c1d9bbc345
__bool__() and __len__() are just the same as __neg__() or __invert__(), and require efficient dispatching implementation (not requiring search/lookup). type->unary_op() is just the right choice for this short of adding standalone virtual method(s) to already big mp_obj_type_t structure.
40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
#include <stdlib.h>
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#include <stdint.h>
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#include "nlr.h"
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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#include "runtime0.h"
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typedef struct _mp_obj_none_t {
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mp_obj_base_t base;
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} mp_obj_none_t;
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static void none_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t self_in, mp_print_kind_t kind) {
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print(env, "None");
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}
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static mp_obj_t none_unary_op(int op, mp_obj_t o_in) {
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switch (op) {
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case RT_UNARY_OP_BOOL: return mp_const_false;
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default: return MP_OBJ_NULL; // op not supported for None
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}
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}
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const mp_obj_type_t none_type = {
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{ &mp_const_type },
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"NoneType",
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.print = none_print,
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.unary_op = none_unary_op,
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};
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static const mp_obj_none_t none_obj = {{&none_type}};
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const mp_obj_t mp_const_none = (mp_obj_t)&none_obj;
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// the stop-iteration object just needs to be something unique
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// it's not the StopIteration exception
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static const mp_obj_none_t stop_it_obj = {{&none_type}};
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const mp_obj_t mp_const_stop_iteration = (mp_obj_t)&stop_it_obj;
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