Ah right. Clang will warn if you actually try to call such a () function with arguments: https://www.godbolt.org/z/qEa55PdG9 https://www.godbolt.org/z/qEa55PdG9

Ah right. Clang will warn if you actually try to call such a () function with arguments: https://www.godbolt.org/z/qEa55PdG9 https://www.godbolt.org/z/qEa55PdG9 Both GCC and MSVC don't care though.