freestoremanager.h

#ifndef _FREE_STORE_MANAGER_
#define _FREE_STORE_MANAGER_

#include <iostream>

using namespace std;

class FreeStoreManager
{
  public:
         
   FreeStoreManager(int blockSize)
   {
     storePtrList_ = NULL;
     maxCount_ = 0;
         allocatedCount_ = 0;
         occupiedCount_ = 0;
         this->blockSize_ = blockSize;
   }

   ~FreeStoreManager()
   {
         if(storePtrList_ == NULL)
           return;
         for(int i=0;i<allocatedCount_;i++)
           delete [] storePtrList_[i];
         delete [] storePtrList_;
   }
          
         /* get the block size */
   int getBlockSize(){ return blockSize_; }

         /* get next available store ptr */       
   int* getStorePtr() {
         //     cout<<"came to get a new block.."<<endl;
     int *storePtr;
         if(allocatedCount_ == maxCount_)
           increaseMaxCount();
         if(allocatedCount_ == occupiedCount_)
         {
           storePtr = new int[blockSize_];
           storePtrList_[allocatedCount_++] = storePtr;
         }
     return storePtrList_[occupiedCount_++];
   }

   /* release a store ptr */
   void releaseStorePtr()
   {
         if(occupiedCount_ == 0)
           cout<<"Problem in freeStorePtr!!"<<endl<<"Nothing to free!"<<endl;
         occupiedCount_--;
   }

   /* release a store ptr */
   void releaseAllStorePtr()
   {
         //     cout<<"releasing all the blocks.."<<endl;
         occupiedCount_=0;
   }
        
  private:
        
   /* increase the max size */
   void increaseMaxCount()
   {
         maxCount_ = maxCount_*2+1;
         int **tmpPtrList = new int*[maxCount_];
         if(storePtrList_ != NULL)
         {
           for(int i=0;i<allocatedCount_;i++)
         tmpPtrList[i] = storePtrList_[i];
           delete storePtrList_;
         }
         storePtrList_ = tmpPtrList;
   }

  private:
        
   int maxCount_;
   int allocatedCount_;
   int occupiedCount_;
   int **storePtrList_;
   int blockSize_;
};


#endif

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