Method MaybeCopyOnWrite

tensorflow/core/graph/graph.cc:222–227

}

void Node::MaybeCopyOnWrite() {
  // NodeProperties may be shared between Nodes. Make a copy if so.
  if (!props_.unique()) {
    props_ = std::make_shared<NodeProperties>(*props_);
  }
}

AttrValue* Node::AddAttrHelper(const string& name) {
  MaybeCopyOnWrite();