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instance.h

/*
 *   Copyright  2008 dragchan <zgchan317@gmail.com>
 *
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifndef INSTANCE_H
#define INSTANCE_H

#define DECLARE_INSTANCE(classname) \
public: \
      static classname *instance(); \
      static void uninstance(); \
protected: \
      classname(); \
      virtual ~classname(); \
private: \
      static classname *createInstance(); \
      static classname *mp##classname;

#define DEFINE_INSTANCE(classname) \
classname *classname::mp##classname = 0; \
 \
classname *classname::instance() \
{ \
      if (!mp##classname) { \
            mp##classname = createInstance(); \
      } \
       \
      return mp##classname; \
} \
 \
void classname::uninstance() \
{ \
      if (mp##classname) { \
            delete mp##classname; \
            mp##classname = 0; \
      } \
}

#define DEFINE_INSTANCE_DEFAULT(classname) \
DEFINE_INSTANCE(classname) \
 \
classname *classname::createInstance() \
{ \
      return new classname(); \
}

#endif

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