Function setTypeDup

src/t_set.cpp:277–306

This is a helper function for the COPY command. * Duplicate a set object, with the guarantee that the returned object * has the same encoding as the original one. * * The resulting object always has refcount set to 1 */

 *
 * The resulting object always has refcount set to 1 */
robj *setTypeDup(robj *o) {
    robj *set;
    setTypeIterator *si;
    const char *elesds;
    int64_t intobj;

    serverAssert(o->type == OBJ_SET);

    /* Create a new set object that have the same encoding as the original object's encoding */
    if (o->encoding == OBJ_ENCODING_INTSET) {
        intset *is = (intset*)ptrFromObj(o);
        size_t size = intsetBlobLen(is);
        intset *newis = (intset*)zmalloc(size);
        memcpy(newis,is,size);
        set = createObject(OBJ_SET, newis);
        set->encoding = OBJ_ENCODING_INTSET;
    } else if (o->encoding == OBJ_ENCODING_HT) {
        set = createSetObject();
        dict *d = (dict*)ptrFromObj(o);
        dictExpand((dict*)ptrFromObj(set), dictSize(d));
        si = setTypeInitIterator(o);
        while (setTypeNext(si, &elesds, &intobj) != -1) {
            setTypeAdd(set, elesds);
        }
        setTypeReleaseIterator(si);
    } else {
        serverPanic("Unknown set encoding");
    }
    return set;
}

void saddCommand(client *c) {
    robj *set;