I've attached an example of using breadth_first_search with an
adjacency_list where VertexList=listS.
Cheers,
Jeremy
On Tue, 20 Nov 2001, Jeremy Siek wrote:
jsiek> cristi> To implement requirement 1 my adjacency_list should have its
jsiek> cristi> VertexList of type vecS.
jsiek>
jsiek> This is not required. The VertexList can be listS. However, you do need
jsiek> to provide your own color map parameter if you use listS.
----------------------------------------------------------------------
Jeremy Siek http://php.indiana.edu/~jsiek/
Ph.D. Student, Indiana Univ. B'ton email: jsiek@osl.iu.edu
C++ Booster (http://www.boost.org) office phone: (812) 855-3608
----------------------------------------------------------------------
----------
//=======================================================================
// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
//
// This file is part of the Boost Graph Library
//
// You should have received a copy of the License Agreement for the
// Boost Graph Library along with the software; see the file LICENSE.
// If not, contact Office of Research, Indiana University,
// Bloomington, IN 47405.
//
// Permission to modify the code and to distribute the code is
// granted, provided the text of this NOTICE is retained, a notice if
// the code was modified is included with the above COPYRIGHT NOTICE
// and with the COPYRIGHT NOTICE in the LICENSE file, and that the
// LICENSE file is distributed with the modified code.
//
// LICENSOR MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED.
// By way of example, but not limitation, Licensor MAKES NO
// REPRESENTATIONS OR WARRANTIES OF MERCHANTABILITY OR FITNESS FOR ANY
// PARTICULAR PURPOSE OR THAT THE USE OF THE LICENSED SOFTWARE COMPONENTS
// OR DOCUMENTATION WILL NOT INFRINGE ANY PATENTS, COPYRIGHTS, TRADEMARKS
// OR OTHER RIGHTS.
//=======================================================================
#include
#include
#include
#include
using namespace boost;
template < typename TimeMap > class bfs_time_visitor:public default_bfs_visitor {
typedef typename property_traits < TimeMap >::value_type T;
public:
bfs_time_visitor(TimeMap tmap, T & t):m_timemap(tmap), m_time(t) { }
template < typename Vertex, typename Graph >
void discover_vertex(Vertex u, const Graph & g) const
{
put(m_timemap, u, m_time++);
}
TimeMap m_timemap;
T & m_time;
};
int
main()
{
using namespace boost;
// Select the graph type we wish to use
typedef adjacency_list < listS, listS, undirectedS,
property > > graph_t;
// Set up the vertex IDs and names
enum { r, s, t, u, v, w, x, y, N };
const char *name = "rstuvwxy";
// Specify the edges in the graph
typedef std::pair < int, int >E;
E edge_array[] = { E(r, s), E(r, v), E(s, w), E(w, r), E(w, t),
E(w, x), E(x, t), E(t, u), E(x, y), E(u, y)
};
// Create the graph object
const int n_edges = sizeof(edge_array) / sizeof(E);
#ifdef BOOST_MSVC
// VC++ has trouble with the edge iterator constructor
graph_t g;
std::vector::vertex_descriptor> verts;
for (std::size_t i = 0; i < N; ++i)
verts.push_back(add_vertex(g));
for (std::size_t j = 0; j < n_edges; ++j)
add_edge(verts[edge_array[j].first], verts[edge_array[j].second], g);
#else
typedef graph_traits::vertices_size_type v_size_t;
graph_t g(edge_array, edge_array + n_edges, v_size_t(N));
#endif
// Typedefs
typedef graph_traits::vertex_descriptor Vertex;
typedef graph_traits::vertices_size_type Size;
typedef Size* Iiter;
Size time = 0;
typedef property_map::type dtime_map_t;
dtime_map_t dtime_map = get(vertex_discover_time, g);
bfs_time_visitor < dtime_map_t > vis(dtime_map, time);
breadth_first_search(g, vertex(s, g), color_map(get(vertex_color, g)).
visitor(vis));
// a vector to hold the discover time property for each vertex
std::vector < Size > dtime(num_vertices(g));
graph_traits::vertex_iterator vi, vi_end;
std::size_t c = 0;
for (tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi, ++c)
dtime[c] = dtime_map[*vi];
// Use std::sort to order the vertices by their discover time
std::vector::vertices_size_type > discover_order(N);
integer_range < int >range(0, N);
std::copy(range.begin(), range.end(), discover_order.begin());
std::sort(discover_order.begin(), discover_order.end(),
indirect_cmp < Iiter, std::less < Size > >(&dtime[0]));
std::cout << "order of discovery: ";
for (int i = 0; i < N; ++i)
std::cout << name[discover_order[i]] << " ";
std::cout << std::endl;
return EXIT_SUCCESS;
}
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