P2674R1 `is_implicit_lifetime`

[StephanTLavavej]

WG21-P2674R1 is_implicit_lifetime

Feature-test macro:

#define __cpp_lib_is_implicit_lifetime 202302L

This requires compiler magic. 🪄

[StephanTLavavej]

Clang implemented __builtin_is_implicit_lifetime in llvm/llvm-project#101807 , but it's not available in Clang 19. I'm not sure if it will ship in Clang 20 or Clang 21.

[Mishura4]

Shipped in Clang 20 👀