A copy assignment operator is implemented by the compiler automatically unless you provide one.
拷贝赋值运算符是由编译器自动实现，除非你提供一个。
How to call to the copy constructor from the copy-assignment operator?
如何从复制赋值运算符调用复制构造函数？
Copy constructor or assignment operator?
复制构造函数或赋值操作符？
Copy constructor or assignment operator?
复制构造函数或赋值操作符？
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