Why can't this friend function access the private variables?
为什么这不可以友元函数访问私有变量？
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?。
Is it possible to make a template function friend to a template Specialization Class?
有可能使一个模板函数的朋友一个专门化类模板吗？
Is it possible to make a template function friend to a template Specialization Class?
有可能使一个模板函数的朋友一个专门化类模板吗？
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