From: Wolfgang Bangerth <bangerth@math.tamu.edu>
Date: Fri, 20 Nov 2015 22:38:47 +0000 (-0600)
Subject: Improve exception message.
X-Git-Tag: v8.4.0-rc2~212^2~3
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4af8407105e50c7fd1f65226a5332dc95ec7f5f2;p=dealii.git

Improve exception message.
---

diff --git a/include/deal.II/fe/fe.h b/include/deal.II/fe/fe.h
index a2ca2fc8bc..df7976616d 100644
--- a/include/deal.II/fe/fe.h
+++ b/include/deal.II/fe/fe.h
@@ -1911,7 +1911,12 @@ public:
    *
    * @ingroup Exceptions
    */
-  DeclException0 (ExcUnitShapeValuesDoNotExist);
+  DeclExceptionMsg (ExcUnitShapeValuesDoNotExist,
+                    "You are trying to access the values or derivatives of shape functions "
+                    "on the reference cell of an element that does not define its shape "
+                    "functions through mapping from the reference cell. Consequently, "
+                    "you cannot ask for shape function values or derivatives on the "
+                    "reference cell.");
 
   /**
    * Attempt to access support points of a finite element that is not