singletonholder.hpp

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/*
 *    Copyright (c) <2002-2004> <Jean-Philippe Barrette-LaPierre>
 *    
 *    Permission is hereby granted, free of charge, to any person obtaining
 *    a copy of this software and associated documentation files 
 *    (cURLpp), to deal in the Software without restriction, 
 *    including without limitation the rights to use, copy, modify, merge,
 *    publish, distribute, sublicense, and/or sell copies of the Software,
 *    and to permit persons to whom the Software is furnished to do so, 
 *    subject to the following conditions:
 *    
 *    The above copyright notice and this permission notice shall be included
 *    in all copies or substantial portions of the Software.
 *    
 *    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 *    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
 *    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 
 *    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 *    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 *    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#ifndef SINGLETON_HOLDER_HPP
#define SINGLETON_HOLDER_HPP

#include <cassert>

#include "CreationUsingNew.hpp"
#include "LifetimeDefault.hpp"
#include "LifetimeWithLongevity.hpp"
#include "../ThreadingSingle.hpp"

namespace utilspp
{
  template
  < class T,
    template < class > class CreationPolicy = utilspp::CreationUsingNew,
    template < class > class LifetimePolicy = utilspp::LifetimeDefault,
    template < class > class ThreadingModel = utilspp::ThreadingSingle >
  class SingletonHolder
  {
  public:
    //the accessor method.
    static T& instance();
    static void makeInstance();
    static void terminate();
         
  protected:
    //protected to be sure that nobody may create one by himself.
    SingletonHolder();
         
  private:
    static void destroySingleton();
         
  private:
    typedef typename ThreadingModel< T * >::VolatileType InstanceType;
    static InstanceType mInstance;
    static bool mDestroyed;
  };

}

#include "SingletonHolder.inl"

#endif