vector indicies walk in reverse

Change-Id: Iddc8a940601230f8b209c5601e4e5bd04b103c6a
Signed-off-by: Neale Ranns <neale.ranns@cisco.com>

diff --git a/src/vppinfra/vec_bootstrap.h b/src/vppinfra/vec_bootstrap.h
index 6db83f2..bff6889 100644 (file)
--- a/src/vppinfra/vec_bootstrap.h
+++ b/src/vppinfra/vec_bootstrap.h
@@ -191,6 +191,10 @@ for (var = vec_end (vec) - 1; var >= (vec); var--)
 /** \brief Iterate over vector indices. */
 #define vec_foreach_index(var,v) for ((var) = 0; (var) < vec_len (v); (var)++)
 
+/** \brief Iterate over vector indices (reverse). */
+#define vec_foreach_index_backwards(var,v) \
+  for ((var) = vec_len((v)) - 1; (var) >= 0; (var)--)
+
 #endif /* included_clib_vec_bootstrap_h */
 
 /*