tjstatic.h

/***************************************************************************
                          tjstatic.h  -  description
                             -------------------
    begin                : Sun Jul 7 2002
    copyright            : (C) 2000-2021 by Thies H. Jochimsen
    email                : thies@jochimsen.de
 ***************************************************************************/
 
/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef TJSTATIC_H
#define TJSTATIC_H
 
 
#include <tjutils/tjutils.h>
#include <tjutils/tjthread.h>
 
 
class Static {
 
 public:
 
  Static() {}
  virtual ~Static() {}
 
  // destroy all static objects manually
  static void destroy_all();
 
  static void append_to_destructor_list(Static* sp);
 
 protected:
 
  static STD_list<Static*>* destructor_list;
};
 
 
 
template<class T>
struct StaticAlloc : public virtual Static {
 
  StaticAlloc() {
  }
 
  ~StaticAlloc() {
    T::destroy_static();
  }
};
 
 
 
template<class T>
class StaticHandler {
 
 public:
  StaticHandler() {
    if(!staticdone) { // fast check
      staticdone=true; // must be assigned before call to T::init_static() to avoid infinite loops
      Static* sp=new StaticAlloc<T>;
      Static::append_to_destructor_list(sp);
      T::init_static();
    }
  }
 
 
 private:
  static bool staticdone;
 
};
 
#endif