Questions tagged [friend]

In object-oriented programming, friend refers to a method or class that has access to some non-public aspects of a particular class.

Different programming languages use the friend keyword differently. Make sure it is clear which language you are asking about.

1518 questions

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Why is it possible to place friend function definitions inside of a class definition?

Is it not supposed for a friend function to be explicitly defined outside of a class ? If so why can i declare a friend function inside a class definition just like any member function ? What is this ? Is it only OK with some operators such as <…

c++ operator-overloading friend

asked Jul 07 '13 at 13:25

Hossein

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How to propagate friend for derived classes

I want to have a class hierarchy and be able to create objects from it only inside a Factory. Example: class Base { protected: Base(){}; virtual void Init(){}; friend class Factory; }; class SomeClass : public Base { …

c++ friend

asked Dec 17 '12 at 14:46

Mircea Ispas

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3 answers

Can we increase the re-usability of this key-oriented access-protection pattern?

Can we increase the re-usability for this key-oriented access-protection pattern: class SomeKey { friend class Foo; // more friends... ? SomeKey() {} // possibly non-copyable too }; class Bar { public: void…

c++ design-patterns idioms friend access-protection

asked Jul 24 '10 at 11:27

Georg Fritzsche

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2 answers

Befriending a template template parameter

I've got a class template with a template template parameter, and I want to declare this parameter (that is, all of its specializations) as a friend. But I can't find the correct syntax. template