Temporary workaround for private members access

include/aidge/graph/Node.hpp

@@ -33,7 +33,8 @@ class GraphView;
  * @brief Object carrying the topological information of the computational graph.
  */
 class Node : public std::enable_shared_from_this<Node> {
-private:
+//private:
+public: // TODO: workaround to make GraphView:clone() work, friend doesn't work because of forward declaration
   struct weakCompare {
       bool operator()(const std::weak_ptr<Aidge::GraphView>& a, const std::weak_ptr<Aidge::GraphView>& b) const {
           // Compare the content of the weak_ptrs
@@ -399,7 +400,8 @@ public:
     return node->clone();
   }
 
-  friend std::shared_ptr<GraphView> GraphView::clone(NodePtr(*cloneNode)(NodePtr)) const;
+  // TODO: does not work, friend requires full definition, but there is a circular dependency between Node and GraphView
+  //friend std::shared_ptr<GraphView> GraphView::clone(NodePtr(*cloneNode)(NodePtr)) const;
 
 private:
   ///////////////////////////////////////////////////////