Method PrevDirection

library/cpp/containers/comptrie/opaque_trie_iterator.cpp:200–208

    }

    inline bool TFork::PrevDirection() {
        if (CurrentDirection == TDirection(0)) {
            return false;
        }
        do {
            --CurrentDirection;
        } while (CurrentDirection > 0 && !HasDirection(CurrentDirection));
        return HasDirection(CurrentDirection);
    }

    void TFork::LastDirection() {
        CurrentDirection = D_MAX;