Oh my god, it&#39;s not implemented, right?<div><br></div><div><div>boost::mpi::group(const MPI_Group&amp; in_group, bool adopt);</div><div><br></div><div>I will have to use OpenMPI C++ terrible bindings. :-(</div><div><br>
</div><div>Júlio.</div><br><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Júlio Hoffimann</b> <span dir="ltr">&lt;<a href="mailto:julio.hoffimann@gmail.com">julio.hoffimann@gmail.com</a>&gt;</span><br>
Date: 2011/2/7<br>Subject: Boost.MPI --- boost::mpi::group class<br>To: <a href="mailto:boost-users@lists.boost.org">boost-users@lists.boost.org</a><br><br><br>Hi,<div><br></div><div>It&#39;s my first time using Boost and is amazing. I&#39;m trying to understand why this simple example bellow don&#39;t works as expected:<div>
<br></div><div><br></div><div><div>#include<span style="white-space:pre-wrap">	</span>&lt;iostream&gt;</div>
<div>#include<span style="white-space:pre-wrap">	</span>&lt;boost/mpi.hpp&gt;</div><div><br></div><div>using namespace std;</div><div>namespace mpi = boost::mpi;</div><div><br></div><div>int main ( int argc, char *argv[] )</div>

<div>{</div><div><span style="white-space:pre-wrap">	</span>mpi::environment env( argc, argv );</div><div><span style="white-space:pre-wrap">	</span>mpi::communicator world;</div><div><span style="white-space:pre-wrap">	</span>mpi::group subgroup( MPI_Group( world.group() ), true );</div>

<div><br></div><div><span style="white-space:pre-wrap">	</span>cout  &lt;&lt; &quot;I&#39;m process &quot;                          &lt;&lt;   world.rank()       &lt;&lt; endl;</div><div><span style="white-space:pre-wrap">	</span>cout  &lt;&lt; &quot;But in subgroup i&#39;m process &quot;  &lt;&lt;   subgroup.rank()  &lt;&lt; endl;</div>

<div><span style="white-space:pre-wrap">	</span>cout  &lt;&lt; &quot;And the subgroup size is... &quot;   &lt;&lt;   subgroup.size()   &lt;&lt; endl;</div><div><br></div><div><span style="white-space:pre-wrap">	</span>return 0;</div>

<div>}  // ----------  end of function main  ----------</div></div></div><div><br></div><div><br></div><div><b>1. Why every process has rank 1 in subgroup? I trying to figure out what happens, but without success.</b></div>

<div><br></div><div>The mpi::boost::group class has no copy constructor explicitly defined. That is true for many other classes in Boost.MPI...</div><div><br></div><div><b>2. It&#39;s safe to use the copy constructor generated by the compiler as follows?</b></div>

<div><b><br></b></div><div>mpi::group subgroup = world.group().exclude( discardedRanks.begin(), discardedRanks.end() );</div><div><br></div><div>Thanks in advance for any help.</div><div><br></div><div>Regards,</div><div>

Júlio.</div>
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