MemoryPool的简单实现（内存池）

这是可以时常切换的MemoryPool

#ifndef MEMORY_POOL
#define MEMORY_POOL

template<typename Ty>
class GD_MemoryPool
{
public:
enum{m_nBlock = 32};
GD_MemoryPool(size_t nBlock = m_nBlock)
{
m_Expand(nBlock);
}

~GD_MemoryPool()
{
if(pListMemoryPool != null)
{
GD_MemoryPool<Ty>* pList = pListMemoryPool;
while(pListMemoryPool)
{
pList = pListMemoryPool->pListMemoryPool;
delete []static_cast<byte*>(pList);
pListMemoryPool = pList;
}
}
}

void m_FreeMemory(void* pBlock)
{
if(pBlock != null)
{
GD_MemoryPool<Ty>* pRelease = static_cast<GD_MemoryPool<Ty>*>(pBlock);

pRelease->pListMemoryPool = pListMemoryPool;

pListMemoryPool = pRelease;
}
}

void* m_Allocator()
{

GD_MemoryPool<Ty>* pList = nullptr;
if(pListMemoryPool == null)
{
pList = m_Expand(m_nBlock);
}

pList = pListMemoryPool->pListMemoryPool;

return pList;

}

void* m_Allocator()
{

GD_MemoryPool<Ty>* pList = nullptr;
if(pListMemoryPool == null)
{
pList = m_Expand(m_nBlock);
}

pList = pListMemoryPool->pListMemoryPool;

return pList;

}

protected:

void* m_Expand(size_t nCount)
{
//size_t MaxByte to get sizeof(Ty)
size_t maxByte = sizeof(GD_MemoryPool<Ty*>);
GD_MemoryPool<Ty>* pPreList = static_cast<GD_MemoryPool<Ty>*>(static_cast<void*>(byte[maxByte]));

pListMemoryPool = pPreList;
GD_MemoryPool<Ty>* pPostList = nullptr;
for(size_t i = 0;i < nCount; ++i)
{
pPostList = static_cast<GD_MemoryPool<Ty>*>(static_cast<void*>(byte[maxByte]));

pPreList->PListMemoryPool = pPostList;

pPreList = pPostList;
}
}

private:GD_MemoryPool<Ty>* pListMemoryPool;

};

原理是：利用一个List把所有的Memory链接在一起；然后如果释放完一个Memory把它放在头结点的位置，然后每次去Memory都从头结点取；

的一个内存池就可以循环使用；

希望各位批评指正，我的程序是存在在单线程；然后但是还是没有特别好的管理内存