[libcxx-commits] [libcxx] [libc++][NFC] Use `if constexpr` instead of SFINAE to simplify shared_ptr (PR #113495)

[Nikolas Klauser via libcxx-commits]

philnik777 wrote:

> @philnik777 This doesn't seem to work in C++03 mode. I thought you mentioned something along the lines that this should be working in all standard modes. Did I invent that?

Eh, I think you invented that. Anything `constexpr` doesn't work in C++03 mode. Attributes and lambdas (in new versions of clang) work in C++03 though. FWIW this is one of the simplifications we could do all over the code base when we split C++03 and non-C++03 code.

https://github.com/llvm/llvm-project/pull/113495