Re: CVS commit: src/usr.sbin/installboot

[David Laight <david%l8s.co.uk@localhost>]

On Mon, Oct 30, 2006 at 03:59:21PM +0000, Christos Zoulas wrote:
> >
> >I've also deliberatly used:
> >
> >#define x(y)   if (y); else {...}
> >
> >To avoid having to wrap the expansion inside do ... while (0);
> 
> How is one supposed to use this macro?

I remember now, it would be for single statement conditionals. eg:

#define return_nz(r) if (!r); else return (r)

Which is quite happy as:

        return_nz(a);
        if (b)
                return_nz(a);
        if (c)
                ...
        else
                return_nz(a);


        David

-- 
David Laight: david%l8s.co.uk@localhost