Befriending other class template instances with std:array parameter fails on MSVC...

Can function template be declared as friend without forward declaration in C++20?...

How to make google-test classes friends with my classes?...

How to friend a specific template specialization?...

My visitor class has private operator(), can I friend std::visit?...

C++ Template Class friend in CRTP pattern...

Why does the compiler accept a 'using' directive aliasing a template with an incomplete type...

clang c++ friend user defined literal declare failed...

Is it possible to friend a class in an unnamed namespace in C++?...

How to friend a function template inside a class template?...

Template friend function of two typenames for a template class...

How do I make this templated class be a friend of another class?...

Is there any way to access private fields of a struct from another package?...

Can a name introduced via using-directive or using-declaration be used as elaborated-type-specifier ...

friend function template with default template argument...

What's the scope of inline friend functions?...

Are inner classes in C++ automatically friends?...

PHP equivalent of friend or internal...

Redeclaration of explicitly defaulted comparison operator makes it undefined...

friend can't access private members using namespace...

What is wrong with making a unit test a friend of the class it is testing?...

friend class with limited access...

Template Friend Function of a Template Class (Friend with More Parameters)...

class friend function inside a namespace...

clean C++ granular friend equivalent? (Answer: Attorney-Client Idiom)...

Friend function template with non type paramer in outer namespace doesn't friend...

How to declare a class template as friend of other template class...

Declaring main as friend considered harmful?...

why explicit specialization of a friend function is allowed?...

friend in operator == or << when should i use it?...