RE: SPAM-LOW: Re: [GD-General] Offset a void pointer

[Peter L. <pe...@to...>]

the other problem was that pointer arithmetic can't be done on a void* since
the size of the object it points to isn't defined. One of his casts let the
compiler treat it as a char* pointer - the other form did the arithmetic on
a void* and then cast it to a char*.

> -----Original Message-----
> From: gam...@li...
> [mailto:gam...@li...]On Behalf Of
> Richard Fabian
> Sent: Thursday, October 14, 2004 7:11 AM
> To: gam...@li...
> Subject: SPAM-LOW: Re: [GD-General] Offset a void pointer
>
>
> if you are referring to this:
>
> http://gcc.gnu.org/gcc-3.4/changes.html
> from the section starting:
> "The cast-as-lvalue extension has been removed for C++ and deprecated
> for C and Objective-C. In particular, code like this: "
>
> then that is just that GCC has caught up with MS compilers in
> dissallowing the implicit lvalue return of standard C style casts
>
> Still appears to be perfectly legal to cast to an explicit lvalue type...
>
> Please correct me if i am wrong on this... At least in my head it
> certainly seems to make no sense to take out casting to a modifiable
> type...
>
> Regarding Ola Olsson: static_cast is a little bit safer, as the types
> Cavey Gerard was referring to were reasonably compatible. AFAIK
> reinterpret_cast is used to allow you to do more "dodgy" casting, e.g.
> between a function pointer and a float, something which static_cast
> does not do...
> Again, please correct me if i am wrong.
>
>
> On Wed, 13 Oct 2004 13:42:53 +0200, Antoine Chavasse
> <a.c...@gm...> wrote:
> > On Wed, 13 Oct 2004 10:23:16 +0100, Richard Fabian
> <ra...@gm...> wrote:
> >
> > >
> > > 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.
> >
> > However, afaik using cast as lvalues isn't standard.
> > It's deprecated now in gcc.
> >
> >
> >
> >
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