Re: [Dev-C++] Conditions to Use Virtual Functions

[matheus r. <mfr...@gm...>]

The first use I see is when developing interfaces, a class with pure virtual
functions. The classic example is the Shape interface, with its draw method.
Then, classes like Rectangle, Triangles etc can implement this method. And
in a loop, you could have a vector of Shapes (sv), and something like this
to draw all shapes:

for_each(sv.begin(), sv.end(), std::mem_fun(&Shape::draw));

Also, many times a child class add functionality to an object. For example,
a MoverClass may have the function move as a member, which updates its
position. An AircraftClass might want to override this move function, to
update its aerodynamic data to, like this:

void AircraftClass::move(){
MoverClass::move();
// update aero data
}

My 2 cents.

2 Aug 2007 12:41:31 -0000, Peeyush Bishnoi <pee...@re...>:
>
>
> Hello All ,
>
> I have one very simple & important query.
> I want to know the conditions & circumstances when to use the Virtual
> Function in a Project.
>
> I know most of the thing about the Virtual Function like it is used to
> implement Run type Polymorphism , Virtual Function VTBL & VPTR etc. , but
> still i get confused how & when it is needed in a Project , & in what
> circumstances & condition should i used.
>
> Please feed me through the valuable suggestions.
>
> Thank you ,
>
>
> Regards
> Peeyush
>
>
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