friend member function的意思|示意
美 / /
英 / /
友元函数
friend member function的网络常见释义
友元成员函数 4、友元成员函数（friend member function） 5、域类（domain class）
friend member function相关例句
When do I have to use a friend function rather than a member function?
当我需要使用友元函数而不是成员函数?。
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。