pageframeselectionpolicy.h

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/*
 *  Copyright (C) 2004 Bregmasoft
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef ZYGOMA_PAGEFRAMESELECTIONPOLICY_H_ 
#define ZYGOMA_PAGEFRAMESELECTIONPOLICY_H_ 

#include <pageframetable.h>

namespace Zygoma
{
  class PageFrame;

  class PageFrameSelectionPolicy
  {
  public:
    virtual ~PageFrameSelectionPolicy() = 0;

    virtual PageFrameTable::FrameIndex
    selectUnusedFrame() const = 0;
    
    virtual PageFrameTable::FrameIndex
    selectReplacementFrame() const = 0;

  protected:
    const PageFrame&
    getFrame(PageFrameTable* pageFrameTable, PageFrameTable::FrameIndex frameIndex);
  };
} // namespace Zygoma

#endif // ZYGOMA_PAGEFRAMESELECTIONPOLICY_H_ 

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