packet_id_manager.hpp

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// Copyright Takatoshi Kondo 2020
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
 
#if !defined(MQTT_PACKET_ID_MANAGER_HPP)
#define MQTT_PACKET_ID_MANAGER_HPP
 
#include <mqtt/config.hpp> // should be top to configure variant limit
 
#include <mqtt/optional.hpp>
#include <mqtt/value_allocator.hpp>
 
namespace MQTT_NS {
 
template <typename PacketId>
class packet_id_manager {
    using packet_id_t = PacketId;
 
public:
 
    optional<packet_id_t> acquire_unique_id() {
        return va_.allocate();
    }
 
    bool register_id(packet_id_t packet_id) {
        return va_.use(packet_id);
    }
 
    void release_id(packet_id_t packet_id) {
        va_.deallocate(packet_id);
    }
 
    void clear() {
        va_.clear();
    }
 
private:
    value_allocator<packet_id_t> va_ {1, std::numeric_limits<packet_id_t>::max()};
};
 
} // namespace MQTT_NS
 
#endif // MQTT_PACKET_ID_MANAGER_HPP