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Tip of the Day
Language: C++
Expertise: Beginner
Oct 9, 2000

Defining a Function with the 'friend' in a .cpp

Question:
With the following:

  friend int operator == (const cs303Point& point0, const cs303Point& point1);

in my .h file, how should the first line of the function definition look in the .cpp file?

Answer:
First of all, note that operator == returns a bool result rather than int. Therefore, it's advisable to declare the function like this:

friend bool operator==(const cs303Point& point0, 
const cs303Point& point1);

As for the definition: simply copy the prototype, omitting the 'friend' keyword and the semicolon, open a pair of braces, and fill them with code:

// in the .cpp file

bool operator==(const cs303Point& point0, 
const cs303Point& point1)
{
 return ((point0.x == point1.x)&&(point0.y==point1.y));
}
 

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