idpool.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include "utilconfig.h"
#include <QByteArray>
#include <QSet>
#include <QIODevice>
#include <QDataStream>
#include <QtDebug>
 
namespace LC::Util
{
    template<typename T>
    class IDPool final
    {
        T CurrentID_;
    public:
        explicit IDPool (const T& id = T ())
        : CurrentID_ { id }
        {
        }

        T GetID ()
        {
            return ++CurrentID_;
        }

        void SetID (T id)
        {
            CurrentID_ = id;
        }

        void FreeID (T id)
        {
            Q_UNUSED (id)
        }

        QByteArray SaveState () const
        {
            QByteArray result;
            {
                QDataStream ostr (&result, QIODevice::WriteOnly);
                quint8 ver = 1;
                ostr << ver;
                ostr << CurrentID_;
            }
            return result;
        }

        void LoadState (const QByteArray& state)
        {
            if (state.isEmpty ())
                return;
 
            QDataStream istr (state);
            quint8 ver;
            istr >> ver;
            if (ver == 1)
                istr >> CurrentID_;
            else
                qWarning () << Q_FUNC_INFO
                        << "unknown version"
                        << ver
                        << ", not restoring state.";
        }
    };
}