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
20int 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

source code of libcxx/test/std/utilities/optional/optional.object/optional.object.observe/has_value.pass.cpp