From: Greg Colvin (greg_at_[hidden])
Date: 2000-08-24 12:17:41
From: Bill Wade <bill.wade_at_[hidden]>
> > From: David Abrahams [mailto:abrahams_at_[hidden]]
>
> > > struct Rule
> > > {
> > > unsigned long cost;
> > > const void* action;
> > > const char** symbols(){ return (const char**) (&action+1); }
> > > };
> >
> > Okay, but is this still a POD?
>
> Yes. The addition of a non-virtual member function (other than 'tors and
> maybe assignment, I don't remember) is not enough to turn a POD struct into
> a non-POD struct.
So this is a POD too?
struct Rule
{
unsigned long cost;
const void* action;
char& operator[](size_t i) { return ((char*)(&action+1))[i]; }
char operator[](size_t i) const { return ((char*)(&action+1))[i]; }
};
> > And if action were of type char instead of
> > const void*, then your symbols() array would most likely be misaligned.
>
> Correct. In that case you'd need to do something extra to ensure alignment.
Why? Doesn't char have minimal alignment?