typename property_traits<ComponentsMap>::value_type
kosaraju_strong_components(Graph& G, ComponentsMap c,
FinishTime finish_time, ColorMap color)
{
function_requires< MutableGraphConcept<Graph> >();
// ...
typedef typename graph_traits<Graph>::vertex_descriptor Vertex;
typedef typename property_traits<ColorMap>::value_type ColorValue;
typedef color_traits<ColorValue> Color;
typename property_traits<FinishTime>::value_type time = 0;
depth_first_search
(G, make_dfs_visitor(stamp_times(finish_time, time, on_finish_vertex())),
color);
Graph G_T(num_vertices(G));
transpose_graph(G, G_T);
typedef typename property_traits<ComponentsMap>::value_type count_type;
count_type c_count(0);
detail::components_recorder<ComponentsMap>
vis(c, c_count);
// initialize G_T
typename graph_traits<Graph>::vertex_iterator ui, ui_end;
for (tie(ui, ui_end) = vertices(G_T); ui != ui_end; ++ui)
put(color, *ui, Color::white());
typedef typename property_traits<FinishTime>::value_type D;
typedef indirect_cmp< FinishTime, std::less<D> > Compare;
Compare fl(finish_time);
std::priority_queue<Vertex, std::vector<Vertex>, Compare > Q(fl);
typename graph_traits<Graph>::vertex_iterator i, j, iend, jend;
tie(i, iend) = vertices(G_T);
tie(j, jend) = vertices(G);
for ( ; i != iend; ++i, ++j) {
put(finish_time, *i, get(finish_time, *j));
Q.push(*i);
}
while ( !Q.empty() ) {
Vertex u = Q.top();
Q.pop();
if (get(color, u) == Color::white()) {
depth_first_visit(G_T, u, vis, color);
++c_count;
}
}
return c_count;
}
inline typename property_traits<Components>::value_type
connected_components(Graph& G, DFSVisitor v, Components c, DiscoverTime d,
FinishTime f, Color color, directed_tag)
{
typedef typename graph_traits<Graph>::vertex_descriptor Vertex;
typename property_traits<Color>::value_type cc = get(color, Vertex());
int time = 0;
depth_first_search(G, record_times(d, f, time, v), color);
Graph G_T(num_vertices(G));
transpose_graph(G, G_T);
typedef typename property_traits<Components>::value_type count_type;
count_type c_count(0);
components_recorder<Components, dfs_visitor<> >
vis(c, c_count, dfs_visitor<>());
// initialize G_T
typename graph_traits<Graph>::vertex_iterator ui, ui_end;
for (tie(ui, ui_end) = vertices(G_T); ui != ui_end; ++ui)
put(color, *ui, white(cc));
typedef typename property_traits<FinishTime>::value_type D;
typedef indirect_cmp< FinishTime, std::less<D> > Compare;
Compare fl(f);
priority_queue<Vertex, std::vector<Vertex>, Compare > Q(fl);
typename graph_traits<Graph>::vertex_iterator i, j, iend, jend;
tie(i, iend) = vertices(G_T);
tie(j, jend) = vertices(G);
for ( ; i != iend; ++i, ++j) {
put(f, *i, get(f, *j));
Q.push(*i);
}
while ( !Q.empty() ) {
Vertex u = Q.top();
Q.pop();
if (get(color, u) == white(cc)) {
depth_first_visit(G_T, u, vis, color);
++c_count;
}
}
return c_count;
}
