[jcelerier]

It's possible to have some parts of what serde does if you restrict yourself to aggregates (no private members, no explicit constructors), e.g. your types are simple structs such as

     struct foo { int x; std::string label; };

Here it's possible to serialize/deserialize this structure in a generic way without having to annotate it - currently it's a bit complicated to implement so libraries help doing it (e.g.https://github.com/apolukhin/pfr_non_boost) but in 23 the missing language feature that makes the code trivial to write without any library should be there.