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// constexpr explicit optional<T>::operator bool() const noexcept; 13 14#include <experimental/optional> 15#include <type_traits> 16#include <cassert> 17 18int main() 19{ 20#if _LIBCPP_STD_VER > 11 21 using std::experimental::optional; 22 23 { 24 constexpr optional<int> opt; 25 static_assert(!opt, ""); 26 } 27 { 28 constexpr optional<int> opt(0); 29 static_assert(opt, ""); 30 } 31#endif // _LIBCPP_STD_VER > 11 32} 33