text: /****************************************************************************
  **
  ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
  ** All rights reserved.
  ** Contact: Nokia Corporation (qt-info@nokia.com)
  **
  ** This file is part of the QtCore module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL$
  ** GNU Lesser General Public License Usage
  ** This file may be used under the terms of the GNU Lesser General Public
  ** License version 2.1 as published by the Free Software Foundation and
  ** appearing in the file LICENSE.LGPL included in the packaging of this
  ** file. Please review the following information to ensure the GNU Lesser
  ** General Public License version 2.1 requirements will be met:
  ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
  **
  ** In addition, as a special exception, Nokia gives you certain additional
  ** rights. These rights are described in the Nokia Qt LGPL Exception
  ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  **
  ** GNU General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU General
  ** Public License version 3.0 as published by the Free Software Foundation
  ** and appearing in the file LICENSE.GPL included in the packaging of this
  ** file. Please review the following information to ensure the GNU General
  ** Public License version 3.0 requirements will be met:
  ** http://www.gnu.org/copyleft/gpl.html.
  **
  ** Other Usage
  ** Alternatively, this file may be used in accordance with the terms and
  ** conditions contained in a signed written agreement between you and Nokia.
  **
  **
  **
  **
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists for the convenience
  // of internal files.  This header file may change from version to version
  // without notice, or even be removed.
  //
  // We mean it.
  //
  
  #ifndef QSCOPEDPOINTER_P_H
  #define QSCOPEDPOINTER_P_H
  
  #include "QtCore/qscopedpointer.h"
  
  QT_BEGIN_HEADER
  QT_BEGIN_NAMESPACE
  QT_MODULE(Core)
  
  
  /* Internal helper class - exposes the data through data_ptr (legacy from QShared).
     Required for some internal Qt classes, do not use otherwise. */
  template <typename T, typename Cleanup = QScopedPointerDeleter<T> >
  class QCustomScopedPointer : public QScopedPointer<T, Cleanup>
  {
  public:
      explicit inline QCustomScopedPointer(T *p = 0)
          : QScopedPointer<T, Cleanup>(p)
      {
      }
  
      inline T *&data_ptr()
      {
          return this->d;
      }
  
      inline bool operator==(const QCustomScopedPointer<T, Cleanup> &other) const
      {
          return this->d == other.d;
      }
  
      inline bool operator!=(const QCustomScopedPointer<T, Cleanup> &other) const
      {
          return this->d != other.d;
      }
  
  private:
      Q_DISABLE_COPY(QCustomScopedPointer)
  };
  
  /* Internal helper class - a handler for QShared* classes, to be used in QCustomScopedPointer */
  template <typename T>
  class QScopedPointerSharedDeleter
  {
  public:
      static inline void cleanup(T *d)
      {
          if (d && !d->ref.deref())
              delete d;
      }
  };
  
  /* Internal.
     This class is basically a scoped pointer pointing to a ref-counted object
   */
  template <typename T>
  class QScopedSharedPointer : public QCustomScopedPointer<T, QScopedPointerSharedDeleter<T> >
  {
  public:
      explicit inline QScopedSharedPointer(T *p = 0)
          : QCustomScopedPointer<T, QScopedPointerSharedDeleter<T> >(p)
      {
      }
  
      inline void detach()
      {
          qAtomicDetach(this->d);
      }
  
      inline void assign(T *other)
      {
          if (this->d == other)
              return;
          if (other)
              other->ref.ref();
          T *oldD = this->d;
          this->d = other;
          QScopedPointerSharedDeleter<T>::cleanup(oldD);
      }
  
      inline bool operator==(const QScopedSharedPointer<T> &other) const
      {
          return this->d == other.d;
      }
  
      inline bool operator!=(const QScopedSharedPointer<T> &other) const
      {
          return this->d != other.d;
      }
  
  private:
      Q_DISABLE_COPY(QScopedSharedPointer)
  };
  
  
  QT_END_NAMESPACE
  QT_END_HEADER
  
  #endif
  