C++20 Function for converting arbitrary structs to json without serialisers

[ptesavol]

I wrote a templated function nlohmann::json structToJson(anyStruct) that can convert arbitrary structs to nlohmann::json without the need of writing serialisers. Implementing the function was made possible by C++20 and boost::pfr. The function is still at proof-of-concept stage, but it can already convert quite complex nested structs that have maps and vectors of user-defined data types as members.

You can try it out with the Compiler Explorer at https://godbolt.org/z/TKEo65aje

It would be nice to have similar functionality in the library itself, but I understand that it might not be realistic because of the requirement for C++20 and boost::pfr

[nlohmann]

Very cool proof of concept - using boost::pfr with C++20 to auto-generate to_json for arbitrary structs is a neat way to cut down on boilerplate. Given the library stays header-only with no Boost dependency and supports pre-C++20 compilers, this is best kept as an external helper, but thanks for sharing the Compiler Explorer link!

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This reply was drafted by Claude Code on behalf of @nlohmann, as part of a review of open discussions.