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, c++14 11 // <optional> 12 13 // constexpr bool optional<T>::has_value() const noexcept; 14 15 #include <optional> 16 #include <type_traits> 17 #include <cassert> 18 19 #include "test_macros.h" 20 21 int main() 22 { 23 using std::optional; 24 { 25 const optional<int> opt; ((void)opt); 26 ASSERT_NOEXCEPT(opt.has_value()); 27 ASSERT_SAME_TYPE(decltype(opt.has_value()), bool); 28 } 29 { 30 constexpr optional<int> opt; 31 static_assert(!opt.has_value(), ""); 32 } 33 { 34 constexpr optional<int> opt(0); 35 static_assert(opt.has_value(), ""); 36 } 37 } 38
