destructor member function 析构成员函数
Allows defining a destructor function that runs when an object is destroyed.
允许定义一个析构函数当对像崩溃的时候运行。
To create your constructor and destructor, declare two functions, then apply the constructor and destructor function attributes to them.
要创建constructor和destructor函数，则需要声明两个函数，然后对这两个函数应用constructor和destructor函数属性。
The constructor function is invoked immediately prior to main being called; and the destructor function is called when your application exits.
constructor 函数是在调用 main 函数之前调用的，而 destructor 函数则是在应用程序退出时调用的。
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