json_serialize_enum.hpp

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#pragma once
// copy of nlohmann's json serialize enum (include/nlohmann/detail/macro_scope.hpp), but without inlining
#define WMTK_NLOHMANN_JSON_SERIALIZE_ENUM(ENUM_TYPE, ...)                                            \
    void to_json(nlohmann::json& j, const ENUM_TYPE& e)                                   \
    {                                                                                           \
        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");          \
        static const std::pair<ENUM_TYPE, nlohmann::json> m[] = __VA_ARGS__;                     \
        auto it = std::find_if(std::begin(m), std::end(m),                                      \
                               [e](const std::pair<ENUM_TYPE, nlohmann::json>& ej_pair) -> bool  \
        {                                                                                       \
            return ej_pair.first == e;                                                          \
        });                                                                                     \
        j = ((it != std::end(m)) ? it : std::begin(m))->second;                                 \
    }                                                                                           \
    void from_json(const nlohmann::json& j, ENUM_TYPE& e)                                 \
    {                                                                                           \
        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");          \
        static const std::pair<ENUM_TYPE, nlohmann::json> m[] = __VA_ARGS__;                     \
        auto it = std::find_if(std::begin(m), std::end(m),                                      \
                               [&j](const std::pair<ENUM_TYPE, nlohmann::json>& ej_pair) -> bool \
        {                                                                                       \
            return ej_pair.second == j;                                                         \
        });                                                                                     \
        e = ((it != std::end(m)) ? it : std::begin(m))->first;                                  \
    }