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April 20th, 2010, 02:29 PM
#1
Help with friend function
I am learning C++ using the book "C++ Primer", and write some small code to test the concepts I am learning.
According to the book, a friend a class can be:
(1) a non-member function
(2) a member function of another class
(3) another class
I am testing how to write a friend of class A , which is a member function of class B. Below is my code:
Code:
class A;
class B{
public:
int getValue(A* pa) {
return pa->va_;
}
};
class A {
friend int B::getValue(A* pa);
public:
A():va_(1){}
private:
int va_;
};
I always got the error of: error C2027: use of undefined type 'A'
I used forward declaration of class A, and pointer to A in class B, why this does not work?
Thanks a lot for answering a newbie's question.
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