graph/test/min_degree_empty.cpp

//=======================================================================
// Copyright 2017 Felix Salfelder
//
// Distributed under 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)
//=======================================================================

#include <boost/graph/minimum_degree_ordering.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/property_map/property_map.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/typeof/typeof.hpp>
#include <vector>
#include <map>

typedef boost::adjacency_list< boost::vecS, boost::vecS, boost::directedS > G;

int main(int argc, char** argv)
{
    size_t n = 10;
    G g(n);

    std::vector< int > inverse_perm(n, 0);
    std::vector< int > supernode_sizes(n, 1);
    BOOST_AUTO(id, boost::get(boost::vertex_index, g));
    std::vector< int > degree(n, 0);
    std::map< int, int > io;
    std::map< int, int > o;

    boost::minimum_degree_ordering(g,
        boost::make_iterator_property_map(degree.begin(), id, degree[0]),
        boost::make_assoc_property_map(io), boost::make_assoc_property_map(o),
        boost::make_iterator_property_map(
            supernode_sizes.begin(), id, supernode_sizes[0]),
        0, id);

    for (size_t k = 0; k < n; ++k)
    {
        BOOST_TEST(o[io[k]] == k);
    }

    return boost::report_errors();
}