如果不使用这两个选项，try和catch代码仍然可以执行，并且系统执行到throw语句时才会调用局部对象的析构函数。

Without either of these options, the try and catch code can still execute, and the system does not call the destructors of local objects up to the throw statement.

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用VC6的Debug的功能跟踪构造函数、析构函数和成员函数的执行顺序。

The function of using VC6 Debug trace constructor, destructor and member functions are executed.

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