add VectorDimensionsT metaprogram to detect vector dimensions in C++98

src/OpenMesh/Core/Geometry/VectorDimensionsT.hh

@@ -0,0 +1,80 @@
+/* ========================================================================= *
+ *                                                                           *
+ *                               OpenMesh                                    *
+ *           Copyright (c) 2001-2015, RWTH-Aachen University                 *
+ *           Department of Computer Graphics and Multimedia                  *
+ *                          All rights reserved.                             *
+ *                            www.openmesh.org                               *
+ *                                                                           *
+ *---------------------------------------------------------------------------*
+ * This file is part of OpenMesh.                                            *
+ *---------------------------------------------------------------------------*
+ *                                                                           *
+ * Redistribution and use in source and binary forms, with or without        *
+ * modification, are permitted provided that the following conditions        *
+ * are met:                                                                  *
+ *                                                                           *
+ * 1. Redistributions of source code must retain the above copyright notice, *
+ *    this list of conditions and the following disclaimer.                  *
+ *                                                                           *
+ * 2. Redistributions in binary form must reproduce the above copyright      *
+ *    notice, this list of conditions and the following disclaimer in the    *
+ *    documentation and/or other materials provided with the distribution.   *
+ *                                                                           *
+ * 3. Neither the name of the copyright holder nor the names of its          *
+ *    contributors may be used to endorse or promote products derived from   *
+ *    this software without specific prior written permission.               *
+ *                                                                           *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A           *
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
+ * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,  *
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,       *
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR        *
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    *
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      *
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
+ *                                                                           *
+ * ========================================================================= */
+
+//=============================================================================
+//
+//  CLASS VectorDimensionsT
+//
+//=============================================================================
+
+#ifndef DOXYGEN
+
+#ifndef OPENMESH_VECTOR_DIMENSIONS_HH
+#define OPENMESH_VECTOR_DIMENSIONS_HH
+
+//== INCLUDES =================================================================
+
+#include <OpenMesh/Core/System/config.h>
+#include <OpenMesh/Core/Geometry/VectorT.hh>
+
+//== NAMESPACES ===============================================================
+
+namespace OpenMesh {
+
+//== CLASS DEFINITION =========================================================
+
+template<typename Vector>
+struct VectorDimensionsT {};
+
+template<typename Scalar, int Dim>
+struct VectorDimensionsT<OpenMesh::VectorT<Scalar, Dim>> {
+  enum {
+    value = Dim
+  };
+};
+
+//=============================================================================
+} // namespace OpenMesh
+//=============================================================================
+
+#endif // OPENMESH_VECTOR_DIMENSIONS_HH defined
+//=============================================================================
+#endif // DOXYGEN

src/OpenMesh/Core/Mesh/PolyMeshT.cc

@@ -61,6 +61,7 @@
 
 #include <OpenMesh/Core/Mesh/PolyMeshT.hh>
 #include <OpenMesh/Core/Geometry/LoopSchemeMaskT.hh>
+#include <OpenMesh/Core/Geometry/VectorDimensionsT.hh>
 #include <OpenMesh/Core/Utils/GenProg.hh>
 #include <OpenMesh/Core/Utils/vector_cast.hh>
 #include <OpenMesh/Core/System/omstream.hh>
@@ -101,7 +102,7 @@ typename PolyMeshT<Kernel>::Normal
 PolyMeshT<Kernel>::calc_face_normal(FaceHandle _fh) const
 {
   return calc_face_normal_impl(_fh, typename GenProg::IF<
-    PolyMeshT<Kernel>::Point::size() == 3,
+    VectorDimensionsT<PolyMeshT<Kernel>::Point>::value == 3,
     PointIs3DTag,
     PointIsNot3DTag
   >::Result());
@@ -155,7 +156,7 @@ typename PolyMeshT<Kernel>::Normal
 PolyMeshT<Kernel>::calc_face_normal_impl(FaceHandle, PointIsNot3DTag) const
 {
   // Dummy fallback implementation
-  return Normal(0);
+  return Normal(typename Normal::value_type(0));
 }
 
 //-----------------------------------------------------------------------------
@@ -168,7 +169,7 @@ calc_face_normal(const Point& _p0,
      const Point& _p2) const
 {
   return calc_face_normal_impl(_p0, _p1, _p2, typename GenProg::IF<
-    PolyMeshT<Kernel>::Point::size() == 3,
+    VectorDimensionsT<PolyMeshT<Kernel>::Point>::value == 3,
     PointIs3DTag,
     PointIsNot3DTag
   >::Result());
@@ -209,10 +210,9 @@ calc_face_normal_impl(const Point& _p0,
 
 template <class Kernel>
 typename PolyMeshT<Kernel>::Normal
-PolyMeshT<Kernel>::
+PolyMeshT<Kernel>::calc_face_normal_impl(const Point&, const Point&, const Point&, PointIsNot3DTag) const
-calc_face_normal_impl(const Point&, const Point&, const Point&, PointIsNot3DTag) const
 {
-    return Normal(0);
+  return Normal(typename Normal::value_type(0));
 }
 
 //-----------------------------------------------------------------------------
@@ -241,7 +241,7 @@ PolyMeshT<Kernel>::
 update_normals()
 {
   // Face normals are required to compute the vertex and the halfedge normals
-  if (Kernel::has_face_normals() ) {     
+  if (Kernel::has_face_normals() ) {
     update_face_normals();
 
     if (Kernel::has_vertex_normals() ) update_vertex_normals();