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// Copyright (C) 2020-2023 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>
#include <tuple>
template <bool B> struct abc {};
template <typename T>
struct future : public abc<std::is_trivially_constructible_v<std::tuple<T>>> {};
class mutation {
mutation();
friend class std::optional<mutation>;
};
using mutation_opt = std::optional<mutation>;
future<mutation_opt> foo();
template <typename Consumer> future<mutation_opt> consume_partitions() {
return foo();
}
future<mutation_opt> bar() { return consume_partitions<int>(); }
future<mutation> zed();
future<mutation> apply_counter_update() { return zed(); }
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