QxSerialize_QSharedPointer.h

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/****************************************************************************
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** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
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#ifdef _QX_ENABLE_BOOST_SERIALIZATION
#ifndef _QX_SERIALIZE_QSHAREDPOINTER_H_
#define _QX_SERIALIZE_QSHAREDPOINTER_H_

#ifdef _MSC_VER
#pragma once
#endif

#include <boost/serialization/serialization.hpp>
#include <boost/serialization/split_free.hpp>
#include <boost/serialization/nvp.hpp>

#include <QtCore/qsharedpointer.h>
#include <QtCore/QWeakPointer>
#include <QtCore/qhash.h>

namespace boost {
namespace serialization {

template <class Archive, typename T>
inline void save(Archive & ar, const QSharedPointer<T> & t, const unsigned int file_version)
{
   Q_UNUSED(file_version);
   const T * ptr = t.data();
   ar << boost::serialization::make_nvp("qt_shared_ptr", ptr);
}

template <class Archive, typename T>
inline void load(Archive & ar, QSharedPointer<T> & t, const unsigned int file_version)
{
   Q_UNUSED(file_version);
   static QHash<void *, QWeakPointer<T> > listOfWeakPointers;
   T * ptr = NULL; ar >> boost::serialization::make_nvp("qt_shared_ptr", ptr);
   if (! ptr) { t = QSharedPointer<T>(); return; }

   void * pVoid = static_cast<void *>(ptr);
   QSharedPointer<T> pShared = (listOfWeakPointers.contains(pVoid) ? listOfWeakPointers.value(pVoid).toStrongRef() : QSharedPointer<T>());
   if (pShared) { t = pShared; return; }
   t = QSharedPointer<T>(ptr);
   QWeakPointer<T> pWeak = t;
   listOfWeakPointers.insert(pVoid, pWeak);

   static int iLoadCount = 0;
   iLoadCount++; if (iLoadCount <= 1000) { return; }
   QMutableHashIterator<void *, QWeakPointer<T> > itr(listOfWeakPointers);
   while (itr.hasNext()) { itr.next(); if (itr.value().isNull()) { itr.remove(); } }
   iLoadCount = 0;
}

template <class Archive, typename T>
inline void serialize(Archive & ar, QSharedPointer<T> & t, const unsigned int file_version)
{
   boost::serialization::split_free(ar, t, file_version);
}

} // namespace boost
} // namespace serialization

#endif // _QX_SERIALIZE_QSHAREDPOINTER_H_
#endif // _QX_ENABLE_BOOST_SERIALIZATION