Base: fixes #10462: mesh.unite() causes segementaion fault

src/Base/Builder3D.cpp

@@ -957,7 +957,8 @@ void InventorBuilder::endSeparator()
  * A more elaborate description of the constructor.
  */
 Builder3D::Builder3D()
-  : InventorBuilder(result)
+  : result{}
+  , builder{result}
 {
 }
 
@@ -1010,6 +1011,21 @@ void Builder3D::saveToFile(const char* FileName)
     file << result.str();
 }
 
+void Builder3D::addNode(const NodeItem& item)
+{
+    builder.addNode(item);
+}
+
+void Builder3D::beginSeparator()
+{
+    builder.beginSeparator();
+}
+
+void Builder3D::endSeparator()
+{
+    builder.endSeparator();
+}
+
 // -----------------------------------------------------------------------------
 
 template<typename T>

src/Base/Builder3D.h

@@ -604,7 +604,6 @@ public:
      * \brief Closes the last added separator node.
      */
     void endSeparator();
-    /** @name Appearance handling */
 
 private:
     void increaseIndent();
@@ -642,11 +641,11 @@ private:
  *  \endcode
  * \see Base::ConsoleSingleton
  */
-class BaseExport Builder3D : public InventorBuilder
+class BaseExport Builder3D
 {
 public:
     Builder3D();
-    virtual ~Builder3D();
+    ~Builder3D();
 
     /// clear the string buffer
     void clear();
@@ -659,9 +658,24 @@ public:
     void saveToFile(const char* FileName);
     //@}
 
+    /*!
+     * \brief addNode
+     * Writes the content of the added node to the output stream.
+     */
+    void addNode(const NodeItem&);
+    /*!
+     * \brief Sets a separator node.
+     */
+    void beginSeparator();
+    /*!
+     * \brief Closes the last added separator node.
+     */
+    void endSeparator();
+
 private:
     /// the result string
     std::stringstream result;
+    InventorBuilder builder;
 };
 
 /**