Cannot call friend function on object which is not an instance of defining class
在不是定义类的实例的对象上不能调用友元函数
Requirements member function respectively, and a friend function to find area and circumference of a circle.
要求分别用成员函数和友元函数来求圆的面积和周长。
She cited several cinematic examples of black characters who function as the white leading ladys best friend or caretaker.
她举了几个电影中成为白人女主角良师益友的黑人角色。
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