py/objpolyiter: Add a new polyiter type with finaliser support.
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py/obj.h
3
py/obj.h
@ -677,6 +677,9 @@ extern const mp_obj_type_t mp_type_stringio;
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extern const mp_obj_type_t mp_type_bytesio;
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extern const mp_obj_type_t mp_type_reversed;
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extern const mp_obj_type_t mp_type_polymorph_iter;
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#if MICROPY_ENABLE_FINALISER
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extern const mp_obj_type_t mp_type_polymorph_iter_with_finaliser;
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#endif
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// Exceptions
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extern const mp_obj_type_t mp_type_BaseException;
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@ -51,3 +51,37 @@ const mp_obj_type_t mp_type_polymorph_iter = {
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.getiter = mp_identity_getiter,
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.iternext = polymorph_it_iternext,
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};
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#if MICROPY_ENABLE_FINALISER
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// mp_type_polymorph_iter_with_finaliser is a variant of the universal iterator
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// above which has a finaliser function attached. This function will be run when
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// the GC collects the iter object and can be used to close file handles etc.
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// Any instance should have these 3 fields at the beginning
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typedef struct _mp_obj_polymorph_iter_with_finaliser_t {
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mp_obj_base_t base;
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mp_fun_1_t iternext;
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mp_fun_1_t finaliser;
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} mp_obj_polymorph_with_finaliser_iter_t;
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STATIC mp_obj_t mp_obj_polymorph_iter_del(mp_obj_t self_in) {
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mp_obj_polymorph_with_finaliser_iter_t *self = MP_OBJ_TO_PTR(self_in);
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// Redirect call to object instance's iternext method
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return self->finaliser(self_in);
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(mp_obj_polymorph_iter_del_obj, mp_obj_polymorph_iter_del);
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STATIC const mp_rom_map_elem_t mp_obj_polymorph_iter_locals_dict_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&mp_obj_polymorph_iter_del_obj) },
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};
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STATIC MP_DEFINE_CONST_DICT(mp_obj_polymorph_iter_locals_dict, mp_obj_polymorph_iter_locals_dict_table);
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const mp_obj_type_t mp_type_polymorph_iter_with_finaliser = {
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{ &mp_type_type },
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.name = MP_QSTR_iterator,
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.getiter = mp_identity_getiter,
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.iternext = polymorph_it_iternext,
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.locals_dict = (mp_obj_dict_t *)&mp_obj_polymorph_iter_locals_dict,
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};
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#endif
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