InstancePool.h

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/****************************************************************************/
// A pool of resuable instances
/****************************************************************************/
// SUMO, Simulation of Urban MObility; see http://sumo.sourceforge.net/
// Copyright 2001-2010 DLR (http://www.dlr.de/) and contributors
/****************************************************************************/
//
//   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 InstancePool_h
#define InstancePool_h


// ===========================================================================
// included modules
// ===========================================================================
#ifdef _MSC_VER
#include <windows_config.h>
#else
#include <config.h>
#endif

#include <vector>
#include <algorithm>
#include <cassert>


// ===========================================================================
// class definitions
// ===========================================================================
template<typename T>
class InstancePool {
public:
    InstancePool(bool deleteOnQuit) : myDeleteOnQuit(deleteOnQuit) { }


    ~InstancePool() {
        typedef typename std::vector<T*>::iterator It;
        if (myDeleteOnQuit) {
            for (It i=myFreeInstances.begin(); i!=myFreeInstances.end(); i++) {
                delete *i;
            }
        }
    }


    T* getFreeInstance() {
        if (myFreeInstances.size()==0) {
            return 0;
        } else {
            T *instance = myFreeInstances.back();
            myFreeInstances.pop_back();
            return instance;
        }
    }


    void addFreeInstance(T *instance) {
        myFreeInstances.push_back(instance);
    }


    void addFreeInstances(const std::vector<T*> instances) {
        std::copy(instances.begin(), instances.end(),
                  std::back_inserter(myFreeInstances));
    }


private:
    std::vector<T*> myFreeInstances;

    bool myDeleteOnQuit;


};


#endif

/****************************************************************************/