Move pubkey_set into auth.h header

This allows it to be brought in without the full lokimq.h header.

lokimq/auth.h

@@ -1,5 +1,8 @@
 #pragma once
 #include <iostream>
+#include <string>
+#include <cstring>
+#include <unordered_set>
 
 namespace lokimq {
 
@@ -29,4 +32,24 @@ struct Access {
         : auth{auth}, remote_sn{remote_sn}, local_sn{local_sn} {}
 };
 
+/// Simple hash implementation for a string that is *already* a hash-like value (such as a pubkey).
+/// Falls back to std::hash<std::string> if given a string smaller than a size_t.
+struct already_hashed {
+    size_t operator()(const std::string& s) const {
+        if (s.size() < sizeof(size_t))
+            return std::hash<std::string>{}(s);
+        size_t hash;
+        std::memcpy(&hash, &s[0], sizeof(hash));
+        return hash;
+    }
+};
+
+/// std::unordered_set specialization for specifying pubkeys (used, in particular, by
+/// LokiMQ::set_active_sns and LokiMQ::update_active_sns); this is a std::string unordered_set that
+/// also uses a specialized trivial hash function that uses part of the value itself (i.e. the
+/// pubkey) directly as a hash value.  (This is nice and fast for uniformly distributed values like
+/// pubkeys and a terrible hash choice for anything else).
+using pubkey_set = std::unordered_set<std::string, already_hashed>;
+
+
 }

lokimq/connections.h

@@ -1,6 +1,6 @@
 #pragma once
+#include "auth.h"
 #include "string_view.h"
-#include <cstring>
 
 namespace lokimq {
 
@@ -72,19 +72,6 @@ private:
     friend std::ostream& operator<<(std::ostream& o, const ConnectionID& conn);
 };
 
-/// Simple hash implementation for a string that is *already* a hash-like value (such as a pubkey).
-/// Falls back to std::hash<std::string> if given a string smaller than a size_t.
-struct already_hashed {
-    size_t operator()(const std::string& s) const {
-        if (s.size() < sizeof(size_t))
-            return std::hash<std::string>{}(s);
-        size_t hash;
-        std::memcpy(&hash, &s[0], sizeof(hash));
-        return hash;
-    }
-};
-
-
 } // namespace lokimq
 namespace std {
     template <> struct hash<lokimq::ConnectionID> {

lokimq/lokimq.h

@@ -86,14 +86,6 @@ static constexpr size_t MAX_COMMAND_LENGTH = 200;
 
 class CatHelper;
 
-/// std::unordered_set specialization for specifying pubkeys (used, in particular, by
-/// LokiMQ::set_active_sns and LokiMQ::update_active_sns); this is a std::string unordered_set that
-/// also uses a specialized trivial hash function that uses part of the value itself (i.e. the
-/// pubkey) directly as a hash value.  (This is nice and fast for uniformly distributed values like
-/// pubkeys and a terrible hash choice for anything else).
-using pubkey_set = std::unordered_set<std::string, already_hashed>;
-
-
 /**
  * Class that handles LokiMQ listeners, connections, proxying, and workers.  An application
  * typically has just one instance of this class.