//===----------------------------------------------------------------------===//
//
// 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 optional(in_place_t);
// Test that the SFINAE "is_constructible<value_type>" isn't evaluated by the
// in_place_t constructor with no arguments when the Clang is trying to check
// copy constructor.
#include <optional>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "archetypes.h"
using std::optional;
struct Wrapped {
struct Inner {
bool Dummy = true;
};
std::optional<Inner> inner;
};
int main(int, char**) {
static_assert(std::is_default_constructible<Wrapped::Inner>::value, "");
Wrapped w;
w.inner.emplace();
assert(w.inner.has_value());
return 0;
}