message_traits.hpp

/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * Copyright (C) 2025 Marco Craveiro <marco.craveiro@gmail.com>
 *
 * This program 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 of the License, or (at your option) any later
 * version.
 *
 * 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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 */
#ifndef ORES_COMMS_MESSAGING_MESSAGE_TRAITS_HPP
#define ORES_COMMS_MESSAGING_MESSAGE_TRAITS_HPP
 
#include <concepts>
#include "ores.comms/messaging/message_types.hpp"
 
namespace ores::comms::messaging {
 
template<typename Request>
struct message_traits {
    // Primary template is intentionally not defined.
    // Each request type must provide its own specialization.
    // This causes a compile-time error if a request is used without traits.
};
 
template<typename T>
concept has_message_traits = requires {
    typename message_traits<T>::request_type;
    typename message_traits<T>::response_type;
    { message_traits<T>::request_message_type } -> std::convertible_to<message_type>;
};
 
}
 
#endif