From c90dd6e1b2c8678fdf5e4ff433942acb094c3c93 Mon Sep 17 00:00:00 2001
From: heister <heister@0785d39b-7218-0410-832d-ea1e28bc413d>
Date: Mon, 29 Aug 2011 22:24:30 +0000
Subject: [PATCH] fix bug in parallel::distributed::GridRefinement for a mesh
 with less cells than CPUs involved.

git-svn-id: https://svn.dealii.org/trunk@24211 0785d39b-7218-0410-832d-ea1e28bc413d
---
 deal.II/source/distributed/grid_refinement.cc | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/deal.II/source/distributed/grid_refinement.cc b/deal.II/source/distributed/grid_refinement.cc
index 5421ca8f17..1f9306cd31 100644
--- a/deal.II/source/distributed/grid_refinement.cc
+++ b/deal.II/source/distributed/grid_refinement.cc
@@ -32,6 +32,7 @@
 
 #include <numeric>
 #include <algorithm>
+#include <limits>
 
 
 DEAL_II_NAMESPACE_OPEN
@@ -44,7 +45,11 @@ namespace
   number
   max_element (const Vector<number> &criteria)
   {
-    return *std::max_element(criteria.begin(), criteria.end());
+    return (criteria.size()>0)
+	?
+	(*std::max_element(criteria.begin(), criteria.end()))
+	:
+	std::numeric_limits<number>::min();
   }
 
 
@@ -54,7 +59,11 @@ namespace
   number
   min_element (const Vector<number> &criteria)
   {
-    return *std::min_element(criteria.begin(), criteria.end());
+    return (criteria.size()>0)
+	?
+	(*std::min_element(criteria.begin(), criteria.end()))
+	:
+	std::numeric_limits<number>::max();
   }
 
 
-- 
2.39.5