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py/objtype: instance: Inherit protocol vtable from a base class. 

This allows to define an  abstract base class which would translate
C-level protocol to Python method calls, and any subclass inheriting
from it will support this feature. This in particular actually enables
recently introduced machine.PinBase class.
This commit is contained in:
Paul Sokolovsky 2016-06-19 00:01:59 +03:00
parent ad229477c6
commit 413c3e10b4
1 changed files with 5 additions and 1 deletions
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6
py/objtype.c
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@ -914,7 +914,11 @@ mp_obj_t mp_obj_new_type(qstr name, mp_obj_t bases_tuple, mp_obj_t locals_dict)
o->getiter = instance_getiter;
//o->iternext = ; not implemented
o->buffer_p.get_buffer = instance_get_buffer;
//o->stream_p = ; not implemented
// Inherit protocol from a base class. This allows to define an
// 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;
o->bases_tuple = MP_OBJ_TO_PTR(bases_tuple);
o->locals_dict = MP_OBJ_TO_PTR(locals_dict);