operator new 和operator delete的重载应用

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#include <iostream>using namespace std;/*    重载后的operator new实现的功能是，看一看刚刚回收的垃圾堆上还有没有位置，    有位置的话，就直接拿一块下来，用来初始化。*/class FreeListBase{public:    FreeListBase(): next(NULL){};    virtual ~FreeListBase();    void* operator new(size_t size);    void operator delete(void* pDeallocation);private:    static FreeListBase* m_pFreeList;    FreeListBase* next;};FreeListBase:: ~FreeListBase(){}void* FreeListBase:: operator new(size_t size){    if (m_pFreeList)    {        void* p = static_cast<void*>(m_pFreeList); //安全的C++类型转换        m_pFreeList = m_pFreeList->next;        return p;    }    else    {        return ::operator new(size);    }}void FreeListBase:: operator delete(void* pDeallocation){    FreeListBase* p = static_cast<FreeListBase*>(pDeallocation);    p->next = m_pFreeList;    m_pFreeList = p;}FreeListBase* FreeListBase:: m_pFreeList = NULL;int main(){    return 0;}

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