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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <memory>
#include <utility>
#include "mongo/base/disallow_copying.h"
#include "mongo/rpc/reply_interface.h"
#include "mongo/rpc/request_interface.h"
namespace mongo {
class Message;
namespace rpc {
/**
* A wrapper around an owned message that includes access to an associated
* ReplyInterface or RequestInterface.
*/
template <typename MessageViewType>
class UniqueMessage {
MONGO_DISALLOW_COPYING(UniqueMessage);
public:
UniqueMessage(std::unique_ptr<Message> message, std::unique_ptr<MessageViewType> view)
: _message{std::move(message)}
, _view{std::move(view)}
{}
#if defined(_MSC_VER) && _MSC_VER < 1900
UniqueMessage(UniqueMessage&& other)
: _message{std::move(other._message)}
, _view{std::move(other._view)}
{}
UniqueMessage& operator=(UniqueMessage&& other) {
_message = std::move(other._message);
_view = std::move(other._view);
return *this;
}
#else
UniqueMessage(UniqueMessage&&) = default;
UniqueMessage& operator=(UniqueMessage&&) = default;
#endif
const MessageViewType* operator->() const {
return _view.get();
}
const MessageViewType& operator*() const {
return *_view;
}
/**
* Releases ownership of the underlying message. The result of calling any other methods
* on the object afterward is undefined.
*/
std::unique_ptr<Message> releaseMessage() {
_view.reset();
return std::move(_message);
}
private:
std::unique_ptr<Message> _message;
std::unique_ptr<MessageViewType> _view;
};
using UniqueReply = UniqueMessage<ReplyInterface>;
using UniqueRequest = UniqueMessage<RequestInterface>;
} // namespace rpc
} // namespace mongo
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