Functions: store derived node tree and network in map for future access

source/blender/blenkernel/BKE_node_tree_multi_function.hh

@@ -56,16 +56,30 @@ class MFNetworkTreeMap {
    * Input sockets in a node tree can have multiple corresponding sockets in the generated
    * MFNetwork. This is because nodes are allowed to expand into multiple multi-function nodes.
    */
+  const DerivedNodeTree &m_tree;
+  fn::MFNetwork &m_network;
   Array<Vector<fn::MFSocket *, 1>> m_sockets_by_dsocket_id;
   Array<fn::MFOutputSocket *> m_socket_by_group_input_id;
 
  public:
-  MFNetworkTreeMap(const DerivedNodeTree &tree)
-      : m_sockets_by_dsocket_id(tree.sockets().size()),
+  MFNetworkTreeMap(const DerivedNodeTree &tree, fn::MFNetwork &network)
+      : m_tree(tree),
+        m_network(network),
+        m_sockets_by_dsocket_id(tree.sockets().size()),
         m_socket_by_group_input_id(tree.group_inputs().size(), nullptr)
   {
   }
 
+  const DerivedNodeTree &tree() const
+  {
+    return m_tree;
+  }
+
+  const fn::MFNetwork &network() const
+  {
+    return m_network;
+  }
+
   void add(const DSocket &dsocket, fn::MFSocket &socket)
   {
     BLI_assert(dsocket.is_input() == socket.is_input());

source/blender/blenkernel/intern/node_tree_multi_function.cc

@@ -217,7 +217,7 @@ MFNetworkTreeMap insert_node_tree_into_mf_network(fn::MFNetwork &network,
                                                   const DerivedNodeTree &tree,
                                                   ResourceCollector &resources)
 {
-  MFNetworkTreeMap network_map{tree};
+  MFNetworkTreeMap network_map{tree, network};
 
   CommonMFNetworkBuilderData common{resources, network, network_map, tree};