snap_id_pool.h

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/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com.                */
 
#ifndef ENGINE_SERVER_SNAP_ID_POOL_H
#define ENGINE_SERVER_SNAP_ID_POOL_H
 
#include <cstdint>
#include <optional>
 
class CSnapIdPool
{
    enum
    {
        MAX_IDS = 32 * 1024,
    };
 
    // State of a Snap ID
    enum
    {
        ID_FREE = 0,
        ID_ALLOCATED = 1,
        ID_TIMED = 2,
    };
 
    class CID
    {
    public:
        short m_Next;
        short m_State; // 0 = free, 1 = allocated, 2 = timed
        int64_t m_Timeout;
    };
 
    CID m_aIds[MAX_IDS];
 
    int m_FirstFree;
    int m_FirstTimed;
    int m_LastTimed;
    int m_Usage;
    int m_InUsage;
 
public:
    CSnapIdPool();
 
    void Reset();
    void RemoveFirstTimeout();
    std::optional<int> NewId();
    void TimeoutIds();
    void FreeId(int Id);
};
 
#endif