Method TreeDFIterator

source/opt/tree_iterator.h:56–59

  using value_type = NodeTy;

  explicit inline TreeDFIterator(NodePtr top_node) : current_(top_node) {
    if (current_ && current_->begin() != current_->end())
      parent_iterators_.emplace(make_pair(current_, current_->begin()));
  }

  // end() iterator.
  inline TreeDFIterator() : TreeDFIterator(nullptr) {}