py: Implement builtin reversed() function.

reversed function now implemented, and works for tuple, list, str, bytes
and user objects with __len__ and __getitem__.

Renamed mp_builtin_len to mp_obj_len to make it publically available (eg
for reversed).

1 files changed, 1 insertions, 0 deletions

diff --git a/py/builtin.h b/py/builtin.h
index 425cfec09..25edf3289 100644
--- a/py/builtin.h
+++ b/py/builtin.h
@@ -26,6 +26,7 @@
 
 mp_obj_t mp_builtin___import__(uint n_args, mp_obj_t *args);
 mp_obj_t mp_builtin_open(uint n_args, const mp_obj_t *args);
+mp_obj_t mp_builtin_len(mp_obj_t o);
 
 MP_DECLARE_CONST_FUN_OBJ(mp_builtin___build_class___obj);
 MP_DECLARE_CONST_FUN_OBJ(mp_builtin___import___obj);