diff --git a/DataTypes.h b/DataTypes.h
index 0fd15a83aa8b0ce7f10f6c0ebe764cadd1a6f540..2ea1e9f512884d16f15164cc3da2f595bf9e3631 100644
--- a/DataTypes.h
+++ b/DataTypes.h
@@ -28,15 +28,16 @@ struct FiniteElement {
     FiniteElement() = default;
 
     FiniteElement(unsigned int p_ID, unsigned int p_areaID,
-                  std::vector<unsigned int> p_nodesID) : ID(p_ID),
-                                                         areaID(p_areaID), nodesID(std::move(p_nodesID)) {}
+                  std::vector<unsigned int> &p_nodesID) : ID(p_ID),
+                                                         areaID(p_areaID), nodesID(p_nodesID) {}
 
     friend std::ostream &operator<<(std::ostream &ost, const FiniteElement &element) {
         ost << "ID: " << element.ID << ", area ID: " << element.areaID << ", nodes ID: {";
         for (unsigned int nodeID: element.nodesID) {
             ost << nodeID << " ";
         }
-        ost << "}";
+        ost << "\b" << "}";
+        return ost;
     }
 };
 
@@ -50,4 +51,13 @@ struct BoundaryElement {
     BoundaryElement(unsigned int p_ID, unsigned int p_boundaryID,
                     std::vector<unsigned int> p_nodesID) : ID(p_ID), boundaryID(p_boundaryID),
                                                            nodesID(std::move(p_nodesID)) {}
+
+    friend std::ostream &operator<<(std::ostream &ost, const BoundaryElement &element) {
+        ost << "ID: " << element.ID << ", boundary ID: " << element.boundaryID << ", nodes ID: {";
+        for (unsigned int nodeID: element.nodesID) {
+            ost << nodeID << " ";
+        }
+        ost << "\b" << "}";
+        return ost;
+    }
 };
\ No newline at end of file