Is it possible to declare all instantiated class of a template to be friend mutually?...

Friend function massacred by circular includes...

wxThread documentation example usefull or bad coding practice?...

using-declaration for friend function...

Nonmember friend function is always inline...

Friend class 'has no member named...'...

Overloading Operators in Templates Classes with Friend Operators...

Declaring a class template as a friend of a class template in C++...

In C++, why isn't it possible to friend a template class member function using the template type...

Forward declaration of template friend function...

Different behavior about c++ Friendship and inheritance from VC12 and VC14...

Declare many functions as friends of a class...

Accessing Protected Attribute of Template Class...

Incomplete type in friend function...

Superclass Setting Object of Subclass Data...

Does "friending" the base class in CRTP inheritance affect the child class as well?...

Can a friend class object access base class private members on a derived class object?...

c++ oop program doesn't give expected result...

Getting error message saying my class does not name a type when trying to overload the "+"...

Friend functions with templates...

Adding namespace removes friend access to class private members...

friend with class but can't access private members...

Why must a function, declared as friend in Class A, be defined as a public function in Class B?...

friend ref class?...

Return type match with auto and friend function...

Friend comparison and relational operators in C++ class template...

'friend' functions and << operator overloading: What is the proper way to overload an ...

c++ class function friend to another class...

Using friendship in test...

Inheritance and Friends: Safety mechanism?...