Method NextDirection

library/cpp/containers/comptrie/opaque_trie_iterator.cpp:193–198

    }

    inline bool TFork::NextDirection() {
        do {
            ++CurrentDirection;
        } while (CurrentDirection < D_MAX && !HasDirection(CurrentDirection));
        return CurrentDirection < D_MAX;
    }

    inline bool TFork::PrevDirection() {
        if (CurrentDirection == TDirection(0)) {