Default copy constructor does a very simple operation, they will do a bit-wise (member-wise) copy of an object, which means that the object will be copied bit by bit.
如果程序员没有提供拷贝构造函数，那么编译器会自动生成默认的拷贝构造函数。默认的拷贝构造函数会执行简单的操作，即按位拷贝对象。
Default copy constructor does a very simple operation, they will do a bit-wise (member-wise) copy of an object, which means that the object will be copied bit by bit.
如果程序员没有提供拷贝构造函数，那么编译器会自动生成默认的拷贝构造函数。默认的拷贝构造函数会执行简单的操作，即按位拷贝对象。
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