From: bangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Fri, 17 Jan 2014 20:56:08 +0000 (+0000)
Subject: Improve error message.
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2bc52ebe8e7dd2ba733ac564c9a5f31069e88337;p=dealii-svn.git

Improve error message.


git-svn-id: https://svn.dealii.org/trunk@32238 0785d39b-7218-0410-832d-ea1e28bc413d
---

diff --git a/deal.II/include/deal.II/dofs/dof_accessor.templates.h b/deal.II/include/deal.II/dofs/dof_accessor.templates.h
index 327146e3f5..2c9af2dcc0 100644
--- a/deal.II/include/deal.II/dofs/dof_accessor.templates.h
+++ b/deal.II/include/deal.II/dofs/dof_accessor.templates.h
@@ -80,7 +80,12 @@ DoFAccessor<structdim,DH,lda>::DoFAccessor (const DoFAccessor<dim2, DH2, lda2> &
   : BaseClass(other),
     dof_handler(0)
 {
-  Assert (false, ExcInvalidObject());
+  Assert (false, ExcMessage("You are trying to assign iterators that are incompatible. "
+			    "Reasons for incompatibility are that they point to different "
+			    "types of DoFHandlers (e.g., dealii::DoFHandler and "
+			    "dealii::hp::DoFHandler) or that the refer to objects of "
+			    "different dimensionality (e.g., assigning a line iterator "
+			    "to a quad iterator)."));
 }