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// Copyright (C) 2020-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
// { dg-do compile { target c++17 } }
#include <optional>
template<bool B>
struct X
{
X() noexcept(B);
X(const X&) noexcept(B);
X& operator=(const X&) noexcept(B);
X(int) noexcept(B);
X& operator=(int) noexcept(false);
X(void*) noexcept(true);
X& operator=(void*) noexcept(B);
X(const X<!B>&) noexcept(B);
X& operator=(const X<!B>&) noexcept(B);
X(std::initializer_list<int>, int) noexcept(B);
};
using std::is_nothrow_assignable_v;
using Xyes = X<true>;
using Xno = X<false>;
using Oyes = std::optional<Xyes>;
using Ono = std::optional<Xno>;
static_assert( is_nothrow_assignable_v<Oyes, std::nullopt_t> );
static_assert( is_nothrow_assignable_v<Oyes, const Xyes&> );
static_assert( is_nothrow_assignable_v<Oyes, Xyes> );
static_assert( ! is_nothrow_assignable_v<Oyes, int> );
static_assert( is_nothrow_assignable_v<Oyes, void*> );
static_assert( is_nothrow_assignable_v<Oyes, const Ono&> );
static_assert( is_nothrow_assignable_v<Oyes, Ono> );
static_assert( is_nothrow_assignable_v<Ono, std::nullopt_t> );
static_assert( ! is_nothrow_assignable_v<Ono, const Xno&> );
static_assert( ! is_nothrow_assignable_v<Ono, Xno> );
static_assert( ! is_nothrow_assignable_v<Ono, int> );
static_assert( ! is_nothrow_assignable_v<Ono, void*> );
static_assert( ! is_nothrow_assignable_v<Ono, const Xyes&> );
static_assert( ! is_nothrow_assignable_v<Ono, Xyes> );
Xyes xyes;
Xno xno;
Oyes oyes;
Ono ono;
static_assert( noexcept(oyes.emplace()) );
static_assert( noexcept(oyes.emplace(xyes)) );
static_assert( noexcept(oyes.emplace(1)) );
static_assert( noexcept(oyes.emplace(nullptr)) );
static_assert( noexcept(oyes.emplace(xno)) );
static_assert( noexcept(oyes.emplace({1,2,3}, 1)) );
static_assert( ! noexcept(ono.emplace()) );
static_assert( ! noexcept(ono.emplace(xno)) );
static_assert( ! noexcept(ono.emplace(1)) );
static_assert( noexcept(ono.emplace(nullptr)) );
static_assert( ! noexcept(ono.emplace(xyes)) );
static_assert( ! noexcept(ono.emplace({1,2,3}, 1)) );
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