/usr/include/caf/response_promise.hpp is in libcaf-dev 0.13.2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright (C) 2011 - 2015 *
* Dominik Charousset <dominik.charousset (at) haw-hamburg.de> *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#ifndef CAF_RESPONSE_PROMISE_HPP
#define CAF_RESPONSE_PROMISE_HPP
#include "caf/actor.hpp"
#include "caf/message.hpp"
#include "caf/actor_addr.hpp"
#include "caf/message_id.hpp"
namespace caf {
/**
* A response promise can be used to deliver a uniquely identifiable
* response message from the server (i.e. receiver of the request)
* to the client (i.e. the sender of the request).
*/
class response_promise {
public:
response_promise() = default;
response_promise(response_promise&&) = default;
response_promise(const response_promise&) = default;
response_promise& operator=(response_promise&&) = default;
response_promise& operator=(const response_promise&) = default;
response_promise(const actor_addr& from, const actor_addr& to,
const message_id& response_id);
/**
* Queries whether this promise is still valid, i.e., no response
* was yet delivered to the client.
*/
inline explicit operator bool() const {
// handle is valid if it has a receiver
return static_cast<bool>(m_to);
}
/**
* Sends `response_message` and invalidates this handle afterwards.
*/
void deliver(message response_message) const;
private:
actor_addr m_from;
actor_addr m_to;
message_id m_id;
};
} // namespace caf
#endif // CAF_RESPONSE_PROMISE_HPP
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