micropython/py/objstr.h

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typedef struct _mp_obj_str_t {
mp_obj_base_t base;
// XXX here we assume the hash size is 16 bits (it is at the moment; see qstr.c)
machine_uint_t hash : 16;
// len == number of bytes used in data, alloc = len + 1 because (at the moment) we also append a null byte
machine_uint_t len : 16;
const byte *data;
} mp_obj_str_t;
#define MP_DEFINE_STR_OBJ(obj_name, str) mp_obj_str_t obj_name = {{&mp_type_str}, 0, sizeof(str) - 1, (const byte*)str};
mp_obj_t mp_obj_str_format(uint n_args, const mp_obj_t *args);