ObjectCache.h

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/* Frobby: Software for monomial ideal computations.
   Copyright (C) 2009 University of Aarhus
   Contact Bjarke Hammersholt Roune for license information (www.broune.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, see http://www.gnu.org/licenses/.
*/
#ifndef OBJECT_CACHE_GUARD
#define OBJECT_CACHE_GUARD
 
#include "ElementDeleter.h"
 
#include <vector>
 
template<class T>
class ObjectCache {
 public:
  ObjectCache();
 
  auto_ptr<T> newObject();
 
  template<class S>
  auto_ptr<T> newObjectCopy(const S& copyOf);
 
  template<class S>
  void freeObject(auto_ptr<S> object);
 
 private:
  vector<T*> _cache;
  ElementDeleter<vector<T*> > _cacheDeleter;
};
 
// The implementation has to be inline because we are using templates.
 
template<class T>
inline ObjectCache<T>::ObjectCache():
  _cache(),
  _cacheDeleter(_cache) {
}
 
template<class T>
auto_ptr<T> ObjectCache<T>::newObject() {
  if (_cache.empty())
    return auto_ptr<T>(new T());
 
  auto_ptr<T> object(_cache.back());
  _cache.pop_back();
  return object;
}
 
template<class T> template<class S>
auto_ptr<T> ObjectCache<T>::newObjectCopy(const S& copyOf) {
  if (_cache.empty())
    return auto_ptr<T>(new T(copyOf));
 
  auto_ptr<T> object(_cache.back());
  _cache.pop_back();
  *object = copyOf;
  return object;
}
 
template<class T> template<class S>
void ObjectCache<T>::freeObject(auto_ptr<S> object) {
  ASSERT(dynamic_cast<T*>(object.get()) != 0);
 
  auto_ptr<T> casted(static_cast<T*>(object.release()));
  noThrowPushBack(_cache, casted);
}
 
#endif