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py/objtype: Inherit protocol vtable from base class only if it exists.

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This commit is contained in:
Paul Sokolovsky 2016-06-19 00:56:06 +03:00
parent efee577318
commit c7fba524cb
1 changed files with 3 additions and 1 deletions
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4
py/objtype.c
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@ -918,7 +918,9 @@ mp_obj_t mp_obj_new_type(qstr name, mp_obj_t bases_tuple, mp_obj_t locals_dict)
// abstract base class which would translate C-level protocol to
// Python method calls, and any subclass inheriting from it will
// support this feature.
o->protocol = ((mp_obj_type_t*)MP_OBJ_TO_PTR(items[0]))->protocol;
if (len > 0) {
o->protocol = ((mp_obj_type_t*)MP_OBJ_TO_PTR(items[0]))->protocol;
}
o->bases_tuple = MP_OBJ_TO_PTR(bases_tuple);
o->locals_dict = MP_OBJ_TO_PTR(locals_dict);