1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // UNSUPPORTED: c++03, c++11, c++14
10 // <optional>
11 
12 // constexpr bool optional<T>::has_value() const noexcept;
13 
14 #include <optional>
15 #include <type_traits>
16 #include <cassert>
17 
18 #include "test_macros.h"
19 
main(int,char **)20 int main(int, char**)
21 {
22     using std::optional;
23     {
24         const optional<int> opt; ((void)opt);
25         ASSERT_NOEXCEPT(opt.has_value());
26         ASSERT_SAME_TYPE(decltype(opt.has_value()), bool);
27     }
28     {
29         constexpr optional<int> opt;
30         static_assert(!opt.has_value(), "");
31     }
32     {
33         constexpr optional<int> opt(0);
34         static_assert(opt.has_value(), "");
35     }
36 
37   return 0;
38 }
39