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/******************************************************************************\

* ___ __ *

* /\_ \ __/\ \ *

* \//\ \ /\_\ \ \____ ___ _____ _____ __ *

* \ \ \ \/\ \ \ '__`\ /'___\/\ '__`\/\ '__`\ /'__`\ *

* \_\ \_\ \ \ \ \L\ \/\ \__/\ \ \L\ \ \ \L\ \/\ \L\.\_ *

* /\____\\ \_\ \_,__/\ \____\\ \ ,__/\ \ ,__/\ \__/.\_\ *

* \/____/ \/_/\/___/ \/____/ \ \ \/ \ \ \/ \/__/\/_/ *

* \ \_\ \ \_\ *

* \/_/ \/_/ *

* *

* Copyright (C) 2011-2013 *

* Dominik Charousset <dominik.charousset@haw-hamburg.de> *

* *

* This file is part of libcppa. *

* libcppa is free software: you can redistribute it and/or modify it under *

* the terms of the GNU Lesser General Public License as published by the *

* Free Software Foundation; either version 2.1 of the License, *

* or (at your option) any later version. *

* *

* libcppa 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 Lesser General Public License for more details. *

* *

* You should have received a copy of the GNU Lesser General Public License *

* along with libcppa. If not, see <http://www.gnu.org/licenses/>. *

\******************************************************************************/

#ifndef CPPA_MATCH_HINT_HPP

#define CPPA_MATCH_HINT_HPP

namespace cppa {

/**

* @brief Optional return type for functors used in pattern matching

* expressions. This type is evaluated by the runtime system of libcppa

* and can be used to intentionally skip messages.

*/

struct skip_message_t { constexpr skip_message_t() { } };

/**

* @brief Tells the runtime system to skip a message when used as message

* handler, i.e., causes the runtime to leave the message in

* the mailbox of an actor.

*/

constexpr skip_message_t skip_message() {

return {};

}

// implemented in string_serialization.cpp

std::ostream& operator<<(std::ostream&, skip_message_t);

} // namespace cppa

#endif // CPPA_MATCH_HINT_HPP