allocator.h

free library of genetic algorithms

/*
    cpplibga, free library of genetic algorithms.
    Copyright (C) 2003  Burger Y.A. (aka Jo Kruger)

    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

Contacts:

   address: planet Terra
   e-mail:  [e-mail]
            [e-mail]
*/

#ifndef __CPPLIBGA_ALLOCATOR_H__
#define __CPPLIBGA_ALLOCATOR_H__

#include <vector>
#include <algorithm>
#include <cpplibga/Predicates.h>

namespace cpplibga
{
    template<typename Solution, typename Fitness> class Allocator
    {
        public:
            typedef Solution* result_type;
            typedef Solution  solution_type; 
            
        private:
	    typedef std::vector<result_type>	 Container;
	    typedef typename Container::iterator ContainerIterator;
	    
	    Fitness *fitness;
	    Container buffer;
	
	public:

	    Allocator(Fitness *fitness) : fitness(fitness)
	    {
	    }
	    
	    ~Allocator()
	    {
		std::for_each(buffer.begin(), buffer.end(), Deleter());
	    }
      
	    Solution* New()
	    {
		if(!buffer.empty())
        	{
		    ContainerIterator i=buffer.end();
		    Solution* ptr=*--i;
		    buffer.erase(i);
		    return ptr;
		}
		else
		{
		    return new Solution(fitness);
		}
	    }

	    void Delete(Solution* ptr)
	    {
		buffer.push_back(ptr);
	    }
    };
}

#endif