remove_edge_if_dir.cpp

来自「Boost provides free peer-reviewed portab」· C++ 代码 · 共 74 行

//=======================================================================
// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
//
// 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/config.hpp>
#include <iostream>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graph_utility.hpp>

/*
  Sample output:

  original graph:
  0 --> 3 2 3 
  1 --> 3 
  2 --> 0 
  3 --> 2 

  removing edges (0,3)
  0 --> 2 
  1 --> 3 
  2 --> 0 
  3 --> 2 
  removing edge (0,2) and (3, 2)
  0 --> 
  1 --> 3 
  2 --> 0 
  3 --> 
  
 */

using namespace boost;

typedef adjacency_list<vecS, vecS, directedS> Graph;


int
main()
{
  typedef std::pair<std::size_t,std::size_t> Edge;
  Edge edges[6] = { Edge(0,3), Edge(0,2), Edge(0, 3),
                    Edge(1,3),
                    Edge(2, 0),
                    Edge(3, 2) };

#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
  // VC++ can't handle iterator constructor
  Graph g(4);
  for (std::size_t j = 0; j < 6; ++j)
    add_edge(edges[j].first, edges[j].second, g);
#else
  Graph g(edges, edges + 6, 4);
#endif

  std::cout << "original graph:" << std::endl;
  print_graph(g, get(vertex_index, g));
  std::cout << std::endl;

  std::cout << "removing edges (0,3)" << std::endl;
  remove_out_edge_if(vertex(0,g), incident_to(vertex(3,g), g), g);
  print_graph(g, get(vertex_index, g));

  std::cout << "removing edge (0,2) and (3, 2)" << std::endl;
  remove_edge_if(incident_to(vertex(2,g), g), g);
  print_graph(g, get(vertex_index, g));

  return 0;
}