Subj : Re: Need help, please!
To   : borland.public.cpp.borlandcpp
From : "Bojidar Markov" <me@nosmap.com>
Date : Wed Nov 26 2003 12:00 am

Hi Ed,

The whole task is: "Predefine the operator "-" using member function and
friend function." That's all.

I tried to implement it using those two functions, but I cant with the
vectors.
If you help me get this working, I promise I will leave you! :) (I already
feel enough uncomfortable)
I just want a working example. Thats all.

Heres the code snipped:
//-------------------------------------------------------------------

//Global definition of the operator "-" which will be used later as friend
function of the class ClassA:
ClassA operator-(const ClassA Obj1, const ClassA Obj2)
{
    ClassA tmp;
    tmp.iMember = Obj1.iMember - Obj2.iMember;
    return tmp;
}

class ClassA
{
public:
    int iMember;

    //Example for operator "-" as member function:
    ClassA operator-( const ClassA Obj ) const
    {
        ClassA tmp;
        tmp.iMember = iMember - Obj.iMember;
        return tmp;
    }

    //And as friend function of the class ClassA:
    friend ClassA operator-(const ClassA Obj1, const ClassA Obj2);
}

//Usage:
ClassA OBJ1, OBJ2;
OBJ1.iMember = 5;
OBJ2.iMember = 3;

int iRes = OBJ1 - OBJ2; // iRes==2

//-------------------------------------------------------------------

I dont know how to return you the favour!

Regards,
Bojidar

.