std-optional.hpp
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std-optional.hpp
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	/*
	* This file is part of libkazv.
	* SPDX-FileCopyrightText: 2021 Tusooa Zhu <tusooa@kazv.moe>
	* SPDX-License-Identifier: AGPL-3.0-or-later
	*/


	#pragma once
	#include <libkazv-config.hpp>

	#include <boost/serialization/nvp.hpp>
	#include <boost/serialization/split_free.hpp>

	#include <optional>

	namespace boost::serialization
	{
	template<class Archive, class T>
	void save(Archive &ar, const std::optional<T> &o, const unsigned int /* version */)
	{
	auto hasValue = o.has_value();
	ar << BOOST_SERIALIZATION_NVP(hasValue);

	if (hasValue) {
	const auto &value = o.value();
	ar << BOOST_SERIALIZATION_NVP(value);
	}
	}

	template<class Archive, class T>
	void load(Archive &ar, std::optional<T> &o, const unsigned int /* version */)
	{
	auto hasValue = bool{};
	ar >> BOOST_SERIALIZATION_NVP(hasValue);

	o.reset();

	if (hasValue) {
	T value;
	ar >> BOOST_SERIALIZATION_NVP(value);
	o = std::move(value);
	}
	}

	template<class Archive,
	class T>
	inline void serialize(Archive &ar, std::optional<T> &o, const unsigned int version)
	{
	boost::serialization::split_free(ar, o, version);
	}
	}