I did it! i read replace!

src/graph/GraphView.cpp

@@ -1125,6 +1125,7 @@ bool Aidge::GraphView::replace(const std::shared_ptr<GraphView>& oldGraph, const
     commonGraphViews.erase(oldGraph);
     commonGraphViews.erase(newGraph);
 
+    //todo this part may give a message such as "input output discrepencies between old and new graphs" before returning false
     if ((newNodes.size() > 0) && (oldOIn.size() != newOIn.size()) && (oldOOut.size() != newOOut.size())) {
         for (const auto& nodePtr : oldNodes) {
             nodePtr->removeView(oldGraph);
@@ -1143,6 +1144,7 @@ bool Aidge::GraphView::replace(const std::shared_ptr<GraphView>& oldGraph, const
                 inputParents[i].first -> addChild(newOIn[i].first, inputParents[i].second, newOIn[i].second);
             }
         }
+        //todo: i'm surprised there's no need for remove child first
         for (std::size_t o = 0; o < oldOOut.size(); ++o) {
             for (const auto& child : outputChildren[o]) {
                 newOOut[o].first -> addChild(child.first, newOOut[o].second, child.second);
@@ -1154,6 +1156,7 @@ bool Aidge::GraphView::replace(const std::shared_ptr<GraphView>& oldGraph, const
         // get the number of Children for oldg->outputNodes()
         if (newNodes.size() == 0) {
             // Case 3
+            // todo so this case is a big remove and stitch back
             if (oldOIn.size() == oldOOut.size()) {
                 // Same number of inputs and outputs: connect each input to the corresponding output
                 for (std::size_t i = 0; i < oldOIn.size(); ++i) {
@@ -1182,6 +1185,8 @@ bool Aidge::GraphView::replace(const std::shared_ptr<GraphView>& oldGraph, const
             ((oldOOut.size() == newOOut.size()))
         ) {
             // Case 2
+            // todo what the heck is this condition? what is that case?
+            // todo how are you supposed to connect all to the same child?
             if ((oldOIn.size() == 1) && (inputParents[0].first)) {
                 for (std::size_t i = 0; i < newOIn.size(); ++i) {
                     // Only re-connect the same input category
@@ -1202,7 +1207,7 @@ bool Aidge::GraphView::replace(const std::shared_ptr<GraphView>& oldGraph, const
                 }
             }
         }
-        else {
+        else {// todo add message as to why it's failing
             for (const auto& nodePtr : oldNodes) {
                 nodePtr->removeView(oldGraph);
             }
@@ -1216,6 +1221,7 @@ bool Aidge::GraphView::replace(const std::shared_ptr<GraphView>& oldGraph, const
     auto oldGOutputs = oldGraph->outputNodes();
     for (const auto& nodePtr : oldNodes) {
         bool removeFromGraphs = true;
+        // toddo it seems to check oldGoutput's relevance
         if (std::find(oldGOutputs.cbegin(), oldGOutputs.cend(), nodePtr) == oldGOutputs.cend()) {
             for (const auto& chPtr : nodePtr->getChildren()) {
                 if (oldNodes.find(chPtr) == oldNodes.cend()) {