**Link:** https://wg21.link/P2988R12 Feature-test macro (increased): ```C++ #define __cpp_lib_freestanding_optional 202506L #define __cpp_lib_optional 202506L ``` Note that `__cpp_lib_freestanding_optional` also relies on [P2407R5](https://wg21.link/P2407R5) (#105391).
Link: https://wg21.link/P2988R12
Feature-test macro (increased):
Note that
__cpp_lib_freestanding_optionalalso relies on P2407R5 (#105391).