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// Copyright (C) 2013 Andreas Hehn <hehn@phys.ethz.ch>, ETH Zurich
// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
// A test of communicators created from groups.
#include <boost/mpi/environment.hpp>
#include <boost/mpi/communicator.hpp>
#include <boost/mpi/group.hpp>
#include <vector>
#include <algorithm>
#define BOOST_TEST_MODULE mpi_group_test
#include <boost/test/included/unit_test.hpp>
namespace mpi = boost::mpi;
template <typename T>
struct iota
{
iota() : state(0){};
T operator()()
{
return state++;
}
T state;
};
void group_test(const mpi::communicator& comm)
{
std::vector<int> grp_a_ranks(comm.size() / 2);
std::generate(grp_a_ranks.begin(),grp_a_ranks.end(),iota<int>());
mpi::group grp_a = comm.group().include(grp_a_ranks.begin(),grp_a_ranks.end());
mpi::group grp_b = comm.group().exclude(grp_a_ranks.begin(),grp_a_ranks.end());
mpi::communicator part_a(comm,grp_a);
mpi::communicator part_b(comm,grp_b);
if(part_a)
{
std::cout << "comm rank: " << comm.rank() << " -> part_a rank:" << part_a.rank() << std::endl;
BOOST_CHECK(part_a.rank() == comm.rank());
}
if(part_b)
{
std::cout << "comm rank: " << comm.rank() << " -> part_b rank:" << part_b.rank() << std::endl;
BOOST_CHECK(part_b.rank() == comm.rank() - comm.size()/2);
}
}
BOOST_AUTO_TEST_CASE(group)
{
mpi::environment env;
mpi::communicator comm;
group_test(comm);
}
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