Re: Operator Overload between different types

From:

"Mark Salsbery [MVP]" <MarkSalsbery[MVP]@newsgroup.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Tue, 4 Sep 2007 12:09:26 -0700

Message-ID:

<Ovksgcy7HHA.4436@TK2MSFTNGP03.phx.gbl>

What didn't work? Something like this should be fine (of course, you should
implement it to do something meaningful):

class Cat
{
public:
Cat() {}
};

class Dog
{
public:
Dog() {}

Dog operator+(const Cat &) {return *this;}
};
....
Dog dog;
Cat cat;
Dog dog2 = dog + cat;

Mark

--
Mark Salsbery
Microsoft MVP - Visual C++

"Marco Biagioni" <mbsoftware@interfree.it> wrote in message
news:D7223ABA-EBDA-4F7F-AE29-1F72C158E309@microsoft.com...

I'm trying to implement the overload for two different kinds of objects. I
tryed for example:

Dog1 + Dog2;
Dog Dog::operator+(Dog& s)
{

return this->nBau + s.nBau;
}
it works fine.
I need something...
Dog1 + Cat1;
??? Dog::operator+(Cat& s)
{

return ???;
}
How can i implement my overload between different types and what type of
object must return?
I can only compile my program only specifing "return 0" in overload
function but it doesn't work.
Maybe i must implement overload function as static function outside class
Dog?
Some help please.

My final need is doing something...

Dog1 = Dog1 + Cat1;
so
Dog1.operator = Dog1.operator+ Cat1;