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