Function setTypeRandomElement

src/t_set.cpp:211–223

Return random element from a non empty set. * The returned element can be an int64_t value if the set is encoded * as an "intset" blob of integers, or an SDS string if the set * is a regular set. * * The caller provides both pointers to be populated with the right * object. The return value of the function is the object->encoding * field of the object and is used by the caller to check if t

 * be NULL since the function will try to defensively populate the non
 * used field with values which are easy to trap if misused. */
int setTypeRandomElement(robj *setobj, sds *sdsele, int64_t *llele) {
    if (setobj->encoding == OBJ_ENCODING_HT) {
        dictEntry *de = dictGetFairRandomKey((dict*)setobj->m_ptr);
        *sdsele = (sds)dictGetKey(de);
        *llele = -123456789; /* Not needed. Defensive. */
    } else if (setobj->encoding == OBJ_ENCODING_INTSET) {
        *llele = intsetRandom((intset*)setobj->m_ptr);
        *sdsele = NULL; /* Not needed. Defensive. */
    } else {
        serverPanic("Unknown set encoding");
    }
    return setobj->encoding;
}

int setTypeRandomElement(robj_roptr setobj, const char **sdsele, int64_t *llele)
{