Update all basic viewers to have the correct behavior when CGAL_USE_BASIC_VIEWER is not defined.

Polyhedron/include/CGAL/Polyhedron_viewer_qt.h

@@ -206,6 +206,15 @@ void draw(const Polyhedron& apoly,
   app.exec();
 }
 
+template<class Polyhedron>
+void draw(const Polyhedron& apoly,
+          const char* title="Polyhedron Viewer",
+          bool nofill=false)
+{
+  return display<Polyhedron, DefaultColorFunctorPolyhedron>
+    (apoly, title, nofill);
+}
+
 } // End namespace CGAL
 
 #else // CGAL_USE_BASIC_VIEWER
@@ -223,20 +232,17 @@ void draw(const Polyhedron&,
            <<std::endl;
 }
 
+template<class Polyhedron>
+void draw(const Polyhedron&,
+          const char* ="Polyhedron Viewer",
+          bool=false)
+{
+  std::cerr<<"Impossible to draw a Polyhedron_3 because CGAL_USE_BASIC_VIEWER is not defined."
+           <<std::endl;
+}
+
 } // End namespace CGAL
 
 #endif // CGAL_USE_BASIC_VIEWER
 
-namespace CGAL 
-{
-
-template<class Polyhedron>
-void draw(const Polyhedron& apoly,
-          const char* title="Polyhedron Viewer",
-          bool nofill=false)
-{ return display<Polyhedron, DefaultColorFunctorPolyhedron>
-    (apoly, title, nofill); }
-
-} // End namespace CGAL
-
 #endif // CGAL_POLYHEDRON_VIEWER_QT_H

Surface_mesh/include/CGAL/Surface_mesh_viewer_qt.h

@@ -198,6 +198,12 @@ void draw(const SM& amesh,
   app.exec();
 }
 
+template<class SM>
+void draw(const SM& amesh,
+          const char* title="Surface Mesh Viewer",
+          bool nofill=false)
+{ return draw<SM, DefaultColorFunctorSM>(amesh, title, nofill); }
+
 } // End namespace CGAL
 
 #else // CGAL_USE_BASIC_VIEWER
@@ -215,19 +221,17 @@ void draw(const SM&,
            <<std::endl;
 }
 
+template<class SM>
+void draw(const SM&,
+          const char* ="Surface Mesh Viewer",
+          bool=false)
+{
+  std::cerr<<"Impossible to draw a Surface mesh because CGAL_USE_BASIC_VIEWER is not defined."
+           <<std::endl;
+}
+
 } // End namespace CGAL
 
 #endif // CGAL_USE_BASIC_VIEWER
 
-namespace CGAL 
-{
-
-template<class SM>
-void draw(const SM& amesh,
-          const char* title="Surface Mesh Viewer",
-          bool nofill=false)
-{ return draw<SM, DefaultColorFunctorSM>(amesh, title, nofill); }
-
-} // End namespace CGAL
-
 #endif // CGAL_SURFACE_MESH_VIEWER_QT_H

Triangulation_2/include/CGAL/Triangulation_2_viewer_qt.h

@@ -147,6 +147,12 @@ void draw(const T2& at2,
   app.exec();
 }
 
+template<class T2>
+void draw(const T2& at2,
+          const char* title="T2 Viewer",
+          bool nofill=false)
+{ return display<T2, DefaultColorFunctorT2>(at2, title, nofill); }
+
 } // End namespace CGAL
 
 #else // CGAL_USE_BASIC_VIEWER
@@ -164,19 +170,17 @@ void draw(const T2&,
            <<std::endl;
 }
 
+template<class T2>
+void draw(const T2&,
+          const char* ="T2 Viewer",
+          bool=false)
+{
+  std::cerr<<"Impossible to draw a Triangulation_2 because CGAL_USE_BASIC_VIEWER is not defined."
+           <<std::endl;
+}
+  
 } // End namespace CGAL
 
 #endif // CGAL_USE_BASIC_VIEWER
 
-namespace CGAL 
-{
-
-template<class T2>
-void draw(const T2& at2,
-          const char* title="T2 Viewer",
-          bool nofill=false)
-{ return display<T2, DefaultColorFunctorT2>(at2, title, nofill); }
-
-} // End namespace CGAL
-
 #endif // CGAL_T2_VIEWER_QT_H

Triangulation_3/include/CGAL/Triangulation_3_viewer_qt.h

@@ -151,6 +151,12 @@ void draw(const T3& at3,
   app.exec();
 }
 
+template<class T3>
+void draw(const T3& at3,
+          const char* title="t3_viewer",
+          bool nofill=false)
+{ return display<T3, DefaultColorFunctor>(at3, title, nofill); }
+
 } // End namespace CGAL
 
 #else // CGAL_USE_BASIC_VIEWER
@@ -168,19 +174,17 @@ void draw(const T3&,
            <<std::endl;
 }
   
+template<class T3>
+void draw(const T3&,
+          const char* ="t3_viewer",
+          bool=false)
+{
+  std::cerr<<"Impossible to draw a Triangulation_3 because CGAL_USE_BASIC_VIEWER is not defined."
+           <<std::endl;
+}
+  
 } // End namespace CGAL
 
 #endif // CGAL_USE_BASIC_VIEWER
 
-namespace CGAL 
-{
-
-template<class T3>
-void draw(const T3& at3,
-          const char* title="t3_viewer",
-          bool nofill=false)
-{ return display<T3, DefaultColorFunctor>(at3, title, nofill); }
-
-} // End namespace CGAL
-
 #endif // CGAL_T3_VIEWER_QT_H