... 标识符的名空间（Namespace of Identifiers) 重载赋值运算符（operator=()) 虚函数表VFT(Virtual Function Table) ...
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不能重载赋值运算符。
构造函数有三种情况，在重载赋值运算符时一定要分清楚。
As the construction function has three kinds of different conditions, assignment operator overriding must be given attention.
重载二元运算符时，也会隐式重载相应的赋值运算符(如果有)。
When a binary operator is overloaded, the corresponding assignment operator, if any, is also implicitly overloaded.
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