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^^Sig doesn't give you the meta::info of the original function type out(in...), but rather its type alias. You can directly extract the info of the function type out(in...) with: if (std::meta::...

This behavior is currently implementation-defined. Per [meta.reflection.member.queries], nonstatic_data_members_of(r, ctx) (where r is the reflection of a class or namespace Q) returns reflections of ...

Another option that does not require consteval is to template the size of the string literal: struct Label { const char* msg; }; template <size_t N> constexpr Label label(const char (&...

This may not meet your use case, but I suspect it will. Rather than returning the value, you can stick within the spirit of the ref struct rules by consuming the value without it leaving the stack. ...

I don't think there is a (easy and flexible) way of accessing a ref struct property (in this reflection-like manner) without knowing the return type at compile time, via a type parameter. Honestly, ...

The first bug I can see is: the method you are looking for AddGeneralName does not exist, or it is non-public. But you are looking for this method as it was public, because the default for System.Type....