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✨ added NLOHMANN_JSON_SERIALIZE_ENUM marco #1208

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Niels Lohmann
2018-10-26 14:48:20 +02:00
parent f102df3cba
commit ad639ad5e6
4 changed files with 180 additions and 0 deletions
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31
single_include/nlohmann/json.hpp
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@ -202,6 +202,37 @@ using json = basic_json<>;
#define JSON_HAS_CPP_14
#endif
/*!
@brief macro to briefly define a mapping between an enum and JSON
@macro NLOHMANN_JSON_SERIALIZE_ENUM
@since version 3.4.0
*/
#define NLOHMANN_JSON_SERIALIZE_ENUM(ENUM_TYPE, ...) \
template<typename BasicJsonType> \
inline void to_json(BasicJsonType& j, const ENUM_TYPE& e) \
{ \
static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!"); \
static const std::vector<std::pair<ENUM_TYPE, BasicJsonType>> m = __VA_ARGS__; \
auto it = std::find_if(m.cbegin(), m.cend(), \
[e](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
{ \
return ej_pair.first == e; \
}); \
j = ((it != m.cend()) ? it : m.cbegin())->second; \
} \
template<typename BasicJsonType> \
inline void from_json(const BasicJsonType& j, ENUM_TYPE& e) \
{ \
static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!"); \
static const std::vector<std::pair<ENUM_TYPE, BasicJsonType>> m = __VA_ARGS__; \
auto it = std::find_if(m.cbegin(), m.cend(), \
[j](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
{ \
return ej_pair.second == j; \
}); \
e = ((it != m.cend()) ? it : m.cbegin())->first; \
}
// Ugly macros to avoid uglier copy-paste when specializing basic_json. They
// may be removed in the future once the class is split.