From: Wolfgang Bangerth <bangerth@colostate.edu>
Date: Wed, 13 Mar 2019 18:26:27 +0000 (-0600)
Subject: Improve the error text of an assertion.
X-Git-Tag: v9.1.0-rc1~288^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6bda43589a278cb5e2a20ce0698744341c9ab394;p=dealii.git

Improve the error text of an assertion.
---

diff --git a/include/deal.II/numerics/vector_tools.templates.h b/include/deal.II/numerics/vector_tools.templates.h
index aebdafb337..5e024874eb 100644
--- a/include/deal.II/numerics/vector_tools.templates.h
+++ b/include/deal.II/numerics/vector_tools.templates.h
@@ -2947,7 +2947,12 @@ namespace VectorTools
                             ExcMessage(
                               "This function can only deal with requested boundary "
                               "values that correspond to primitive (scalar) base "
-                              "elements"));
+                              "elements. You may want to look up in the deal.II "
+                              "glossary what the term 'primitive' means."
+                              "\n\n"
+                              "There are alternative boundary value interpolation "
+                              "functions in namespace 'VectorTools' that you can "
+                              "use for non-primitive finite elements."));
                     }
 
                   const typename DoFHandlerType<dim, spacedim>::face_iterator