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 // UNSUPPORTED: c++98, c++03, c++11 11 // <optional> 12 13 // constexpr explicit optional<T>::operator bool() const noexcept; 14 15 #include <experimental/optional> 16 #include <type_traits> 17 #include <cassert> 18 main()19int main() 20 { 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 } 32