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Tip of the Day
Language: C++
Expertise: Intermediate
Sep 5, 2000

Nested Classes and Friendship

When you declare a nested class as a friend of its containing class, place the friend declaration after the declaration of the nested class, not before:

 
class A // containing class
{
private:
 int i;
public:
 class B // nested class declared first
 {
  public:
  B(A & a) { a.i=0;}; // access a private member of class A
 };
 friend class B;// friend declaration after B's declaration
};

If you place the friend declaration before the nested class's declaration, the compiler will discard it as the friend class has not been seen yet.

Danny Kalev
 
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