diff --git a/libsrc/csg/csgeom.cpp b/libsrc/csg/csgeom.cpp
index a1abe6d6..0cb2c8c2 100644
--- a/libsrc/csg/csgeom.cpp
+++ b/libsrc/csg/csgeom.cpp
@@ -648,7 +648,8 @@ namespace netgen
 
   int CSGeometry :: SetTopLevelObject (Solid * sol, Surface * surf)
   {
-    return toplevelobjects.Append (new TopLevelObject (sol, surf)) - 1;
+    toplevelobjects.Append (new TopLevelObject (sol, surf));
+    return toplevelobjects.Size()-1;
   }
 
   TopLevelObject * CSGeometry :: 
diff --git a/libsrc/csg/edgeflw.cpp b/libsrc/csg/edgeflw.cpp
index b2afbfdc..eaced993 100644
--- a/libsrc/csg/edgeflw.cpp
+++ b/libsrc/csg/edgeflw.cpp
@@ -1158,7 +1158,8 @@ namespace netgen
 			//seg.surfnr2 = s2_rep;
 			seg.surfnr1 = s1;
 			seg.surfnr2 = s2;
-			hi = refedges.Append (seg);
+                        refedges.Append (seg);
+                        hi = refedges.Size();
 			refedgesinv.Append (edgeinv);
 			edges_priority.Append((pre_ok[k-1]) ? 1 : 0);
 		      }
diff --git a/libsrc/csg/polyhedra.cpp b/libsrc/csg/polyhedra.cpp
index a09d7433..1bb1d1d2 100644
--- a/libsrc/csg/polyhedra.cpp
+++ b/libsrc/csg/polyhedra.cpp
@@ -499,7 +499,8 @@ int Polyhedra :: AddPoint (const Point<3> & p)
   else
     poly_bbox.Add(p);
 
-  return points.Append (p);
+  points.Append (p);
+  return points.Size();
 }
 
 int Polyhedra :: AddFace (int pi1, int pi2, int pi3, int inputnum)
diff --git a/libsrc/csg/specpoin.cpp b/libsrc/csg/specpoin.cpp
index 10da4bb9..15d41d39 100644
--- a/libsrc/csg/specpoin.cpp
+++ b/libsrc/csg/specpoin.cpp
@@ -2027,7 +2027,8 @@ namespace netgen
 		      
 		      if (spi == -1)
 			{
-			  spi = specpoints.Append (SpecialPoint()) - 1;
+			  specpoints.Append (SpecialPoint());
+                          spi = specpoints.Size()-1;
 			  specpoint2point.Append (i);
 			  specpoints.Last().unconditional = 0;
 			  searchtree.Insert (apoints[i], spi);
diff --git a/libsrc/csg/vscsg.cpp b/libsrc/csg/vscsg.cpp
index 1f10a003..8fab26bd 100644
--- a/libsrc/csg/vscsg.cpp
+++ b/libsrc/csg/vscsg.cpp
@@ -416,7 +416,7 @@ namespace netgen
 	    const Point3d & p = mesh->Point(i);
 	    glRasterPos3d (p.X(), p.Y(), p.Z());
 	  
-	    sprintf (buf, "%d", i);
+	    sprintf (buf, "%d", int(i));
 	    // glCallLists (GLsizei(strlen (buf)), GL_UNSIGNED_BYTE, buf);
 	    MyOpenGLText (buf);
 	  }
diff --git a/libsrc/general/array.hpp b/libsrc/general/array.hpp
index 69cf2f30..9c6bcbe5 100644
--- a/libsrc/general/array.hpp
+++ b/libsrc/general/array.hpp
@@ -293,13 +293,13 @@ namespace netgen
 
 
     /// Add element at end of array. reallocation if necessary.
-    int Append (const T & el)
+    void Append (const T & el)
     {
       if (size == allocsize) 
 	ReSize (size+1);
       data[size] = el;
       size++;
-      return size;
+      // return size;
     }
 
     template <typename T2, int B2>
diff --git a/libsrc/interface/wuchemnitz.cpp b/libsrc/interface/wuchemnitz.cpp
index 8641a8cd..46872fb0 100644
--- a/libsrc/interface/wuchemnitz.cpp
+++ b/libsrc/interface/wuchemnitz.cpp
@@ -202,7 +202,8 @@ namespace netgen
                 fa.p1 = i3.I1();
                 fa.p2 = i3.I2();
                 fa.p3 = i3.I3();
-                facei = faces.Append (fa);
+                faces.Append (fa);
+                facei = faces.Size();
                 faceindex.Set (i3, facei);
               } 
         
@@ -241,7 +242,8 @@ namespace netgen
                 EDGE ed;
                 ed.p1 = i2.I1();
                 ed.p2 = i2.I2();
-                edgei = edges.Append (ed);
+                edges.Append (ed);
+                edgei = edges.Size();
                 edgeindex.Set (i2, edgei);
               } 
         
diff --git a/libsrc/meshing/adfront2.cpp b/libsrc/meshing/adfront2.cpp
index 647de0b4..7eb426ad 100644
--- a/libsrc/meshing/adfront2.cpp
+++ b/libsrc/meshing/adfront2.cpp
@@ -88,7 +88,8 @@ namespace netgen
       }
     else
       {
-	pi = points.Append (FrontPoint2 (p, globind, mgi, pointonsurface)) - 1;
+	points.Append (FrontPoint2 (p, globind, mgi, pointonsurface));
+        pi = points.Size()-1;
       }
 
     if (mgi)
@@ -128,7 +129,8 @@ namespace netgen
       }
     else
       {
-	li = lines.Append(FrontLine (INDEX_2(pi1, pi2))) - 1;
+	lines.Append(FrontLine (INDEX_2(pi1, pi2)));
+        li = lines.Size()-1;
       }
 
   
@@ -332,7 +334,8 @@ namespace netgen
 	      {
 		pindex.Append (pi);
 		invpindex[pi] = pindex.Size();
-		loclines[i][j] = locpoints.Append (points[pi].P());
+                locpoints.Append (points[pi].P());
+		loclines[i][j] = locpoints.Size();
 	      }
 	    else
 	      loclines[i][j] = invpindex[pi];
@@ -349,7 +352,8 @@ namespace netgen
 	    // Dist2 (points.Get(i).P(), p0) <= xh2 &&
 	    invpindex[i] <= 0)
 	  {
-	    invpindex[i] = locpoints.Append (points[i].P());
+            locpoints.Append (points[i].P());
+	    invpindex[i] = locpoints.Size();
 	    pindex.Append(i);
 	  }
       }
diff --git a/libsrc/meshing/adfront3.cpp b/libsrc/meshing/adfront3.cpp
index af9ed03c..089b96ab 100644
--- a/libsrc/meshing/adfront3.cpp
+++ b/libsrc/meshing/adfront3.cpp
@@ -159,8 +159,9 @@ INDEX AdFront3 :: AddFace (const MiniElement2d & aface)
 
   for (i = 1; i <= aface.GetNP(); i++)
     points[aface.PNum(i)].DecFrontNr (minfn+1);
-
-  int nfn = faces.Append(FrontFace (aface));
+  
+  faces.Append(FrontFace (aface));
+  int nfn = faces.Size();
   faces.Elem(nfn).cluster = cluster;
 
   if (hashon && hashcreated) 
diff --git a/libsrc/meshing/meshclass.hpp b/libsrc/meshing/meshclass.hpp
index 1ac00716..9b747ac7 100644
--- a/libsrc/meshing/meshclass.hpp
+++ b/libsrc/meshing/meshclass.hpp
@@ -577,10 +577,10 @@ namespace netgen
 
     ///
     int AddFaceDescriptor(const FaceDescriptor& fd)
-    { return facedecoding.Append(fd); }
+    { facedecoding.Append(fd); return facedecoding.Size(); }
 
     int AddEdgeDescriptor(const EdgeDescriptor & fd)
-    { return edgedecoding.Append(fd) - 1; }
+    { edgedecoding.Append(fd); return edgedecoding.Size() - 1; }
 
     ///
     DLL_HEADER void SetMaterial (int domnr, const string & mat);
diff --git a/libsrc/meshing/ruler2.cpp b/libsrc/meshing/ruler2.cpp
index f1c84ee4..a6d5410f 100644
--- a/libsrc/meshing/ruler2.cpp
+++ b/libsrc/meshing/ruler2.cpp
@@ -593,8 +593,9 @@ namespace netgen
 				Point2d np = rule->GetPoint(i);
 				np.X() += newu (2 * (i-oldnp) - 2);
 				np.Y() += newu (2 * (i-oldnp) - 1);
-				
-				pmap.Elem(i) = lpoints.Append (np);
+
+                                lpoints.Append (np);
+				pmap.Elem(i) = lpoints.Size();
 			      }
 			  }
 
diff --git a/libsrc/meshing/ruler3.cpp b/libsrc/meshing/ruler3.cpp
index c43401ee..e33142bf 100644
--- a/libsrc/meshing/ruler3.cpp
+++ b/libsrc/meshing/ruler3.cpp
@@ -870,8 +870,8 @@ int Meshing3 :: ApplyRules
 			      np.X() += newu (3 * (i-oldnp) - 3);
 			      np.Y() += newu (3 * (i-oldnp) - 2);
 			      np.Z() += newu (3 * (i-oldnp) - 1);
-			      
-			      pmap.Elem(i) = lpoints.Append (np)-1+PointIndex::BASE;
+			      lpoints.Append (np);
+                              pmap.Elem(i) = lpoints.Size()-1+PointIndex::BASE;
 			    }
 			  
 			  // Set new Faces:
diff --git a/libsrc/stlgeom/stlgeom.cpp b/libsrc/stlgeom/stlgeom.cpp
index 91f3ab22..a89a1757 100644
--- a/libsrc/stlgeom/stlgeom.cpp
+++ b/libsrc/stlgeom/stlgeom.cpp
@@ -455,7 +455,8 @@ int STLGeometry :: AddEdge(int ap1, int ap2)
   STLEdge e(ap1,ap2);
   e.SetLeftTrig(GetLeftTrig(ap1,ap2));
   e.SetRightTrig(GetRightTrig(ap1,ap2));
-  return edges.Append(e);
+  edges.Append(e);
+  return edges.Size();
 }
 
 void STLGeometry :: STLDoctorConfirmEdge()
diff --git a/libsrc/stlgeom/stlgeom.hpp b/libsrc/stlgeom/stlgeom.hpp
index 59a3342e..cb51cfae 100644
--- a/libsrc/stlgeom/stlgeom.hpp
+++ b/libsrc/stlgeom/stlgeom.hpp
@@ -302,11 +302,11 @@ namespace netgen
 	DLL_HEADER int GetNodeOfSelTrig() const;
 
 
-    int AddNormal(const Vec3d& n) {return normals.Append(n);}
+    int AddNormal(const Vec3d& n) { normals.Append(n); return normals.Size(); }
     const Vec3d & GetNormal(int nr) const {return normals.Get(nr);}
     void SetNormal(int nr, const Vec3d& n) {normals.Elem(nr) = n;}
 
-    int AddEdge(const STLEdge& v) {return edges.Append(v);}
+    int AddEdge(const STLEdge& v) { edges.Append(v); return edges.Size(); }
     int AddEdge(int p1, int p2);
 
     STLEdge GetEdge(int nr) {return edges.Get(nr);}
@@ -434,7 +434,7 @@ namespace netgen
     int ProjectOnWholeSurface (Point<3> & p3d) const;
 
     int GetNLines() const {return lines.Size();}
-    int AddLine(STLLine* line) {return lines.Append(line);}
+    int AddLine(STLLine* line) { lines.Append(line); return lines.Size(); }
     STLLine* GetLine(int nr) const {return lines.Get(nr);}
     int GetLineP(int lnr, int pnr) const {return lines.Get(lnr)->PNum(pnr);}
     int GetLineNP(int nr) const {return lines.Get(nr)->NP();}
diff --git a/libsrc/stlgeom/stltool.cpp b/libsrc/stlgeom/stltool.cpp
index 855cec42..ee42da1b 100644
--- a/libsrc/stlgeom/stltool.cpp
+++ b/libsrc/stlgeom/stltool.cpp
@@ -19,7 +19,8 @@ int AddPointIfNotExists(Array<Point3d>& ap, const Point3d& p, double eps)
   for (int i = 1; i <= ap.Size(); i++)
     if (Dist2(ap.Get(i),p) <= eps2 ) 
       return i;
-  return ap.Append(p);
+  ap.Append(p);
+  return ap.Size();
 }
 
 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
diff --git a/libsrc/stlgeom/stltopology.cpp b/libsrc/stlgeom/stltopology.cpp
index f4078ead..53d3d9f0 100644
--- a/libsrc/stlgeom/stltopology.cpp
+++ b/libsrc/stlgeom/stltopology.cpp
@@ -592,7 +592,8 @@ void STLTopology :: FindNeighbourTrigs()
 	    }
 	  else
 	    {
-	      enr = topedges.Append (STLTopEdge (pi1, pi2, i, 0));
+	      topedges.Append (STLTopEdge (pi1, pi2, i, 0));
+              enr = topedges.Size();
 	      ht_topedges->Set (i2, enr);
 	      trig.EdgeNum(j) = enr;
 	    }
diff --git a/libsrc/stlgeom/stltopology.hpp b/libsrc/stlgeom/stltopology.hpp
index 37c13603..7351615d 100644
--- a/libsrc/stlgeom/stltopology.hpp
+++ b/libsrc/stlgeom/stltopology.hpp
@@ -293,7 +293,7 @@ public:
 
 
   int GetNP() const { return points.Size(); }
-  int AddPoint(const Point<3> & p) { return points.Append(p); }
+  int AddPoint(const Point<3> & p) { points.Append(p); return points.Size(); }
   const Point<3> & GetPoint(int nr) const { return points.Get(nr); }
   int GetPointNum (const Point<3> & p);
   void SetPoint(int nr, const Point<3> & p) { points.Elem(nr) = p; }
diff --git a/libsrc/visualization/vssolution.cpp b/libsrc/visualization/vssolution.cpp
index a83fd9c0..18b217a4 100644
--- a/libsrc/visualization/vssolution.cpp
+++ b/libsrc/visualization/vssolution.cpp
@@ -4216,8 +4216,8 @@ namespace netgen
                                             Point<3> p2 = locgrid[teti[pi2]];
                                             cppt.lami =  p2 + edgelam[ednr] * (p1-p2);
                                            
- 
-                                            pnr = pts.Append (cppt)-1;
+                                            pts.Append (cppt);
+                                            pnr = pts.Size()-1;
                                             edges.Set (pair, pnr);
                                           }