Re: [GD-General] Offset a void pointer

[Richard F. <ra...@gm...>]

i assume its not faster, but i personally think its better C++
(activley using these kinds of thing keeps your mind where it needs to
be to think out better solutions to more complex problems)

for example, I use ampersand suffixed return values for my container
classes that implement operator[]. that way you can assign stuff to
indexes.

so really it just boils down to what you're comfortable with, with te
caveat that maybe you should be comfortable with using cast to lvalue.


On Tue, 12 Oct 2004 10:04:35 -0700, Dan Thompson
<da...@ar...> wrote:
> Is there any problem with:
> 
> BufferPtr = (char*)BufferPtr + stride;
> 
> ? Compiles for me... certainly easier to read than (char*&)BufferPtr. Is
> one subtly faster than the in a way I'm not aware?
> 
> -Dan
> 
> 
> 
> 
> Richard Fabian wrote:
> 
> >just add an ampersand to your cast to make it a reference pointer not
> >just a pointer
> >
> >void *BufferPtr;
> >unnsigned int stride=5;
> >// should now compile
> >(char*&)BufferPtr+=stride;
> >
> >
> >On Tue, 12 Oct 2004 14:17:14 +0200, CAVEY GERARD <ger...@sg...> wrote:
> >
> >
> >>Hi
> >>
> >>I have little question
> >>It seems impossible to me to offset a void pointer with the += operator
> >>can someone explain me why ?
> >>I don t really understand the compiler here ... the left casting should
> >>give him the memory unit size , right?Is left casting forbidden?
> >>
> >>void *BufferPtr;
> >>unnsigned int stridde=5;
> >>//doesnt compile !
> >>(char*)BufferPtr+=stride;
> >>//will compile
> >>BufferPtr=(char*)BufferPtr+stride;
> >>
> >>Thanks
> >>GC.
> >>
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