How can I access a protected constructor from a friend function?...

Can a friend of A<T> be also a friend of A<A<T>>?...

Friend function is not accessing private members of another friend class...

Friend functions and derived classes...

Why f1 is found but f2 not?...

My ostream and istream friend function can't access private class members...

c++ how to properly declare friend class method of another class...

Member function of a class as friend to another class...

Friend operators for template class...

Friend function haven't got access to private members...

About the return type of an unbound template friend function of a template class...

Why can't I access the private variable of a class after defining a friend function?...

Trying to befriend a function of Derived in Base - Why doesn't it work?...

Is there any way to declare mutual friend functions for two classes...

Operator overloading: calling friend function from member function...

Why is including implementation for a friend function that uses template parameters inside of a temp...

How do I declare a template friend function that is type-specific in my template class?...

Operator overloading in Fortran with no object creation such as in friend functions (C++)...

Why LNK1120 & LNK2019 appears in case of template and friend function...

About friend function in C++...

clang/g++ difference with friend function...

Friending template function from multiple classes...

forward declaration is not accepted...

Bug of gcc? Access control issue about friend function in template class...

friend function and copy constructors...

Redefinition of a class in C++...

Whether to go for a member function or friend function when the function is supposed to change state...

Accessing protected members of derived class with CRTP...

Friend function that takes 2 classes in parameters - 'Class' not defined...

accessing member function from an object inside a friend function...