Improve error message.

This is in response to an email on the mailing list that showed an error message that wasn't particularly helpful.

diff --git a/include/deal.II/grid/grid_in.h b/include/deal.II/grid/grid_in.h
index 2562f2870e2c00016353b0b4345a1722b5a6f072..6798155dc5cc8ed248460abcb5a51a721f80fa95 100644 (file)
--- a/include/deal.II/grid/grid_in.h
+++ b/include/deal.II/grid/grid_in.h
@@ -510,8 +510,9 @@ public:
    */
   DeclException2 (ExcInvalidVertexIndex,
                   int, int,
-                  << "Trying to access invalid vertex index " << arg2
-                  << " while creating cell " << arg1);
+                  << "While creating cell " << arg1
+                  << ", you are referencing a vertex with index " << arg2
+                  << " but no vertex with this index has been described in the input file.");
   /**
    * Exception
    */

diff --git a/source/grid/grid_in.cc b/source/grid/grid_in.cc
index 024a708b2e0fc97cdb4012a4d4968d963f4bef43..a7b9f7fb98f8772681d1c3b4fa404b499ed596ff 100644 (file)
--- a/source/grid/grid_in.cc
+++ b/source/grid/grid_in.cc
@@ -659,9 +659,11 @@ void GridIn<dim, spacedim>::read_ucd (std::istream &in)
             else
               {
                 // no such vertex index
-                AssertThrow (false, ExcInvalidVertexIndex(cell, cells.back().vertices[i]));
+                AssertThrow (false,
+                             ExcInvalidVertexIndex(cell, cells.back().vertices[i]));
+
                 cells.back().vertices[i] = numbers::invalid_unsigned_int;
-              };
+              }
         }
       else if ((cell_type == "line") && ((dim == 2) || (dim == 3)))
         // boundary info