mirror of https://github.com/oxen-io/oxen-core.git
53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
#pragma once
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// Adapts boost::serialization to support std::variant, serializing just as a boost::variant would
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// be serialized (so that the serialized boost::variant<T...> and std::variant<T...> values are
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// interchangeable).
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//
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#include <oxenc/variant.h>
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#include <boost/archive/archive_exception.hpp>
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#include <boost/serialization/split_free.hpp>
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#include <boost/serialization/serialization.hpp>
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#include <boost/serialization/nvp.hpp>
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namespace boost::serialization {
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template <class Archive, typename... T>
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void save(Archive& ar, std::variant<T...> const& v, unsigned int /*version*/) {
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int index = static_cast<int>(v.index());
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ar << boost::serialization::make_nvp("which", index);
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var::visit([&ar](const auto& v) { ar << boost::serialization::make_nvp("value", v); }, v);
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}
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template <class Archive, typename Variant, typename T, typename... More>
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void load_variant_impl(Archive& ar, int index, Variant& v) {
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if (index == 0) {
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T value;
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ar >> boost::serialization::make_nvp("value", value);
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v = value;
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ar.reset_object_address(&var::get<T>(v), &value);
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}
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else if constexpr (sizeof...(More) > 0) {
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return load_variant_impl<Archive, Variant, More...>(ar, index - 1, v);
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}
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}
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template <class Archive, typename... T>
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void load(Archive & ar, std::variant<T...>& v, const unsigned int version) {
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int index;
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ar >> boost::serialization::make_nvp("which", index);
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if (index < 0 || index >= (int) sizeof...(T))
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throw boost::archive::archive_exception{boost::archive::archive_exception::unsupported_version};
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load_variant_impl<Archive, std::variant<T...>, T...>(ar, index, v);
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}
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template <class Archive, typename... T>
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inline void serialize(Archive& ar, std::variant<T...>& v, const unsigned int file_version) {
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split_free(ar,v,file_version);
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}
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} // namespace boost::serialization
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