std::optional support with NLOHMANN_DEFINE_TYPE_INTRUSIVE

[hacker-cb]

Hello!

Currentlystd::optional is not supported with NLOHMANN_DEFINE_TYPE_INTRUSIVE

Is there any roadmap to make it work without implementing custom to_json/from_json methods?

The next code produce compile error now:

struct NyClass {
    std::optional<std::string> baseValue;
    NLOHMANN_DEFINE_TYPE_INTRUSIVE(BaseClass, baseValue)
};

[nlohmann]

You have to define the conversion functions explicitly, see https://json.nlohmann.me/features/arbitrary_types/#how-do-i-convert-third-party-types - there is an example for boost::optional that you can adapt.

[hacker-cb]

Thank you for the fast response. I will try.