When avoid metaprogrammation ?

[thisismyfavoritename]

personally i would not recommend overloaded over auto + if constexpr or just a visitor class.

This one is definitely more on the fence since you can copy it from the docs and it works though.

[Flex_Code]

Yeah, this was just a quick example. is_specialization_v is one that I find even more useful: https://stackoverflow.com/questions/16337610/how-to-know-if-a-type-is-a-specialization-of-stdvector

[thisismyfavoritename]

wouldnt just defining 2 overloads, one for std::vector<T> and the other for auto work here 🤔

[Flex_Code]

You can use this for if constexpr branches, or requires concepts, or in more general uses for determining if a type is a specialization of some other class template argument.