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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
// <optional>
// constexpr const T& optional<T>::value() const &;
#include <optional>
#include <type_traits>
#include <cassert>
using std::optional;
struct X
{
constexpr int test() const {return 3;}
int test() {return 4;}
};
int main(int, char**)
{
{
constexpr optional<X> opt;
static_assert(opt.value().test() == 3, "");
}
return 0;
}
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