coro_ptr.h

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// The MIT License (MIT)
//
// Copyright (c) 2021 Mateusz Pusz
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
 
#pragma once
 
#include <mp-coro/trace.h>
#include <coroutine>
#include <memory>
 
namespace mp_coro {
 
/// If the given promise object has an associated coroutine, destroy it.
struct coro_deleter {
    template <typename Promise>
    void operator()(Promise *promise) const noexcept {
        TRACE_FUNC();
        auto handle = std::coroutine_handle<Promise>::from_promise(*promise);
        if (handle)
            handle.destroy();
    }
};
 
/// RAII wrapper that destroys promise object's associated coroutine.
template <typename T>
using promise_ptr = std::unique_ptr<T, coro_deleter>;
 
} // namespace mp_coro