From: Timo Heister <timo.heister@gmail.com>
Date: Tue, 28 Jul 2015 17:28:23 +0000 (-0400)
Subject: early out compute_point_to_point_communication_pattern()
X-Git-Tag: v8.4.0-rc2~706^2~2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d46ed19e24986ccbc211656f8650afe403c9431b;p=dealii.git

early out compute_point_to_point_communication_pattern()

Fixes another stl invalid access
---

diff --git a/source/base/mpi.cc b/source/base/mpi.cc
index cd69c9c358..28a575330f 100644
--- a/source/base/mpi.cc
+++ b/source/base/mpi.cc
@@ -141,6 +141,10 @@ namespace Utilities
       const unsigned int max_n_destinations
         = Utilities::MPI::max (destinations.size(), mpi_comm);
 
+      if (max_n_destinations==0)
+        // all processes have nothing to send/receive:
+        return std::vector<unsigned int>();
+
       // now that we know the number
       // of data packets every
       // processor wants to send, set