Function isObjectRepresentableAsLongLong

src/object.cpp:453–461

}

int isObjectRepresentableAsLongLong(robj *o, long long *llval) {
    serverAssertWithInfo(NULL,o,o->type == OBJ_STRING);
    if (o->encoding == OBJ_ENCODING_INT) {
        if (llval) *llval = (long) ptrFromObj(o);
        return C_OK;
    } else {
        return isSdsRepresentableAsLongLong(szFromObj(o),llval);
    }
}

/* Optimize the SDS string inside the string object to require little space,
 * in case there is more than 10% of free space at the end of the SDS