in_place_t.pass.cpp revision 05fe12bc443092747eff13ddfdbddea1cfd6416d
1//===----------------------------------------------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is dual licensed under the MIT and the University of Illinois Open 6// Source Licenses. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9 10// <optional> 11 12// struct in_place_t{}; 13// constexpr in_place_t in_place{}; 14 15#include <optional> 16#include <type_traits> 17 18#if _LIBCPP_STD_VER > 11 19 20constexpr 21int 22test(const std::in_place_t&) 23{ 24 return 3; 25} 26 27#endif 28 29int main() 30{ 31#if _LIBCPP_STD_VER > 11 32 33 static_assert((std::is_class<std::in_place_t>::value), ""); 34 static_assert((std::is_empty<std::in_place_t>::value), ""); 35 36 static_assert(test(std::in_place) == 3, ""); 37#endif 38} 39