IDManager.h

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/*
 *  IDManager.h
 *
 *  Created on: 23/09/2022
 *  Author: Alexander Kuester
 *  Copyright (c) 2022, OpenTwin
 */
 
#pragma once
 
// OpenTwin header
#include "OTCore/OTAssert.h"
 
// C++ header
#include <map>
 
namespace ot {
 
    template<class T> class IDManager {
    public:
        IDManager();
        virtual ~IDManager();
 
        T grabNextID(void);
 
        void freeID(T _id);
 
    private:
        T                   m_currentId;
        std::map<T, bool>   m_occupiedIDs;
    };
 
    template <class T> IDManager<T>::IDManager() : m_currentId(0) {}
    template <class T> IDManager<T>::~IDManager() {}
 
    template <class T> T IDManager<T>::grabNextID(void) {
        T id = ++m_currentId;
        bool end = false;
        while (m_occupiedIDs.find(id) != m_occupiedIDs.end() || id == 0) {
            if (id == 0) {
                if (end) {
                    OTAssert(0, "There is no free ID available");
                    return 0;
                }
                else {
                    end = true;
                }
            }
            id++;
        }
        return id;
    }
 
    template <class T> void IDManager<T>::freeID(T _id) { m_occupiedIDs.erase(_id); }
}