//MemoryPool.h
//Lee Noll

#ifndef __MEMORY_POOL_H
#define __MEMORY_POOL_H

#ifndef _WIN32
#include <types/vxTypes.h>
#endif

//This must be the base class of all new'd objects

class CMemoryPool
{
private:
	CMemoryPool *m_pParent;
	void *		m_pFree;
	size_t		m_nCount;

	static void *		m_pTempThis;
	static CMemoryPool *m_pTempParent;
	static void *		m_pTempFree;
	static size_t		m_nTempCount;

	static CMemoryPool *MostRemovedAncestor(CMemoryPool *pParent);
	static void * Alloc(size_t stAllocateBlock, CMemoryPool *pParent);
	static size_t Align(size_t stAllocateBlock);

protected:
	void * Alloc(size_t stAllocateBlock);
	void Free(void *pvMem) {}

public:
	CMemoryPool();
	virtual ~CMemoryPool();

	//establish the Memory Pool for all subsequent allocations
	//these hide the global operator new
	void * operator new (size_t stAllocateBlock, size_t total);

	//allocate from the most removed ancestor's pool
	void * operator new (size_t stAllocateBlock, CMemoryPool *pParent);

	//doesn't do anything to reverse the second new, only the first one
	//this hides the global operator delete
	void operator delete (void *pvMem);
	void operator delete (void *pvMem, size_t total);
	void operator delete (void *pvMem, CMemoryPool *pParent);
};

#endif