idpool.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Boost Software License - Version 1.0 - August 17th, 2003
 *
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
 * a source language processor.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 **********************************************************************/
 
#pragma once
 
#include "utilconfig.h"
#include <QByteArray>
#include <QSet>
#include <QDataStream>
#include <QtDebug>
 
namespace LC
{
namespace Util
{
    template<typename T>
    class IDPool
    {
        T CurrentID_;
    public:
        IDPool (const T& id = T ())
        : CurrentID_ (id)
        {
        }
 
        virtual ~IDPool ()
        {
        }
 
        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.";
        }
    };
}
}