IdCache.hpp

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#pragma once

#include "Configuration.hpp"

template<typename TId>
class IdCache
{
    vector<TId>     m_unusedIds; 
    TId             m_highestId; 
    public:
        IdCache()
            : m_highestId(static_cast<TId>(1))
        { }

        TId createId()
        {
            if (m_unusedIds.empty())
                return m_highestId++;

            auto id = m_unusedIds.back();
            m_unusedIds.pop_back();
            return id;
        }
        void deleteId(TId id)
        {
            m_unusedIds.push_back(id);
        }

        void reset()
        {
            m_highestId = static_cast<TId>(1);
            m_unusedIds.clear();
        }
};