From 22a164642b78ff13c38520d0b80c44ba7284a463 Mon Sep 17 00:00:00 2001
From: wolf <wolf@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Tue, 11 Jan 2000 15:26:08 +0000
Subject: [PATCH] Add exception if there are no patches.

git-svn-id: https://svn.dealii.org/trunk@2188 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/base/include/base/data_out_base.h |  4 ++++
 deal.II/base/source/data_out_base.cc      | 13 ++++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/deal.II/base/include/base/data_out_base.h b/deal.II/base/include/base/data_out_base.h
index d91f7c0470..ae78bcb3f3 100644
--- a/deal.II/base/include/base/data_out_base.h
+++ b/deal.II/base/include/base/data_out_base.h
@@ -960,6 +960,10 @@ class DataOutBase
 				     /**
 				      * Exception
 				      */
+    DeclException0 (ExcNoPatches);
+				     /**
+				      * Exception
+				      */
     DeclException0 (ExcIO);
 
   private:
diff --git a/deal.II/base/source/data_out_base.cc b/deal.II/base/source/data_out_base.cc
index f2f12611c1..e8d936b142 100644
--- a/deal.II/base/source/data_out_base.cc
+++ b/deal.II/base/source/data_out_base.cc
@@ -27,6 +27,8 @@ void DataOutBase::write_ucd (const vector<Patch<dim> > &patches,
 {
   AssertThrow (out, ExcIO());
 
+  Assert (patches.size() > 0, ExcNoPatches());
+  
   const unsigned int n_data_sets = data_names.size();
   
 				   // first count the number of cells
@@ -403,6 +405,8 @@ void DataOutBase::write_gnuplot (const vector<Patch<dim> > &patches,
 {
   AssertThrow (out, ExcIO());
   
+  Assert (patches.size() > 0, ExcNoPatches());
+
   const unsigned int n_data_sets = data_names.size();
   
   				   // write preamble
@@ -687,8 +691,9 @@ void DataOutBase::write_povray (const vector<Patch<dim> > &patches,
 				const PovrayFlags         &flags,
 				ostream                   &out) 
 {
-
   AssertThrow (out, ExcIO());
+  
+  Assert (patches.size() > 0, ExcNoPatches());
   Assert (dim==2, ExcNotImplemented());        // only for 2-D  
 
   const unsigned int n_data_sets = data_names.size();
@@ -988,6 +993,10 @@ void DataOutBase::write_eps (const vector<Patch<dim> > &patches,
 			     const EpsFlags            &flags,
 			     ostream                   &out) 
 {
+  Assert (out, ExcIO());
+  
+  Assert (patches.size() > 0, ExcNoPatches());
+  
   switch (dim) 
     {
       case 2:
@@ -1324,6 +1333,8 @@ void DataOutBase::write_gmv (const vector<Patch<dim> > &patches,
 {
   AssertThrow (out, ExcIO());
 
+  Assert (patches.size() > 0, ExcNoPatches());
+ 
   const unsigned int n_data_sets = data_names.size();
   
 				   ///////////////////////
-- 
2.39.5