C++ try 块里 new 类对像构造异常时发生“回退”并对资源自动释放

       考虑如下代码：

void* operator new ( size_t size ) { printf ( "Malloc running! Size: %u/n", size ); return malloc ( size ); } void operator delete ( void* memblock ) { printf ( "Free running!/n" ); free ( memblock ); } class Fck { public: Fck () { printf ( "Fck Constructing/n" ); } ~Fck() { printf ( "Fck Destructing/n" ); } }; int _tmain(int argc, _TCHAR* argv[]) { delete new Fck (); return 0; } 

       运行之，控制台显示信息如下：