FORCE_LOCAL_INCLUDES   = NO
+INLINE_INFO            = YES
+SORT_MEMBER_DOCS       = YES
+SORT_BRIEF_DOCS        = YES
+SORT_MEMBERS_CTORS_1ST = YES
+SORT_GROUP_NAMES       = NO
+SORT_BY_SCOPE_NAME     = NO
+STRICT_PROTO_MATCHING  = NO
+GENERATE_TODOLIST      = YES
+GENERATE_TESTLIST      = YES
+GENERATE_BUGLIST       = YES
+GENERATE_DEPRECATEDLIST= YES
+ENABLED_SECTIONS       =
+MAX_INITIALIZER_LINES  = 30
+SHOW_USED_FILES        = NO
+SHOW_FILES             = NO
+SHOW_NAMESPACES        = NO
+FILE_VERSION_FILTER    =
+LAYOUT_FILE            =
+CITE_BIB_FILES         =
+#---------------------------------------------------------------------------
+# Configuration options related to warning and progress messages
+#---------------------------------------------------------------------------
+QUIET                  = YES
+WARNINGS               = YES
+WARN_IF_UNDOCUMENTED   = YES
+WARN_IF_DOC_ERROR      = YES
+WARN_NO_PARAMDOC       = YES
+WARN_AS_ERROR          = NO
+WARN_FORMAT            = "$file:$line: $text"
+WARN_LOGFILE           =
+#---------------------------------------------------------------------------
+# Configuration options related to the input files
+#---------------------------------------------------------------------------
+INPUT                  = ../single_include/nlohmann/json.hpp \
+                         index.md \
+                         faq.md \
+                         binary_formats.md
+INPUT_ENCODING         = UTF-8
+FILE_PATTERNS          =
+RECURSIVE              = NO
+EXCLUDE                =
+EXCLUDE_SYMLINKS       = NO
+EXCLUDE_PATTERNS       =
+EXCLUDE_SYMBOLS        = nlohmann::detail
+EXAMPLE_PATH           = examples
+EXAMPLE_PATTERNS       =
+EXAMPLE_RECURSIVE      = NO
+IMAGE_PATH             = images
+INPUT_FILTER           =
+FILTER_PATTERNS        =
+FILTER_SOURCE_FILES    = NO
+FILTER_SOURCE_PATTERNS =
+USE_MDFILE_AS_MAINPAGE = index.md
+#---------------------------------------------------------------------------
+# Configuration options related to source browsing
+#---------------------------------------------------------------------------
+SOURCE_BROWSER         = YES
+INLINE_SOURCES         = NO
+STRIP_CODE_COMMENTS    = YES
+REFERENCED_BY_RELATION = NO
+REFERENCES_RELATION    = NO
+REFERENCES_LINK_SOURCE = NO
+SOURCE_TOOLTIPS        = YES
+USE_HTAGS              = NO
+VERBATIM_HEADERS       = NO
+CLANG_ASSISTED_PARSING = YES
+CLANG_OPTIONS          = -std=c++11
+CLANG_COMPILATION_DATABASE_PATH                                        = 0
+#---------------------------------------------------------------------------
+# Configuration options related to the alphabetical class index
+#---------------------------------------------------------------------------
+ALPHABETICAL_INDEX     = YES
+COLS_IN_ALPHA_INDEX    = 5
+IGNORE_PREFIX          =
+#---------------------------------------------------------------------------
+# Configuration options related to the HTML output
+#---------------------------------------------------------------------------
+GENERATE_HTML          = YES
+HTML_OUTPUT            = html
+HTML_FILE_EXTENSION    = .html
+HTML_HEADER            =
+HTML_FOOTER            =
+HTML_STYLESHEET        =
+HTML_EXTRA_STYLESHEET  = css/mylayout.css
+HTML_EXTRA_FILES       =
+HTML_COLORSTYLE_HUE    = 220
+HTML_COLORSTYLE_SAT    = 100
+HTML_COLORSTYLE_GAMMA  = 80
+HTML_TIMESTAMP         = YES
+HTML_DYNAMIC_MENUS     = YES
+HTML_DYNAMIC_SECTIONS  = YES
+HTML_INDEX_NUM_ENTRIES = 100
+GENERATE_DOCSET        = YES
+DOCSET_FEEDNAME        = "Doxygen generated docs"
+DOCSET_BUNDLE_ID       = me.nlohmann.json
+DOCSET_PUBLISHER_ID    = me.nlohmann
+DOCSET_PUBLISHER_NAME  = NielsLohmann
+GENERATE_HTMLHELP      = NO
+CHM_FILE               =
+HHC_LOCATION           =
+GENERATE_CHI           = NO
+CHM_INDEX_ENCODING     =
+BINARY_TOC             = NO
+TOC_EXPAND             = NO
+GENERATE_QHP           = NO
+QCH_FILE               =
+QHP_NAMESPACE          = org.doxygen.Project
+QHP_VIRTUAL_FOLDER     = doc
+QHP_CUST_FILTER_NAME   =
+QHP_CUST_FILTER_ATTRS  =
+QHP_SECT_FILTER_ATTRS  =
+QHG_LOCATION           =
+GENERATE_ECLIPSEHELP   = NO
+ECLIPSE_DOC_ID         = org.doxygen.Project
+DISABLE_INDEX          = NO
+GENERATE_TREEVIEW      = NO
+ENUM_VALUES_PER_LINE   = 4
+TREEVIEW_WIDTH         = 250
+EXT_LINKS_IN_WINDOW    = NO
+FORMULA_FONTSIZE       = 10
+FORMULA_TRANSPARENT    = YES
+USE_MATHJAX            = NO
+MATHJAX_FORMAT         = HTML-CSS
+MATHJAX_RELPATH        = http://cdn.mathjax.org/mathjax/latest
+MATHJAX_EXTENSIONS     =
+MATHJAX_CODEFILE       =
+SEARCHENGINE           = YES
+SERVER_BASED_SEARCH    = NO
+EXTERNAL_SEARCH        = NO
+SEARCHENGINE_URL       =
+SEARCHDATA_FILE        = searchdata.xml
+EXTERNAL_SEARCH_ID     =
+EXTRA_SEARCH_MAPPINGS  =
+#---------------------------------------------------------------------------
+# Configuration options related to the LaTeX output
+#---------------------------------------------------------------------------
+GENERATE_LATEX         = NO
+LATEX_OUTPUT           = latex
+LATEX_CMD_NAME         = latex
+MAKEINDEX_CMD_NAME     = makeindex
+COMPACT_LATEX          = NO
+PAPER_TYPE             = a4
+EXTRA_PACKAGES         =
+LATEX_HEADER           =
+LATEX_FOOTER           =
+LATEX_EXTRA_STYLESHEET =
+LATEX_EXTRA_FILES      =
+PDF_HYPERLINKS         = YES
+USE_PDFLATEX           = YES
+LATEX_BATCHMODE        = NO
+LATEX_HIDE_INDICES     = NO
+LATEX_SOURCE_CODE      = NO
+LATEX_BIB_STYLE        = plain
+LATEX_TIMESTAMP        = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the RTF output
+#---------------------------------------------------------------------------
+GENERATE_RTF           = NO
+RTF_OUTPUT             = rtf
+COMPACT_RTF            = NO
+RTF_HYPERLINKS         = NO
+RTF_STYLESHEET_FILE    =
+RTF_EXTENSIONS_FILE    =
+RTF_SOURCE_CODE        = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the man page output
+#---------------------------------------------------------------------------
+GENERATE_MAN           = NO
+MAN_OUTPUT             = man
+MAN_EXTENSION          = .3
+MAN_SUBDIR             =
+MAN_LINKS              = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the XML output
+#---------------------------------------------------------------------------
+GENERATE_XML           = YES
+XML_OUTPUT             = xml
+XML_PROGRAMLISTING     = YES
+#---------------------------------------------------------------------------
+# Configuration options related to the DOCBOOK output
+#---------------------------------------------------------------------------
+GENERATE_DOCBOOK       = NO
+DOCBOOK_OUTPUT         = docbook
+DOCBOOK_PROGRAMLISTING = NO
+#---------------------------------------------------------------------------
+# Configuration options for the AutoGen Definitions output
+#---------------------------------------------------------------------------
+GENERATE_AUTOGEN_DEF   = NO
+#---------------------------------------------------------------------------
+# Configuration options related to the Perl module output
+#---------------------------------------------------------------------------
+GENERATE_PERLMOD       = NO
+PERLMOD_LATEX          = NO
+PERLMOD_PRETTY         = YES
+PERLMOD_MAKEVAR_PREFIX =
+#---------------------------------------------------------------------------
+# Configuration options related to the preprocessor
+#---------------------------------------------------------------------------
+ENABLE_PREPROCESSING   = YES
+MACRO_EXPANSION        = NO
+EXPAND_ONLY_PREDEF     = NO
+SEARCH_INCLUDES        = YES
+INCLUDE_PATH           =
+INCLUDE_FILE_PATTERNS  =
+PREDEFINED             =
+EXPAND_AS_DEFINED      =
+SKIP_FUNCTION_MACROS   = YES
+#---------------------------------------------------------------------------
+# Configuration options related to external references
+#---------------------------------------------------------------------------
+TAGFILES               =
+GENERATE_TAGFILE       = html/nlohmann_json.tag
+ALLEXTERNALS           = NO
+EXTERNAL_GROUPS        = YES
+EXTERNAL_PAGES         = YES
+PERL_PATH              = /usr/bin/perl
+#---------------------------------------------------------------------------
+# Configuration options related to the dot tool
+#---------------------------------------------------------------------------
+CLASS_DIAGRAMS         = NO
+MSCGEN_PATH            =
+DIA_PATH               =
+HIDE_UNDOC_RELATIONS   = YES
+HAVE_DOT               = YES
+DOT_NUM_THREADS        = 0
+DOT_FONTNAME           = Helvetica
+DOT_FONTSIZE           = 10
+DOT_FONTPATH           =
+CLASS_GRAPH            = NO
+COLLABORATION_GRAPH    = NO
+GROUP_GRAPHS           = YES
+UML_LOOK               = YES
+UML_LIMIT_NUM_FIELDS   = 10
+TEMPLATE_RELATIONS     = NO
+INCLUDE_GRAPH          = NO
+INCLUDED_BY_GRAPH      = NO
+CALL_GRAPH             = NO
+CALLER_GRAPH           = NO
+GRAPHICAL_HIERARCHY    = NO
+DIRECTORY_GRAPH        = NO
+DOT_IMAGE_FORMAT       = svg
+INTERACTIVE_SVG        = YES
+DOT_PATH               =
+DOTFILE_DIRS           =
+MSCFILE_DIRS           =
+DIAFILE_DIRS           =
+PLANTUML_JAR_PATH      =
+PLANTUML_CFG_FILE      =
+PLANTUML_INCLUDE_PATH  =
+DOT_GRAPH_MAX_NODES    = 50
+MAX_DOT_GRAPH_DEPTH    = 0
+DOT_TRANSPARENT        = NO
+DOT_MULTI_TARGETS      = NO
+GENERATE_LEGEND        = YES
+DOT_CLEANUP            = YES
--- a/vendor/nlohmann/doc/Makefile
+++ b/vendor/nlohmann/doc/Makefile
@ -0,0 +1,88 @@
+SRCDIR = ../single_include
+SED:=$(shell command -v gsed || which sed)
+
+all: doxygen
+
+
+##########################################################################
+# example files
+##########################################################################
+
+# where are the example cpp files
+EXAMPLES = $(wildcard examples/*.cpp)
+
+# create output from a stand-alone example file
+%.output: %.cpp
+	make $(<:.cpp=) CPPFLAGS="-I $(SRCDIR)" CXXFLAGS="-std=c++11"
+	./$(<:.cpp=) > $@
+	rm $(<:.cpp=)
+
+# compare created output with current output of the example files
+%.test: %.cpp
+	make $(<:.cpp=) CPPFLAGS="-I $(SRCDIR)" CXXFLAGS="-std=c++11"
+	./$(<:.cpp=) > $@
+	diff $@ $(<:.cpp=.output)
+	rm $(<:.cpp=) $@
+
+# create links to try the code online
+%.link: %.cpp
+	rm -fr tmp
+	mkdir tmp
+	cp -r $(SRCDIR)/nlohmann tmp
+	python2 scripts/send_to_wandbox.py tmp $< > $@.tmp
+	/bin/echo -n "<a target=\"_blank\" href=\"`cat $@.tmp`\"><b>online</b></a>" > $@
+	rm -fr tmp $@.tmp
+
+# create output from all stand-alone example files
+create_output: $(EXAMPLES:.cpp=.output)
+
+create_links: $(EXAMPLES:.cpp=.link)
+
+# check output of all stand-alone example files
+check_output: $(EXAMPLES:.cpp=.test)
+
+
+clean:
+	rm -fr me.nlohmann.json.docset html $(EXAMPLES:.cpp=)
+
+
+##########################################################################
+# Doxygen HTML documentation
+##########################################################################
+
+# create Doxygen documentation
+doxygen: create_output create_links
+	doxygen
+	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType, JSONSerializer &gt;@@g' html/*.html
+	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberFloatType,&#160;AllocatorType&#160;JSONSerializer&#160;&gt;@@g' html/*.html
+	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer &gt;@@g' html/*.html
+	$(SED) -i 's@< ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer >@@g' html/*.html
+	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberUnsignedType,&#160;NumberFloatType,&#160;AllocatorType&#160;JSONSerializer&#160;&gt;@@g' html/*.html
+	$(SED) -i 's@template&lt;template&lt; typename U, typename V, typename... Args &gt; class ObjectType = std::map, template&lt; typename U, typename... Args &gt; class ArrayType = std::vector, class StringType = std::string, class BooleanType = bool, class NumberIntegerType = std::int64_t, class NumberUnsignedType = std::uint64_t, class NumberFloatType = double, template&lt; typename U &gt; class AllocatorType = std::allocator, template&lt; typename T, typename SFINAE=void &gt; class JSONSerializer = adl_serializer&gt;@@g' html/*.html
+	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberUnsignedType, NumberFloatType, AllocatorType, JSONSerializer &gt;@@g' html/*.html
+	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberUnsignedType,&#160;NumberFloatType,&#160;AllocatorType,&#160;JSONSerializer&#160;&gt;@@g' html/*.html
+
+upload: clean doxygen check_output
+	scripts/git-update-ghpages nlohmann/json html
+	rm -fr html
+	open http://nlohmann.github.io/json/
+
+
+##########################################################################
+# docset
+##########################################################################
+
+# create docset for Dash
+docset: create_output
+	cp Doxyfile Doxyfile_docset
+	$(SED) -i 's/DISABLE_INDEX          = NO/DISABLE_INDEX          = YES/' Doxyfile_docset
+	$(SED) -i 's/SEARCHENGINE           = YES/SEARCHENGINE           = NO/' Doxyfile_docset
+	$(SED) -i 's@HTML_EXTRA_STYLESHEET  = css/mylayout.css@HTML_EXTRA_STYLESHEET  = css/mylayout_docset.css@' Doxyfile_docset
+	rm -fr html *.docset
+	doxygen Doxyfile_docset
+	$(SED) -i 's@&lt; ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType &gt;@@g' html/*.html
+	$(SED) -i 's@&lt;&#160;ObjectType,&#160;ArrayType,&#160;StringType,&#160;BooleanType,&#160;NumberIntegerType,&#160;NumberFloatType,&#160;AllocatorType&#160;&gt;@@g' html/*.html
+	make -C html
+	mv html/*.docset .
+	$(SED) -i 's@<string>doxygen</string>@<string>json</string>@' me.nlohmann.json.docset/Contents/Info.plist
+	rm -fr Doxyfile_docset html
--- a/vendor/nlohmann/doc/avatars.png
+++ b/vendor/nlohmann/doc/avatars.png
--- a/vendor/nlohmann/doc/binary_formats.md
+++ b/vendor/nlohmann/doc/binary_formats.md
@ -0,0 +1,171 @@
+# Binary formats
+
+![conversion between JSON and binary formats](images/binary.png)
+
+Several formats exist that encode JSON values in a binary format to reduce the size of the encoded value as well as the required effort to parse encoded value. The library implements three formats, namely
+
+- [CBOR](https://tools.ietf.org/html/rfc7049) (Concise Binary Object Representation)
+- [MessagePack](https://msgpack.org)
+- [UBJSON](http://ubjson.org) (Universal Binary JSON)
+
+## Interface
+
+### JSON to binary format
+
+For each format, the `to_*` functions (i.e., `to_cbor`, `to_msgpack`, and `to_ubjson`) convert a JSON value into the respective binary format. Taking CBOR as example, the concrete prototypes are:
+
+```cpp
+static std::vector<uint8_t> to_cbor(const basic_json& j);                    // 1
+static void to_cbor(const basic_json& j, detail::output_adapter<uint8_t> o); // 2
+static void to_cbor(const basic_json& j, detail::output_adapter<char> o);    // 3
+```
+
+The first function creates a byte vector from the given JSON value. The second and third function writes to an output adapter of `uint8_t` and `char`, respectively. Output adapters are implemented for strings, output streams, and vectors.
+
+Given a JSON value `j`, the following calls are possible:
+
+```cpp
+std::vector<uint8_t> v;
+v = json::to_cbor(j);   // 1
+
+json::to_cbor(j, v);    // 2
+
+std::string s;
+json::to_cbor(j, s);    // 3
+
+std::ostringstream oss;
+json::to_cbor(j, oss);  // 3
+```
+
+### Binary format to JSON
+
+Likewise, the `from_*` functions (i.e, `from_cbor`, `from_msgpack`, and `from_ubjson`) convert a binary encoded value into a JSON value. Taking CBOR as example, the concrete prototypes are:
+
+```cpp
+static basic_json from_cbor(detail::input_adapter i, const bool strict = true); // 1
+static basic_json from_cbor(A1 && a1, A2 && a2, const bool strict = true);      // 2
+```
+
+Both functions read from an input adapter: the first function takes it directly form argument `i`, whereas the second function creates it from the provided arguments `a1` and `a2`. If the optional parameter `strict` is true, the input must be read completely (or a parse error exception is thrown). If it is false, parsing succeeds even if the input is not completely read.
+
+Input adapters are implemented for input streams, character buffers, string literals, and iterator ranges.
+
+Given several inputs (which we assume to be filled with a CBOR value), the following calls are possible:
+
+```cpp
+std::string s;
+json j1 = json::from_cbor(s);                         // 1
+
+std::ifstream is("somefile.cbor", std::ios::binary);
+json j2 = json::from_cbor(is);                        // 1
+
+std::vector<uint8_t> v;
+json j3 = json::from_cbor(v);                         // 1
+
+const char* buff;
+std::size_t buff_size;
+json j4 = json::from_cbor(buff, buff_size);           // 2
+```
+
+## Details
+
+### CBOR
+
+The mapping from CBOR to JSON is **incomplete** in the sense that not all CBOR types can be converted to a JSON value. The following CBOR types are not supported and will yield parse errors (parse_error.112):
+
+- byte strings (0x40..0x5F)
+- date/time (0xC0..0xC1)
+- bignum (0xC2..0xC3)
+- decimal fraction (0xC4)
+- bigfloat (0xC5)
+- tagged items (0xC6..0xD4, 0xD8..0xDB)
+- expected conversions (0xD5..0xD7)
+- simple values (0xE0..0xF3, 0xF8)
+- undefined (0xF7)
+
+CBOR further allows map keys of any type, whereas JSON only allows strings as keys in object values. Therefore, CBOR maps with keys other than UTF-8 strings are rejected (parse_error.113).
+
+The mapping from JSON to CBOR is **complete** in the sense that any JSON value type can be converted to a CBOR value.
+
+If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the dump() function which serializes NaN or Infinity to null.
+
+The following CBOR types are not used in the conversion:
+
+- byte strings (0x40..0x5F)
+- UTF-8 strings terminated by "break" (0x7F)
+- arrays terminated by "break" (0x9F)
+- maps terminated by "break" (0xBF)
+- date/time (0xC0..0xC1)
+- bignum (0xC2..0xC3)
+- decimal fraction (0xC4)
+- bigfloat (0xC5)
+- tagged items (0xC6..0xD4, 0xD8..0xDB)
+- expected conversions (0xD5..0xD7)
+- simple values (0xE0..0xF3, 0xF8)
+- undefined (0xF7)
+- half and single-precision floats (0xF9-0xFA)
+- break (0xFF)
+
+### MessagePack
+
+The mapping from MessagePack to JSON is **incomplete** in the sense that not all MessagePack types can be converted to a JSON value. The following MessagePack types are not supported and will yield parse errors:
+
+- bin 8 - bin 32 (0xC4..0xC6)
+- ext 8 - ext 32 (0xC7..0xC9)
+- fixext 1 - fixext 16 (0xD4..0xD8)
+
+The mapping from JSON to MessagePack is **complete** in the sense that any JSON value type can be converted to a MessagePack value.
+
+The following values can not be converted to a MessagePack value:
+
+- strings with more than 4294967295 bytes
+- arrays with more than 4294967295 elements
+- objects with more than 4294967295 elements
+
+The following MessagePack types are not used in the conversion:
+
+- bin 8 - bin 32 (0xC4..0xC6)
+- ext 8 - ext 32 (0xC7..0xC9)
+- float 32 (0xCA)
+- fixext 1 - fixext 16 (0xD4..0xD8)
+
+Any MessagePack output created `to_msgpack` can be successfully parsed by `from_msgpack`.
+
+If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the `dump()` function which serializes NaN or Infinity to `null`.
+
+### UBJSON
+
+The mapping from UBJSON to JSON is **complete** in the sense that any UBJSON value can be converted to a JSON value.
+
+The mapping from JSON to UBJSON is **complete** in the sense that any JSON value type can be converted to a UBJSON value.
+
+The following values can not be converted to a UBJSON value:
+
+- strings with more than 9223372036854775807 bytes (theoretical)
+- unsigned integer numbers above 9223372036854775807
+
+The following markers are not used in the conversion:
+
+- `Z`: no-op values are not created.
+- `C`: single-byte strings are serialized with S markers.
+
+Any UBJSON output created to_ubjson can be successfully parsed by from_ubjson.
+
+If NaN or Infinity are stored inside a JSON number, they are serialized properly. This behavior differs from the `dump()` function which serializes NaN or Infinity to null.
+
+The optimized formats for containers are supported: Parameter `use_size` adds size information to the beginning of a container and removes the closing marker. Parameter `use_type` further checks whether all elements of a container have the same type and adds the type marker to the beginning of the container. The `use_type` parameter must only be used together with `use_size = true`. Note that `use_size = true` alone may result in larger representations - the benefit of this parameter is that the receiving side is immediately informed on the number of elements of the container.
+
+## Size comparison examples
+
+The following table shows the size compared to the original JSON value for different files from the repository for the different formats.
+
+| format                  | sample.json | all_unicode.json | floats.json | signed_ints.json | jeopardy.json | canada.json |
+| ----------------------- | -----------:| ----------------:| -----------:| ----------------:| -------------:| -----------:|
+| JSON                    |    100.00 % |         100.00 % |    100.00 % |         100.00 % |      100.00 % |    100.00 % |
+| CBOR                    |     87.21 % |          71.18 % |     48.20 % |          44.16 % |       87.96 % |     50.53 % |
+| MessagePack             |     87.16 % |          71.18 % |     48.20 % |          44.16 % |       87.91 % |     50.56 % |
+| UBJSON unoptimized      |     88.15 % |         100.00 % |     48.20 % |          44.16 % |       96.58 % |     53.20 % |
+| UBJSON size-optimized   |     89.26 % |         100.00 % |     48.20 % |          44.16 % |       97.40 % |     58.56 % |
+| UBJSON format-optimized |     89.45 % |         100.00 % |     42.85 % |          39.26 % |       94.96 % |     55.93 % |
+
+The results show that there does not exist a "best" encoding. Furthermore, it is not always worthwhile to use UBJSON's optimizations.
--- a/vendor/nlohmann/doc/css/mylayout.css
+++ b/vendor/nlohmann/doc/css/mylayout.css
@ -0,0 +1,26 @@
+/* hide lengthy template information */
+.memtemplate, .memTemplParams {
+    display: none;
+}
+
+/* allow compiler information to wrap */
+/* https://css-tricks.com/snippets/css/make-pre-text-wrap/ */
+pre.fragment {
+    white-space: pre-wrap;       /* css-3 */
+    white-space: -moz-pre-wrap;  /* Mozilla, since 1999 */
+    white-space: -pre-wrap;      /* Opera 4-6 */
+    white-space: -o-pre-wrap;    /* Opera 7 */
+    word-wrap: break-word;       /* Internet Explorer 5.5+ */
+}
+
+td.paramname {
+    vertical-align: top;
+}
+
+.ok_green {
+    background-color: #89C35C;
+}
+
+.nok_throws {
+    background-color: #ffa500;
+}
--- a/vendor/nlohmann/doc/css/mylayout_docset.css
+++ b/vendor/nlohmann/doc/css/mylayout_docset.css
@ -0,0 +1,27 @@
+.memtemplate {
+    display: none;
+}
+
+.memTemplParams {
+    display: none;
+}
+
+.navtab {
+    display: none;
+}
+
+#top, .footer {
+    display: none;
+}
+
+td.paramname {
+    vertical-align: top;
+}
+
+.ok_green {
+    background-color: #89C35C;
+}
+
+.nok_throws {
+    background-color: #ffa500;
+}
--- a/vendor/nlohmann/doc/examples/README.cpp
+++ b/vendor/nlohmann/doc/examples/README.cpp
@ -0,0 +1,39 @@
+#include <iostream>
+#include <iomanip>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON object
+    json j =
+    {
+        {"pi", 3.141},
+        {"happy", true},
+        {"name", "Niels"},
+        {"nothing", nullptr},
+        {
+            "answer", {
+                {"everything", 42}
+            }
+        },
+        {"list", {1, 0, 2}},
+        {
+            "object", {
+                {"currency", "USD"},
+                {"value", 42.99}
+            }
+        }
+    };
+
+    // add new values
+    j["new"]["key"]["value"] = {"another", "list"};
+
+    // count elements
+    auto s = j.size();
+    j["size"] = s;
+
+    // pretty print with indent of 4 spaces
+    std::cout << std::setw(4) << j << '\n';
+}
--- a/vendor/nlohmann/doc/examples/README.link
+++ b/vendor/nlohmann/doc/examples/README.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/jhAlfAa9ZPKTp8JK"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/README.output
+++ b/vendor/nlohmann/doc/examples/README.output
@ -0,0 +1,27 @@
+{
+    "answer": {
+        "everything": 42
+    },
+    "happy": true,
+    "list": [
+        1,
+        0,
+        2
+    ],
+    "name": "Niels",
+    "new": {
+        "key": {
+            "value": [
+                "another",
+                "list"
+            ]
+        }
+    },
+    "nothing": null,
+    "object": {
+        "currency": "USD",
+        "value": 42.99
+    },
+    "pi": 3.141,
+    "size": 8
+}
--- a/vendor/nlohmann/doc/examples/array.cpp
+++ b/vendor/nlohmann/doc/examples/array.cpp
@ -0,0 +1,19 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON arrays
+    json j_no_init_list = json::array();
+    json j_empty_init_list = json::array({});
+    json j_nonempty_init_list = json::array({1, 2, 3, 4});
+    json j_list_of_pairs = json::array({ {"one", 1}, {"two", 2} });
+
+    // serialize the JSON arrays
+    std::cout << j_no_init_list << '\n';
+    std::cout << j_empty_init_list << '\n';
+    std::cout << j_nonempty_init_list << '\n';
+    std::cout << j_list_of_pairs << '\n';
+}
--- a/vendor/nlohmann/doc/examples/array.link
+++ b/vendor/nlohmann/doc/examples/array.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/piWraYhVg2CV3j2H"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/array.output
+++ b/vendor/nlohmann/doc/examples/array.output
@ -0,0 +1,4 @@
+[]
+[]
+[1,2,3,4]
+[["one",1],["two",2]]
--- a/vendor/nlohmann/doc/examples/at__object_t_key_type.cpp
+++ b/vendor/nlohmann/doc/examples/at__object_t_key_type.cpp
@ -0,0 +1,48 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON object
+    json object =
+    {
+        {"the good", "il buono"},
+        {"the bad", "il cattivo"},
+        {"the ugly", "il brutto"}
+    };
+
+    // output element with key "the ugly"
+    std::cout << object.at("the ugly") << '\n';
+
+    // change element with key "the bad"
+    object.at("the bad") = "il cattivo";
+
+    // output changed array
+    std::cout << object << '\n';
+
+
+    // exception type_error.304
+    try
+    {
+        // use at() on a non-object type
+        json str = "I am a string";
+        str.at("the good") = "Another string";
+    }
+    catch (json::type_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // exception out_of_range.401
+    try
+    {
+        // try to write at a nonexisting key
+        object.at("the fast") = "il rapido";
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}
--- a/vendor/nlohmann/doc/examples/at__object_t_key_type.link
+++ b/vendor/nlohmann/doc/examples/at__object_t_key_type.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/wtWzPSQWWiuxldVs"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/at__object_t_key_type.output
+++ b/vendor/nlohmann/doc/examples/at__object_t_key_type.output
@ -0,0 +1,4 @@
+"il brutto"
+{"the bad":"il cattivo","the good":"il buono","the ugly":"il brutto"}
+[json.exception.type_error.304] cannot use at() with string
+[json.exception.out_of_range.403] key 'the fast' not found
--- a/vendor/nlohmann/doc/examples/at__object_t_key_type_const.cpp
+++ b/vendor/nlohmann/doc/examples/at__object_t_key_type_const.cpp
@ -0,0 +1,42 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON object
+    json object =
+    {
+        {"the good", "il buono"},
+        {"the bad", "il cattivo"},
+        {"the ugly", "il brutto"}
+    };
+
+    // output element with key "the ugly"
+    std::cout << object.at("the ugly") << '\n';
+
+
+    // exception type_error.304
+    try
+    {
+        // use at() on a non-object type
+        const json str = "I am a string";
+        std::cout << str.at("the good") << '\n';
+    }
+    catch (json::type_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // exception out_of_range.401
+    try
+    {
+        // try to read from a nonexisting key
+        std::cout << object.at("the fast") << '\n';
+    }
+    catch (json::out_of_range)
+    {
+        std::cout << "out of range" << '\n';
+    }
+}
--- a/vendor/nlohmann/doc/examples/at__object_t_key_type_const.link
+++ b/vendor/nlohmann/doc/examples/at__object_t_key_type_const.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/Zh3iTnZNxsSgBvm3"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/at__object_t_key_type_const.output
+++ b/vendor/nlohmann/doc/examples/at__object_t_key_type_const.output
@ -0,0 +1,3 @@
+"il brutto"
+[json.exception.type_error.304] cannot use at() with string
+out of range
--- a/vendor/nlohmann/doc/examples/at__size_type.cpp
+++ b/vendor/nlohmann/doc/examples/at__size_type.cpp
@ -0,0 +1,43 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON array
+    json array = {"first", "2nd", "third", "fourth"};
+
+    // output element at index 2 (third element)
+    std::cout << array.at(2) << '\n';
+
+    // change element at index 1 (second element) to "second"
+    array.at(1) = "second";
+
+    // output changed array
+    std::cout << array << '\n';
+
+
+    // exception type_error.304
+    try
+    {
+        // use at() on a non-array type
+        json str = "I am a string";
+        str.at(0) = "Another string";
+    }
+    catch (json::type_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // exception out_of_range.401
+    try
+    {
+        // try to write beyond the array limit
+        array.at(5) = "sixth";
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}
--- a/vendor/nlohmann/doc/examples/at__size_type.link
+++ b/vendor/nlohmann/doc/examples/at__size_type.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/MfM8XIuPWMvxxdeb"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/at__size_type.output
+++ b/vendor/nlohmann/doc/examples/at__size_type.output
@ -0,0 +1,4 @@
+"third"
+["first","second","third","fourth"]
+[json.exception.type_error.304] cannot use at() with string
+[json.exception.out_of_range.401] array index 5 is out of range
--- a/vendor/nlohmann/doc/examples/at__size_type_const.cpp
+++ b/vendor/nlohmann/doc/examples/at__size_type_const.cpp
@ -0,0 +1,37 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON array
+    const json array = {"first", "2nd", "third", "fourth"};
+
+    // output element at index 2 (third element)
+    std::cout << array.at(2) << '\n';
+
+
+    // exception type_error.304
+    try
+    {
+        // use at() on a non-array type
+        const json str = "I am a string";
+        std::cout << str.at(0) << '\n';
+    }
+    catch (json::type_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // exception out_of_range.401
+    try
+    {
+        // try to read beyond the array limit
+        std::cout << array.at(5) << '\n';
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}
--- a/vendor/nlohmann/doc/examples/at__size_type_const.link
+++ b/vendor/nlohmann/doc/examples/at__size_type_const.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/eFEcnFZxfdLGSMhw"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/at__size_type_const.output
+++ b/vendor/nlohmann/doc/examples/at__size_type_const.output
@ -0,0 +1,3 @@
+"third"
+[json.exception.type_error.304] cannot use at() with string
+[json.exception.out_of_range.401] array index 5 is out of range
--- a/vendor/nlohmann/doc/examples/at_json_pointer.cpp
+++ b/vendor/nlohmann/doc/examples/at_json_pointer.cpp
@ -0,0 +1,103 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value
+    json j =
+    {
+        {"number", 1}, {"string", "foo"}, {"array", {1, 2}}
+    };
+
+    // read-only access
+
+    // output element with JSON pointer "/number"
+    std::cout << j.at("/number"_json_pointer) << '\n';
+    // output element with JSON pointer "/string"
+    std::cout << j.at("/string"_json_pointer) << '\n';
+    // output element with JSON pointer "/array"
+    std::cout << j.at("/array"_json_pointer) << '\n';
+    // output element with JSON pointer "/array/1"
+    std::cout << j.at("/array/1"_json_pointer) << '\n';
+
+    // writing access
+
+    // change the string
+    j.at("/string"_json_pointer) = "bar";
+    // output the changed string
+    std::cout << j["string"] << '\n';
+
+    // change an array element
+    j.at("/array/1"_json_pointer) = 21;
+    // output the changed array
+    std::cout << j["array"] << '\n';
+
+
+    // out_of_range.106
+    try
+    {
+        // try to use an array index with leading '0'
+        json::reference ref = j.at("/array/01"_json_pointer);
+    }
+    catch (json::parse_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.109
+    try
+    {
+        // try to use an array index that is not a number
+        json::reference ref = j.at("/array/one"_json_pointer);
+    }
+    catch (json::parse_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.401
+    try
+    {
+        // try to use a an invalid array index
+        json::reference ref = j.at("/array/4"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.402
+    try
+    {
+        // try to use the array index '-'
+        json::reference ref = j.at("/array/-"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.403
+    try
+    {
+        // try to use a JSON pointer to an nonexistent object key
+        json::const_reference ref = j.at("/foo"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.404
+    try
+    {
+        // try to use a JSON pointer that cannot be resolved
+        json::reference ref = j.at("/number/foo"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}
--- a/vendor/nlohmann/doc/examples/at_json_pointer.link
+++ b/vendor/nlohmann/doc/examples/at_json_pointer.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/ST2lraxpPLdDOUFn"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/at_json_pointer.output
+++ b/vendor/nlohmann/doc/examples/at_json_pointer.output
@ -0,0 +1,12 @@
+1
+"foo"
+[1,2]
+2
+"bar"
+[1,21]
+[json.exception.parse_error.106] parse error: array index '01' must not begin with '0'
+[json.exception.parse_error.109] parse error: array index 'one' is not a number
+[json.exception.out_of_range.401] array index 4 is out of range
+[json.exception.out_of_range.402] array index '-' (2) is out of range
+[json.exception.out_of_range.403] key 'foo' not found
+[json.exception.out_of_range.404] unresolved reference token 'foo'
--- a/vendor/nlohmann/doc/examples/at_json_pointer_const.cpp
+++ b/vendor/nlohmann/doc/examples/at_json_pointer_const.cpp
@ -0,0 +1,79 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value
+    const json j =
+    {
+        {"number", 1}, {"string", "foo"}, {"array", {1, 2}}
+    };
+
+    // read-only access
+
+    // output element with JSON pointer "/number"
+    std::cout << j.at("/number"_json_pointer) << '\n';
+    // output element with JSON pointer "/string"
+    std::cout << j.at("/string"_json_pointer) << '\n';
+    // output element with JSON pointer "/array"
+    std::cout << j.at("/array"_json_pointer) << '\n';
+    // output element with JSON pointer "/array/1"
+    std::cout << j.at("/array/1"_json_pointer) << '\n';
+
+    // out_of_range.109
+    try
+    {
+        // try to use an array index that is not a number
+        json::const_reference ref = j.at("/array/one"_json_pointer);
+    }
+    catch (json::parse_error& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.401
+    try
+    {
+        // try to use a an invalid array index
+        json::const_reference ref = j.at("/array/4"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.402
+    try
+    {
+        // try to use the array index '-'
+        json::const_reference ref = j.at("/array/-"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.403
+    try
+    {
+        // try to use a JSON pointer to an nonexistent object key
+        json::const_reference ref = j.at("/foo"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+
+    // out_of_range.404
+    try
+    {
+        // try to use a JSON pointer that cannot be resolved
+        json::const_reference ref = j.at("/number/foo"_json_pointer);
+    }
+    catch (json::out_of_range& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}
--- a/vendor/nlohmann/doc/examples/at_json_pointer_const.link
+++ b/vendor/nlohmann/doc/examples/at_json_pointer_const.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/FkPwquIlr9pojvGf"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/at_json_pointer_const.output
+++ b/vendor/nlohmann/doc/examples/at_json_pointer_const.output
@ -0,0 +1,9 @@
+1
+"foo"
+[1,2]
+2
+[json.exception.parse_error.109] parse error: array index 'one' is not a number
+[json.exception.out_of_range.401] array index 4 is out of range
+[json.exception.out_of_range.402] array index '-' (2) is out of range
+[json.exception.out_of_range.403] key 'foo' not found
+[json.exception.out_of_range.404] unresolved reference token 'foo'
--- a/vendor/nlohmann/doc/examples/back.cpp
+++ b/vendor/nlohmann/doc/examples/back.cpp
@ -0,0 +1,38 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json j_boolean = true;
+    json j_number_integer = 17;
+    json j_number_float = 23.42;
+    json j_object = {{"one", 1}, {"two", 2}};
+    json j_object_empty(json::value_t::object);
+    json j_array = {1, 2, 4, 8, 16};
+    json j_array_empty(json::value_t::array);
+    json j_string = "Hello, world";
+
+    // call back()
+    std::cout << j_boolean.back() << '\n';
+    std::cout << j_number_integer.back() << '\n';
+    std::cout << j_number_float.back() << '\n';
+    std::cout << j_object.back() << '\n';
+    //std::cout << j_object_empty.back() << '\n';  // undefined behavior
+    std::cout << j_array.back() << '\n';
+    //std::cout << j_array_empty.back() << '\n';   // undefined behavior
+    std::cout << j_string.back() << '\n';
+
+    // back() called on a null value
+    try
+    {
+        json j_null;
+        j_null.back();
+    }
+    catch (json::invalid_iterator& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}
--- a/vendor/nlohmann/doc/examples/back.link
+++ b/vendor/nlohmann/doc/examples/back.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/AxHC1Xl6KALWJ0FJ"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/back.output
+++ b/vendor/nlohmann/doc/examples/back.output
@ -0,0 +1,7 @@
+true
+17
+23.42
+2
+16
+"Hello, world"
+[json.exception.invalid_iterator.214] cannot get value
--- a/vendor/nlohmann/doc/examples/basic_json__CompatibleType.cpp
+++ b/vendor/nlohmann/doc/examples/basic_json__CompatibleType.cpp
@ -0,0 +1,218 @@
+#include <iostream>
+#include <deque>
+#include <list>
+#include <forward_list>
+#include <set>
+#include <unordered_map>
+#include <unordered_set>
+#include <valarray>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // ============
+    // object types
+    // ============
+
+    // create an object from an object_t value
+    json::object_t object_value = { {"one", 1}, {"two", 2} };
+    json j_object_t(object_value);
+
+    // create an object from std::map
+    std::map<std::string, int> c_map
+    {
+        {"one", 1}, {"two", 2}, {"three", 3}
+    };
+    json j_map(c_map);
+
+    // create an object from std::unordered_map
+    std::unordered_map<const char*, double> c_umap
+    {
+        {"one", 1.2}, {"two", 2.3}, {"three", 3.4}
+    };
+    json j_umap(c_umap);
+
+    // create an object from std::multimap
+    std::multimap<std::string, bool> c_mmap
+    {
+        {"one", true}, {"two", true}, {"three", false}, {"three", true}
+    };
+    json j_mmap(c_mmap); // only one entry for key "three" is used
+
+    // create an object from std::unordered_multimap
+    std::unordered_multimap<std::string, bool> c_ummap
+    {
+        {"one", true}, {"two", true}, {"three", false}, {"three", true}
+    };
+    json j_ummap(c_ummap); // only one entry for key "three" is used
+
+    // serialize the JSON objects
+    std::cout << j_object_t << '\n';
+    std::cout << j_map << '\n';
+    std::cout << j_umap << '\n';
+    std::cout << j_mmap << '\n';
+    std::cout << j_ummap << "\n\n";
+
+
+    // ===========
+    // array types
+    // ===========
+
+    // create an array from an array_t value
+    json::array_t array_value = {"one", "two", 3, 4.5, false};
+    json j_array_t(array_value);
+
+    // create an array from std::vector
+    std::vector<int> c_vector {1, 2, 3, 4};
+    json j_vec(c_vector);
+
+    // create an array from std::valarray
+    std::valarray<short> c_valarray {10, 9, 8, 7};
+    json j_valarray(c_valarray);
+
+    // create an array from std::deque
+    std::deque<double> c_deque {1.2, 2.3, 3.4, 5.6};
+    json j_deque(c_deque);
+
+    // create an array from std::list
+    std::list<bool> c_list {true, true, false, true};
+    json j_list(c_list);
+
+    // create an array from std::forward_list
+    std::forward_list<int64_t> c_flist {12345678909876, 23456789098765, 34567890987654, 45678909876543};
+    json j_flist(c_flist);
+
+    // create an array from std::array
+    std::array<unsigned long, 4> c_array {{1, 2, 3, 4}};
+    json j_array(c_array);
+
+    // create an array from std::set
+    std::set<std::string> c_set {"one", "two", "three", "four", "one"};
+    json j_set(c_set); // only one entry for "one" is used
+
+    // create an array from std::unordered_set
+    std::unordered_set<std::string> c_uset {"one", "two", "three", "four", "one"};
+    json j_uset(c_uset); // only one entry for "one" is used
+
+    // create an array from std::multiset
+    std::multiset<std::string> c_mset {"one", "two", "one", "four"};
+    json j_mset(c_mset); // both entries for "one" are used
+
+    // create an array from std::unordered_multiset
+    std::unordered_multiset<std::string> c_umset {"one", "two", "one", "four"};
+    json j_umset(c_umset); // both entries for "one" are used
+
+    // serialize the JSON arrays
+    std::cout << j_array_t << '\n';
+    std::cout << j_vec << '\n';
+    std::cout << j_valarray << '\n';
+    std::cout << j_deque << '\n';
+    std::cout << j_list << '\n';
+    std::cout << j_flist << '\n';
+    std::cout << j_array << '\n';
+    std::cout << j_set << '\n';
+    std::cout << j_uset << '\n';
+    std::cout << j_mset << '\n';
+    std::cout << j_umset << "\n\n";
+
+
+    // ============
+    // string types
+    // ============
+
+    // create string from a string_t value
+    json::string_t string_value = "The quick brown fox jumps over the lazy dog.";
+    json j_string_t(string_value);
+
+    // create a JSON string directly from a string literal
+    json j_string_literal("The quick brown fox jumps over the lazy dog.");
+
+    // create string from std::string
+    std::string s_stdstring = "The quick brown fox jumps over the lazy dog.";
+    json j_stdstring(s_stdstring);
+
+    // serialize the JSON strings
+    std::cout << j_string_t << '\n';
+    std::cout << j_string_literal << '\n';
+    std::cout << j_stdstring << "\n\n";
+
+
+    // ============
+    // number types
+    // ============
+
+    // create a JSON number from number_integer_t
+    json::number_integer_t value_integer_t = -42;
+    json j_integer_t(value_integer_t);
+
+    // create a JSON number from number_unsigned_t
+    json::number_integer_t value_unsigned_t = 17;
+    json j_unsigned_t(value_unsigned_t);
+
+    // create a JSON number from an anonymous enum
+    enum { enum_value = 17 };
+    json j_enum(enum_value);
+
+    // create values of different integer types
+    short n_short = 42;
+    int n_int = -23;
+    long n_long = 1024;
+    int_least32_t n_int_least32_t = -17;
+    uint8_t n_uint8_t = 8;
+
+    // create (integer) JSON numbers
+    json j_short(n_short);
+    json j_int(n_int);
+    json j_long(n_long);
+    json j_int_least32_t(n_int_least32_t);
+    json j_uint8_t(n_uint8_t);
+
+    // create values of different floating-point types
+    json::number_float_t v_ok = 3.141592653589793;
+    json::number_float_t v_nan = NAN;
+    json::number_float_t v_infinity = INFINITY;
+
+    // create values of different floating-point types
+    float n_float = 42.23;
+    float n_float_nan = 1.0f / 0.0f;
+    double n_double = 23.42;
+
+    // create (floating point) JSON numbers
+    json j_ok(v_ok);
+    json j_nan(v_nan);
+    json j_infinity(v_infinity);
+    json j_float(n_float);
+    json j_float_nan(n_float_nan);
+    json j_double(n_double);
+
+    // serialize the JSON numbers
+    std::cout << j_integer_t << '\n';
+    std::cout << j_unsigned_t << '\n';
+    std::cout << j_enum << '\n';
+    std::cout << j_short << '\n';
+    std::cout << j_int << '\n';
+    std::cout << j_long << '\n';
+    std::cout << j_int_least32_t << '\n';
+    std::cout << j_uint8_t << '\n';
+    std::cout << j_ok << '\n';
+    std::cout << j_nan << '\n';
+    std::cout << j_infinity << '\n';
+    std::cout << j_float << '\n';
+    std::cout << j_float_nan << '\n';
+    std::cout << j_double << "\n\n";
+
+
+    // =============
+    // boolean types
+    // =============
+
+    // create boolean values
+    json j_truth = true;
+    json j_falsity = false;
+
+    // serialize the JSON booleans
+    std::cout << j_truth << '\n';
+    std::cout << j_falsity << '\n';
+}
--- a/vendor/nlohmann/doc/examples/basic_json__CompatibleType.link
+++ b/vendor/nlohmann/doc/examples/basic_json__CompatibleType.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/pylFciQUhOx6zXW8"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/basic_json__CompatibleType.output
+++ b/vendor/nlohmann/doc/examples/basic_json__CompatibleType.output
@ -0,0 +1,39 @@
+{"one":1,"two":2}
+{"one":1,"three":3,"two":2}
+{"one":1.2,"three":3.4,"two":2.3}
+{"one":true,"three":false,"two":true}
+{"one":true,"three":false,"two":true}
+
+["one","two",3,4.5,false]
+[1,2,3,4]
+[10,9,8,7]
+[1.2,2.3,3.4,5.6]
+[true,true,false,true]
+[12345678909876,23456789098765,34567890987654,45678909876543]
+[1,2,3,4]
+["four","one","three","two"]
+["four","three","two","one"]
+["four","one","one","two"]
+["four","two","one","one"]
+
+"The quick brown fox jumps over the lazy dog."
+"The quick brown fox jumps over the lazy dog."
+"The quick brown fox jumps over the lazy dog."
+
+-42
+17
+17
+42
+-23
+1024
+-17
+8
+3.141592653589793
+null
+null
+42.22999954223633
+null
+23.42
+
+true
+false
--- a/vendor/nlohmann/doc/examples/basic_json__InputIt_InputIt.cpp
+++ b/vendor/nlohmann/doc/examples/basic_json__InputIt_InputIt.cpp
@ -0,0 +1,32 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json j_array = {"alpha", "bravo", "charly", "delta", "easy"};
+    json j_number = 42;
+    json j_object = {{"one", "eins"}, {"two", "zwei"}};
+
+    // create copies using iterators
+    json j_array_range(j_array.begin() + 1, j_array.end() - 2);
+    json j_number_range(j_number.begin(), j_number.end());
+    json j_object_range(j_object.begin(), j_object.find("two"));
+
+    // serialize the values
+    std::cout << j_array_range << '\n';
+    std::cout << j_number_range << '\n';
+    std::cout << j_object_range << '\n';
+
+    // example for an exception
+    try
+    {
+        json j_invalid(j_number.begin() + 1, j_number.end());
+    }
+    catch (json::invalid_iterator& e)
+    {
+        std::cout << e.what() << '\n';
+    }
+}
--- a/vendor/nlohmann/doc/examples/basic_json__InputIt_InputIt.link
+++ b/vendor/nlohmann/doc/examples/basic_json__InputIt_InputIt.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/KCfRvbW3QTvghlFb"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/basic_json__InputIt_InputIt.output
+++ b/vendor/nlohmann/doc/examples/basic_json__InputIt_InputIt.output
@ -0,0 +1,4 @@
+["bravo","charly"]
+42
+{"one":"eins"}
+[json.exception.invalid_iterator.204] iterators out of range
--- a/vendor/nlohmann/doc/examples/basic_json__basic_json.cpp
+++ b/vendor/nlohmann/doc/examples/basic_json__basic_json.cpp
@ -0,0 +1,17 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON array
+    json j1 = {"one", "two", 3, 4.5, false};
+
+    // create a copy
+    json j2(j1);
+
+    // serialize the JSON array
+    std::cout << j1 << " = " << j2 << '\n';
+    std::cout << std::boolalpha << (j1 == j2) << '\n';
+}
--- a/vendor/nlohmann/doc/examples/basic_json__basic_json.link
+++ b/vendor/nlohmann/doc/examples/basic_json__basic_json.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/TM0OkdSgEIGBDbrv"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/basic_json__basic_json.output
+++ b/vendor/nlohmann/doc/examples/basic_json__basic_json.output
@ -0,0 +1,2 @@
+["one","two",3,4.5,false] = ["one","two",3,4.5,false]
+true
--- a/vendor/nlohmann/doc/examples/basic_json__copyassignment.cpp
+++ b/vendor/nlohmann/doc/examples/basic_json__copyassignment.cpp
@ -0,0 +1,18 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json a = 23;
+    json b = 42;
+
+    // copy-assign a to b
+    b = a;
+
+    // serialize the JSON arrays
+    std::cout << a << '\n';
+    std::cout << b << '\n';
+}
--- a/vendor/nlohmann/doc/examples/basic_json__copyassignment.link
+++ b/vendor/nlohmann/doc/examples/basic_json__copyassignment.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/jWDJPXw490IFoVL1"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/basic_json__copyassignment.output
+++ b/vendor/nlohmann/doc/examples/basic_json__copyassignment.output
@ -0,0 +1,2 @@
+23
+23
--- a/vendor/nlohmann/doc/examples/basic_json__list_init_t.cpp
+++ b/vendor/nlohmann/doc/examples/basic_json__list_init_t.cpp
@ -0,0 +1,21 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json j_empty_init_list = json({});
+    json j_object = { {"one", 1}, {"two", 2} };
+    json j_array = {1, 2, 3, 4};
+    json j_nested_object = { {"one", {1}}, {"two", {1, 2}} };
+    json j_nested_array = { {{1}, "one"}, {{1, 2}, "two"} };
+
+    // serialize the JSON value
+    std::cout << j_empty_init_list << '\n';
+    std::cout << j_object << '\n';
+    std::cout << j_array << '\n';
+    std::cout << j_nested_object << '\n';
+    std::cout << j_nested_array << '\n';
+}
--- a/vendor/nlohmann/doc/examples/basic_json__list_init_t.link
+++ b/vendor/nlohmann/doc/examples/basic_json__list_init_t.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/FR2ImEj05R1bqqZ2"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/basic_json__list_init_t.output
+++ b/vendor/nlohmann/doc/examples/basic_json__list_init_t.output
@ -0,0 +1,5 @@
+{}
+{"one":1,"two":2}
+[1,2,3,4]
+{"one":[1],"two":[1,2]}
+[[[1],"one"],[[1,2],"two"]]
--- a/vendor/nlohmann/doc/examples/basic_json__moveconstructor.cpp
+++ b/vendor/nlohmann/doc/examples/basic_json__moveconstructor.cpp
@ -0,0 +1,17 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value
+    json a = 23;
+
+    // move contents of a to b
+    json b(std::move(a));
+
+    // serialize the JSON arrays
+    std::cout << a << '\n';
+    std::cout << b << '\n';
+}
--- a/vendor/nlohmann/doc/examples/basic_json__moveconstructor.link
+++ b/vendor/nlohmann/doc/examples/basic_json__moveconstructor.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/XTHN0lMT9QsmBcBy"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/basic_json__moveconstructor.output
+++ b/vendor/nlohmann/doc/examples/basic_json__moveconstructor.output
@ -0,0 +1,2 @@
+null
+23
--- a/vendor/nlohmann/doc/examples/basic_json__nullptr_t.cpp
+++ b/vendor/nlohmann/doc/examples/basic_json__nullptr_t.cpp
@ -0,0 +1,16 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // implicitly create a JSON null value
+    json j1;
+
+    // explicitly create a JSON null value
+    json j2(nullptr);
+
+    // serialize the JSON null value
+    std::cout << j1 << '\n' << j2 << '\n';
+}
--- a/vendor/nlohmann/doc/examples/basic_json__nullptr_t.link
+++ b/vendor/nlohmann/doc/examples/basic_json__nullptr_t.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/iCwvXJinCVY7q1vi"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/basic_json__nullptr_t.output
+++ b/vendor/nlohmann/doc/examples/basic_json__nullptr_t.output
@ -0,0 +1,2 @@
+null
+null
--- a/vendor/nlohmann/doc/examples/basic_json__size_type_basic_json.cpp
+++ b/vendor/nlohmann/doc/examples/basic_json__size_type_basic_json.cpp
@ -0,0 +1,18 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create an array by creating copies of a JSON value
+    json value = "Hello";
+    json array_0 = json(0, value);
+    json array_1 = json(1, value);
+    json array_5 = json(5, value);
+
+    // serialize the JSON arrays
+    std::cout << array_0 << '\n';
+    std::cout << array_1 << '\n';
+    std::cout << array_5 << '\n';
+}
--- a/vendor/nlohmann/doc/examples/basic_json__size_type_basic_json.link
+++ b/vendor/nlohmann/doc/examples/basic_json__size_type_basic_json.link
@ -0,0 +1 @@
+<a target="_blank" href="https://wandbox.org/permlink/BzyeWqt4uTQ2nbfx"><b>online</b></a>
--- a/vendor/nlohmann/doc/examples/basic_json__size_type_basic_json.output
+++ b/vendor/nlohmann/doc/examples/basic_json__size_type_basic_json.output
@ -0,0 +1,3 @@
+[]
+["Hello"]
+["Hello","Hello","Hello","Hello","Hello"]
--- a/vendor/nlohmann/doc/examples/basic_json__value.cpp
+++ b/vendor/nlohmann/doc/examples/basic_json__value.cpp
@ -0,0 +1,30 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON object with different entry types
+    json j =
+    {
+        {"integer", 1},
+        {"floating", 42.23},
+        {"string", "hello world"},
+        {"boolean", true},
+        {"object", {{"key1", 1}, {"key2", 2}}},
+        {"array", {1, 2, 3}}
+    };
+
+    // access existing values
+    int v_integer = j.value("integer", 0);
+    double v_floating = j.value("floating", 47.11);
+
+    // access nonexisting values and rely on default value
+    std::string v_string = j.value("nonexisting", "oops");
+    bool v_boolean = j.value("nonexisting", false);
+
+    // output values
+    std::cout << std::boolalpha << v_integer << " " << v_floating
+              << " " << v_string << " " << v_boolean << "\n";
+}
--- a/Show more
+++ b/Show more
				`@ -0,0 +1 @@`
				`<a target="_blank" href="https://wandbox.org/permlink/jhAlfAa9ZPKTp8JK"><b>online</b></a>`