Using template type in NLOHMANN_DEFINE_TYPE_* macros

[risa2000]

I am using extensively nlohmann::ordered_json type, and would like to benefit from the NLOHMANN_DEFINE_TYPE_* macros as well, but they seem to be hardcoded to nlohmann::json type. Looking at the definition:

json/include/nlohmann/detail/macro_scope.hpp

Line 393 in 5d27543

#define NLOHMANN_DEFINE_TYPE_INTRUSIVE(Type, ...) \

I guess I would try to redefine them as template function, following an example of NLOHMANN_JSON_SERIALIZE_ENUM as:

/*!
@brief macro
@def NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE
@since version 3.9.0
*/
#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(Type, ...)  \
    template<typename BasicJsonType>                                                            \
    inline void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) } \
    template<typename BasicJsonType>                                                            \
    inline void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM, __VA_ARGS__)) }

#define NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE_WITH_DEFAULT(Type, ...)  \
    template<typename BasicJsonType>                                                            \
    inline void to_json(BasicJsonType& nlohmann_json_j, const Type& nlohmann_json_t) { NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_TO, __VA_ARGS__)) } \
    template<typename BasicJsonType>                                                            \
    inline void from_json(const BasicJsonType& nlohmann_json_j, Type& nlohmann_json_t) { Type nlohmann_json_default_obj; NLOHMANN_JSON_EXPAND(NLOHMANN_JSON_PASTE(NLOHMANN_JSON_FROM_WITH_DEFAULT, __VA_ARGS__)) }
...

but for some reason it does not work.

Is there a way to easily fix it? Or should I simply try to define new macros with just the json type changed?

[gregmarr]

There's been some work done on this in #2843