Re: pointer arithmetic for alignment on short or int boundry

[Andy Howell <spam-andy-be-howell-gone at austin dot rr dot com>]

Burak,

	Thanks. You saved me from having to find that "do-as-I-mean" compiler 
switch again.

Andy

> Try
>
> a = (char *)((unsigned)(a + 1) & (unsigned)((char*) -2))
>
> You can only add or subtract pointers for pointer arithmetic.
>
> Andy Howell wrote:
>
> > I need to calculate an address on a short or int boundry. For some 
> > reason this is not working:
> >
> > char *a;
> >
> > a = (a + 1) & ((char*) -2));
> >
> > Gcc 3.3 on Solaris complains:
> >
> > error: invalid operands of types `char*' and `
> >    char*' to binary `operator&'
> >
> > Why shouldn't I be able to mask off the low bit?
> >
> > Thanks,
> >
> >     Andy