Subj : Re: Need help, please!
To   : borland.public.cpp.borlandcpp
From : "Ed Mulroy [TeamB]" <dont_email_me@bitbuc.ket>
Date : Tue Nov 25 2003 06:14 pm

> ClassA operator-(const ClassA Obj1, const ClassA Obj2)

That is a problem.  Do not pass class instances by value.  Pass them by
reference or by const reference.  For example:

ClassA operator - (const ClassA& Obj1, const ClassA& Obj2)

That's all I see at first glance.  I'll look at it and get back to you.

> I dont know how to return you the favour!

There is a clear procedure for how you can pay for the help.  When you see
someone else burdened by a problem for which you know an answer, help him.
You might even feel good about what you've done and he will have been
helped - a situation where everybody wins.

..  Ed

> Bojidar Markov wrote in message
> news:3fc3d0e3@newsgroups.borland.com...
>
> 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!

.