96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
//=======================================================================
|
|
// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
|
|
//
|
|
// 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/adjacency_list.hpp>
|
|
#include <boost/graph/breadth_first_search.hpp>
|
|
#include <boost/pending/indirect_cmp.hpp>
|
|
#include <boost/range/irange.hpp>
|
|
|
|
#include <iostream>
|
|
|
|
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< vecS, vecS, undirectedS > 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);
|
|
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
|
|
// VC++ has trouble with the edge iterator constructor
|
|
graph_t g(N);
|
|
for (std::size_t j = 0; j < n_edges; ++j)
|
|
add_edge(edge_array[j].first, edge_array[j].second, g);
|
|
#else
|
|
typedef graph_traits< graph_t >::vertices_size_type v_size_t;
|
|
graph_t g(edge_array, edge_array + n_edges, v_size_t(N));
|
|
#endif
|
|
|
|
// Typedefs
|
|
typedef graph_traits< graph_t >::vertices_size_type Size;
|
|
|
|
// a vector to hold the discover time property for each vertex
|
|
std::vector< Size > dtime(num_vertices(g));
|
|
typedef iterator_property_map< std::vector< Size >::iterator,
|
|
property_map< graph_t, vertex_index_t >::const_type >
|
|
dtime_pm_type;
|
|
dtime_pm_type dtime_pm(dtime.begin(), get(vertex_index, g));
|
|
|
|
Size time = 0;
|
|
bfs_time_visitor< dtime_pm_type > vis(dtime_pm, time);
|
|
breadth_first_search(g, vertex(s, g), visitor(vis));
|
|
|
|
// Use std::sort to order the vertices by their discover time
|
|
std::vector< graph_traits< graph_t >::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< dtime_pm_type, std::less< Size > >(dtime_pm));
|
|
|
|
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;
|
|
}
|