add const mesh() getter for MeshObject

ObjectTypes/MeshObject/MeshObjectT.cc

@@ -343,7 +343,7 @@
   // Content
   // ===============================================================================
 
-  /** Get a pointer to the objects mesh.
+  /** Get a pointer to the object's mesh.
   * @return Pointer to the mesh
   */
   template < class MeshT  >
@@ -351,6 +351,14 @@
     return mesh_;
   }
 
+  /** Get a const pointer to the object's mesh.
+  * @return Const pointer to the mesh
+  */
+  template < class MeshT  >
+  const MeshT* MeshObject< MeshT >::mesh() const {
+    return mesh_;
+  }
+
   /** Updates the visualization of the object. Calls MeshObject::updateGeometry,
   *  MeshObject::updateTopology, MeshObject::updateSelection and
   *  MeshObject::updateModelingRegions.