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72 lines
3.5 KiB
C++
72 lines
3.5 KiB
C++
#pragma once
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// Credits to
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// https://www.kdab.com/jsonify-with-nlohmann-json/
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#ifdef HAS_NLOHMANN_JSON
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#pragma warning(push, 0)
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#include <nlohmann/json.hpp>
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#pragma warning(pop)
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#include <optional>
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// partial specialization (full specialization works too)
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namespace nlohmann
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{
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template<class T, typename BasicJsonType, detail::enable_if_t<detail::is_basic_json<BasicJsonType>::value, int> = 0>
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void optional_to_json(BasicJsonType& j, const char* name, const std::optional<T>& value)
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{
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if (value)
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j[name] = *value;
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}
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template<class T, typename BasicJsonType, detail::enable_if_t<detail::is_basic_json<BasicJsonType>::value, int> = 0>
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void optional_from_json(const BasicJsonType& j, const char* name, std::optional<T>& value)
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{
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const auto it = j.find(name);
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if (it != j.end() && !it->is_null())
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value = it->template get<T>();
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else
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value = std::nullopt;
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}
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template<typename> constexpr bool is_optional = false;
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template<typename T> constexpr bool is_optional<std::optional<T>> = true;
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template<typename T, typename BasicJsonType, detail::enable_if_t<detail::is_basic_json<BasicJsonType>::value, int> = 0>
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void extended_to_json(const char* key, BasicJsonType& j, const T& value)
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{
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if constexpr (is_optional<T>)
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nlohmann::optional_to_json(j, key, value);
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else
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j[key] = value;
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}
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template<typename T, typename BasicJsonType, detail::enable_if_t<detail::is_basic_json<BasicJsonType>::value, int> = 0>
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void extended_from_json(const char* key, const BasicJsonType& j, T& value)
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{
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if constexpr (is_optional<T>)
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nlohmann::optional_from_json(j, key, value);
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else
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j.at(key).get_to(value);
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}
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} // namespace nlohmann
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#define EXTEND_JSON_TO(v1) extended_to_json(#v1, nlohmann_json_j, nlohmann_json_t.v1);
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#define EXTEND_JSON_FROM(v1) extended_from_json(#v1, nlohmann_json_j, nlohmann_json_t.v1);
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#define NLOHMANN_DEFINE_TYPE_EXTENSION(Type, ...) \
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template<typename BasicJsonType, nlohmann::detail::enable_if_t<nlohmann::detail::is_basic_json<BasicJsonType>::value, int> = 0> \
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inline void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) \
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{ \
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NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(EXTEND_JSON_TO, __VA_ARGS__)) \
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} \
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template<typename BasicJsonType, nlohmann::detail::enable_if_t<nlohmann::detail::is_basic_json<BasicJsonType>::value, int> = 0> \
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inline void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) \
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{ \
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NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(EXTEND_JSON_FROM, __VA_ARGS__)) \
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}
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#endif
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