Class MutableFanoutView

tensorflow/core/grappler/utils/graph_view.h:172–200

MutableFanoutView is a helper class to represent fanins of a node. This holds a pointer to MutableGraphView, the index of the node from MutableGraphView being mutated, and the output index (hence is labeled as Fanout).

// a pointer to MutableGraphView, the index of the node from MutableGraphView
// being mutated, and the output index (hence is labeled as Fanout).
class MutableFanoutView
    : public internal::NodeIndexAndPortIndex<MutableNodeView,
                                             MutableGraphView> {
 public:
  MutableFanoutView() : NodeIndexAndPortIndex() {}

  MutableFanoutView(MutableGraphView* graph_view, int node_index,
                    int port_index)
      : NodeIndexAndPortIndex(graph_view, node_index, port_index) {}

  explicit MutableFanoutView(MutableGraphView* graph_view, int node_index,
                             int port_index, int fanout_index)
      : NodeIndexAndPortIndex(graph_view, node_index, port_index),
        fanout_index_(fanout_index) {}

  MutableFanoutView(MutableNodeView* node_view, int index);

 private:
  // Index of associated fanout in fanin's underlying MutableNodeView. For
  // regular fanins, this will be the index of the associated fanout in
  // MutableNodeView::regular_fanouts_by_port_[port_index]. For controlled
  // fanins, this will be the index of the associated fanout in
  // MutableNodeView::controlled_fanouts_.
  int fanout_index_ = internal::kMissingIndex;

  friend class MutableNodeView;
  friend class MutableGraphView;
  friend class Mutation;
};

// Mutable NodeView that holds a mutable NodeDef. This allows for lookups of
// fanins and fanouts, and traversals of the graph. Control dependencies will be