126 lines
2.8 KiB
C++
126 lines
2.8 KiB
C++
#pragma once
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/*
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对象内存申请器（单个对象申请）
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★采用对象池的技术队大量的小内存对象的申请优化★
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★！此内存管理器不是多线程安全的！★
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用于对连续的相同对象的小块内存申请进行优化。申请器只提供申请对象的功能并且能够将内存
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申请的效率进行最大化提升，提供释放对象所占用内存的功能。所有对象所占用的内存将在申请
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器销毁时才被释放。
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*/
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#include "ObjectAllocStat.hpp"
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template <class T>
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class CSingleObjectAllocator :
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protected wylib::container::CBaseList<T*>,
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public CObjectAllocatorStat
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{
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public:
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typedef wylib::container::CBaseList<T*> Inherited;
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typedef CObjectAllocatorStat Inherited2;
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private:
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struct DataBlock
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{
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DataBlock* pPrev;
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} *m_pDataBlock;
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public:
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enum
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{
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AllocObjectCountOneTime = 4096,
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};
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//申请属性指针
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T* allocObject()
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{
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T* result;
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INT_PTR nCount = this->count();
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if ( nCount <= 0 )
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{
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//static const INT_PTR nAllocCount = 4096;
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DataBlock *pBlock = (DataBlock*)malloc(sizeof(DataBlock) + sizeof(T) * AllocObjectCountOneTime);
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memset(pBlock, 0, sizeof(DataBlock) + sizeof(T) * AllocObjectCountOneTime);
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//#ifdef _ENABLE_OBJ_COUNT_STATICS_
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m_nAllocObjNum += AllocObjectCountOneTime;
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//#endif
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//将对象指针全部添加到空闲列表中
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result = (T*)(pBlock + 1);
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if ( this->maxCount() < AllocObjectCountOneTime )
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this->reserve(AllocObjectCountOneTime);
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for (INT_PTR i=0; i<AllocObjectCountOneTime; ++i)
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{
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//(*this)[i] = result;
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this->add( result ) ;
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result++;
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}
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nCount = AllocObjectCountOneTime;
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//标记上内存块的上一个内存块
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pBlock->pPrev = m_pDataBlock;
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m_pDataBlock = pBlock;
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}
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//返回列表中的最后一个对象
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//nCount--;
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//result = (*this)[nCount];
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result = (T*)this->pop() ;
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//trunc(nCount);
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//#ifdef _ENABLE_OBJ_COUNT_STATICS_
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m_nUsedObjNum++;
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//#endif
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return result;
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}
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//获得元素的数目
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inline INT_PTR GetCount()
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{
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return this->count();
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}
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//获得第index的指针
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T* GetIndex(INT_PTR nIndex)
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{
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if(nIndex <0 || nIndex >= this->count()) return NULL;
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return (*this)[nIndex];
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}
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//释放一个对象
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inline void freeObject(T* pObject)
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{
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//add(pObject);
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this->add(pObject);
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//#ifdef _ENABLE_OBJ_COUNT_STATICS_
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m_nUsedObjNum--;
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//#endif
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}
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//#ifdef _ENABLE_OBJ_COUNT_STATICS_
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CSingleObjectAllocator(LPCTSTR lpszDesc)
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:Inherited(), Inherited2(sizeof(T), 2, lpszDesc)
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{
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m_pDataBlock = NULL;
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}
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/*
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#else
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CSingleObjectAllocator(LPCTSTR lpszDesc):Inherited()
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{
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m_pDataBlock = NULL;
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}
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*/
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//#endif
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~CSingleObjectAllocator()
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{
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DataBlock *pBlock, *pPrev;
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pBlock = m_pDataBlock;
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while (pBlock)
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{
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pPrev = pBlock->pPrev;
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free(pBlock);
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pBlock = pPrev;
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}
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m_pDataBlock = NULL;
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}
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};
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