RE: [GD-General] Overhead of RTTI

[<ce...@ce...>]

Hey,

It might be a bad design, but now that I've hit this problem, I'd also
like to know why it happens and how much RTTI would *really* hurt. The
class hierarchy in discussion has a base Obect class that has a name
field and is virtually inherited by all the other classes in the
hierarchy. Now I have a Texture class and a RenderTarget class (buth
abstract), and in the implementation I have a (say) D3DTexture class
that inherits both Texture and RenderTarget. The problem is that the
RenderSystem class (the one that does the actual rendering) is pretty
abstracted itself so it works with Textures and renderTargets. At some
point I have to cast from Object to D3DTexture and there's where all
hell brakes loose. I can't even cast from void * to D3DTexture for that
matter (well, the void * was initially a RenderTarget cast of
D3DTexture, so yes, it is a whole madness). My bet is on dynamic_cast or
modifying the design (I'll probably choose the latter eventually). Seems
like hard abstraction would be way easier (and safer) with RTTI enabled.

Thanks again,
Adrian

-----Original Message-----
From: gam...@li...
[mailto:gam...@li...] On Behalf Of
Tom Forsyth
Sent: Tuesday, December 24, 2002 3:02 PM
To: gam...@li...
Subject: RE: [GD-General] Overhead of RTTI

It's usually far quicker and easier to code it yourself with a few
helper
functions, unless you actually need the full madness of RTTI.

Tom Forsyth - Muckyfoot bloke and Microsoft MVP.

This email is the product of your deranged imagination,
and does not in any way imply existence of the author.

> -----Original Message-----
> From: Adrian Cearnau [mailto:ce...@ce...]
> Sent: 24 December 2002 12:50
> To: gam...@li...
> Subject: [GD-General] Overhead of RTTI
> 
> 
> Hey everyone and merry X-Mas,
> 
> I'd like to know what the realistic overhead of enabling RTTI in a C++
> project is. Any opinions are welcome.
> 
> Thank you,
> Adrian 'cearny' Cearnau



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