抽象属性或基类构造函数的参数?
初始化器在基类构造函数执行前被执行,它们被执行的顺序就是在类里被声明的顺序。
Initializers execute before the base class constructor for your type executes, and they are executed in the order the variables are declared in your class.
在派生类的构造函数调用基类指派算子不好?
C + + : Bad Form to Call Base Class Asssignment Operator in Derived Class Constructor?
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