On Fri, Sep 14, 2018 at 10:46 PM Caio Marcelo de Oliveira Filho < caio.olive...@intel.com> wrote:
> Useful to walk the array removing elements by swapping them with the > last element. > --- > src/util/u_dynarray.h | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/src/util/u_dynarray.h b/src/util/u_dynarray.h > index 6bea481d44b..f74bfc7080b 100644 > --- a/src/util/u_dynarray.h > +++ b/src/util/u_dynarray.h > @@ -154,6 +154,12 @@ util_dynarray_trim(struct util_dynarray *buf) > for (type *elem = (type *)(buf)->data; \ > elem < (type *)((char *)(buf)->data + (buf)->size); elem++) > > +#define util_dynarray_foreach_reverse(buf, type, elem) \ > + if ((buf)->size > 0) \ > + for (type *elem = util_dynarray_top_ptr(buf, type); \ > + elem >= (type *)(buf)->data; \ > I think this works... I suppose it's theoretically possible that elem-- could underflow. However, the only way that could happen is if the element size is really large and the data pointer ends up being really low. > + elem--) > We could do "elem; elem = elem > (type *)(buf)->data ? elem - 1 : NULL"? Maybe that's more complicated than it's worth. Meh. Reviewed-by: Jason Ekstrand <ja...@jlekstrand.net> --Jason
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