From: Daniel Arndt <daniel.arndt@iwr.uni-heidelberg.de>
Date: Mon, 30 Apr 2018 16:46:43 +0000 (+0200)
Subject: Avoid accessing elements of a zero size vector in ParticleHandler
X-Git-Tag: v9.0.0-rc1~48^2~1
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e60db5c6957a9b93a5b83f3212663c451c5d06d3;p=dealii.git

Avoid accessing elements of a zero size vector in ParticleHandler
---

diff --git a/source/particles/particle_handler.cc b/source/particles/particle_handler.cc
index 50760bf848..c2a4305a94 100644
--- a/source/particles/particle_handler.cc
+++ b/source/particles/particle_handler.cc
@@ -817,9 +817,9 @@ namespace Particles
     }
 
     // Put the received particles into the domain if they are in the triangulation
-    const void *recv_data_it = static_cast<const void *> (&recv_data.front());
+    const void *recv_data_it = static_cast<const void *> (recv_data.data());
 
-    while (reinterpret_cast<std::size_t> (recv_data_it) - reinterpret_cast<std::size_t> (&recv_data.front()) < total_recv_data)
+    while (reinterpret_cast<std::size_t> (recv_data_it) - reinterpret_cast<std::size_t> (recv_data.data()) < total_recv_data)
       {
         CellId::binary_type binary_cellid;
         memcpy(&binary_cellid, recv_data_it, cellid_size);
@@ -837,7 +837,7 @@ namespace Particles
                                        recv_data_it);
       }
 
-    AssertThrow(recv_data_it == &recv_data.back()+1,
+    AssertThrow(total_recv_data == 0 || recv_data_it == &recv_data.back()+1,
                 ExcMessage("The amount of data that was read into new particles "
                            "does not match the amount of data sent around."));
   }