ObjectPool.h

// Copyright (C) 1999 Jean-Marc Valin

#ifndef OBJECT_POOL_H
#define OBJECT_POOL_H

#include <vector>
#include "multithread.h"

namespace FD {

#define MAX_STORE 100

template <class T>
class ObjectPool {
  protected:
   static std::vector <T *> stack;
   static FastMutex mutex;
  public:
   ObjectPool() 
   {
      //Do not put anything there... everything is static!
   }

   ~ObjectPool() 
   {
      //Do not put anything there... everything is static!
   }

   static T *alloc()
   {
      mutex.lock();
      if (stack.size())
      {
         T *ret = stack.back();
         stack.pop_back();
         ret->ref();
         mutex.unlock();
         return ret;
      } else {
         mutex.unlock();
         return new T;
      }
   }

   static void release(T *obj)
   {
      mutex.lock();
      if (stack.size() > MAX_STORE)
      {
         delete obj;
      } else {
         stack.push_back(obj);
      }
      mutex.unlock();
   }

};
}//namespace FD
#endif

---