EQ2EMu/EQ2/source/depends/boost_1_72_0/libs/graph/test/strong_components_test.cpp

//=======================================================================
// Copyright 2014 Alexander Lauser.
// Authors: Alexander Lauser
//
// 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)
//=======================================================================

// This test is an adapted version of the MWE for Bug #10231 (showing
// incorrect root_map computation).

/* Output should be:
The example graph:
a --> b 
b --> a c 
c --> b 

Vertex a is in component 0 and has root 0
Vertex b is in component 0 and has root 0
Vertex c is in component 0 and has root 0
*/
#include <boost/config.hpp>
#include <iostream>
#include <vector>
#include <boost/graph/strong_components.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graph_utility.hpp>

int main(int, char*[])
{
  using namespace boost;

  adjacency_list<vecS, vecS, directedS> G;

  typedef graph_traits<adjacency_list<vecS, vecS, directedS> >::vertex_descriptor Vertex;
  Vertex a = add_vertex(G);
  Vertex b = add_vertex(G);
  Vertex c = add_vertex(G);
  
  add_edge(a, b, G);
  add_edge(b, a, G);

  add_edge(c, b, G);
  add_edge(b, c, G);

#if VERBOSE
  std::cout << "The example graph:" << std::endl;
  const char* name = "abc";
  print_graph(G, name);
  std::cout << std::endl;
#endif
  
  std::vector<int> component(num_vertices(G)), discover_time(num_vertices(G));
  std::vector<default_color_type> color(num_vertices(G));
  std::vector<Vertex> root(num_vertices(G));
  strong_components(G, make_iterator_property_map(component.begin(), get(vertex_index, G)), 
		    root_map(make_iterator_property_map(root.begin(), get(vertex_index, G))).
		    color_map(make_iterator_property_map(color.begin(), get(vertex_index, G))).
		    discover_time_map(make_iterator_property_map(discover_time.begin(), get(vertex_index, G))));
  
#if VERBOSE
  for (std::vector<int>::size_type i = 0; i != component.size(); ++i)
    std::cout << "Vertex " << name[i]
	      << " is in component " << component[i] 
	      << " and has root " << root[i] << std::endl;
#endif
  
#if VERBOSE
  bool test_failed;
#endif
  int ret = 0;
  
  //////////
#if VERBOSE
  test_failed = false;
  std::cerr << "Testing component-computation of strong_components ..." << std::endl;
#endif
  for (std::vector<int>::size_type i = 0; i != component.size(); ++i) {
    if(component[i] != 0) {
#if VERBOSE
      test_failed = true;
#endif
      ret = -1;
      break;
    }
  }
#if VERBOSE
  std::cerr << (test_failed ? "   **** Failed." :  "   Passed.") << std::endl;
#endif
  //////////
  
  //////////
#if VERBOSE
  test_failed = false;
  std::cerr << "Testing root_map-computation of strong_components ..." << std::endl;
#endif
  for (std::vector<int>::size_type i = 0; i != component.size(); ++i) {
    if(root[i] != 0) {
#if VERBOSE
      test_failed = true;
#endif
      ret = -1;
      break;
    }
  }
#if VERBOSE
  std::cerr << (test_failed ? "   **** Failed." :  "   Passed.") << std::endl;
#endif
  //////////
  
  if (ret == 0)
    std::cout << "tests passed" << std::endl;
  return ret;
}