| Message ID | 20180305231507.10386-12-mwilck@suse.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Delegated to: | christophe varoqui |
| Headers | show |
On 03/06/2018 12:14 AM, Martin Wilck wrote: > This is a handy helper for creating one vector from another, > mapping each element of the origin vector to an element of > the target vector with a given conversion function. It can > also be used to "concatenate" vectors by passing in a non-NULL first > argument. > > Signed-off-by: Martin Wilck <mwilck@suse.com> > Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com> > --- > libmultipath/vector.h | 29 +++++++++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > At one point we should consider moving vectors to lists ... Anyway: Reviewed-by: Hannes Reinecke <hare@suse.com> Cheers, Hannes
diff --git a/libmultipath/vector.h b/libmultipath/vector.h index 3f6e579ae19a..6018b57525bf 100644 --- a/libmultipath/vector.h +++ b/libmultipath/vector.h @@ -42,6 +42,35 @@ typedef struct _vector *vector; #define vector_foreach_slot_backwards(v,p,i) \ for (i = VECTOR_SIZE(v); i > 0 && ((p) = (v)->slot[i-1]); i--) +#define identity(x) (x) +/* + * Given a vector vec with elements of given type, + * return a newly allocated vector with elements conv(e) for each element + * e in vec. "conv" may be a macro or a function. + * Use "identity" for a simple copy. + */ +#define vector_convert(new, vec, type, conv) \ + ({ \ + const struct _vector *__v = (vec); \ + vector __t = (new); \ + type *__j; \ + int __i; \ + \ + if (__t == NULL) \ + __t = vector_alloc(); \ + if (__t != NULL) { \ + vector_foreach_slot(__v, __j, __i) { \ + if (vector_alloc_slot(__t) == NULL) { \ + vector_free(__t); \ + __t = NULL; \ + break; \ + } \ + vector_set_slot(__t, conv(__j)); \ + } \ + } \ + __t; \ + }) + /* Prototypes */ extern vector vector_alloc(void); extern void *vector_alloc_slot(vector v);