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jsonwrap.hpp
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jsonwrap.hpp
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/*
* Copyright (C) 2020 Tusooa Zhu
*
* This file is part of libkazv.
*
* libkazv is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* libkazv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with libkazv. If not, see <https://www.gnu.org/licenses/>.
*/
#pragma once
#include <lager/debug/cereal/struct.hpp>
#include <nlohmann/json.hpp>
#include <immer/box.hpp>
namespace Kazv
{
using json = nlohmann::json;
class JsonWrap
{
// Cannot directly use box here, because it causes the resulting json
// to be wrapped into an array.
// https://github.com/arximboldi/immer/issues/155
struct Private
{
json j;
};
immer::box<Private> m_d;
public:
JsonWrap() : m_d(Private{json()}) {}
JsonWrap(json&& j) : m_d(Private{std::move(j)}) {}
JsonWrap(const json& j) : m_d(Private{j}) {}
const json &get() const { return m_d.get().j; }
operator json() const { return m_d.get().j; }
template <class Archive>
void save(Archive & ar, std::uint32_t const /*version*/) const {
ar( get().dump() );
}
template <class Archive>
void load(Archive & ar, std::uint32_t const /*version*/) {
std::string j;
ar( j );
m_d = immer::box<Private>(Private{json::parse(std::move(j))});
}
};
}
CEREAL_CLASS_VERSION(Kazv::JsonWrap, 0);
namespace nlohmann
{
template <>
struct adl_serializer<Kazv::JsonWrap> {
static void to_json(json& j, Kazv::JsonWrap w) {
j = w.get();
}
static void from_json(const json& j, Kazv::JsonWrap &w) {
w = Kazv::JsonWrap(j);
}
};
}
namespace Kazv
{
inline bool operator==(JsonWrap a, JsonWrap b)
{
return a.get() == b.get();
}
}

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