subgraph.cpp
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// (C) Copyright Jeremy Siek 2004
// 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 <set>
#include <boost/core/lightweight_test.hpp>
#include <boost/graph/subgraph.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/random.hpp>
#include "graph_test.hpp"
#include <boost/graph/iteration_macros.hpp>
#include <boost/random/mersenne_twister.hpp>
#include "test_graph.hpp"
// UNDER CONSTRUCTION
// This is a helper function to recusively compare two subgraphs,
// including the index for every local edges and their children.
template < typename subgraph_t >
void sub_cmp(subgraph_t const& g1, subgraph_t const& g2)
{
BOOST_TEST(g1.is_root() == g2.is_root());
BOOST_TEST(num_vertices(g1) == num_vertices(g2));
BOOST_TEST(num_edges(g1) == num_edges(g2));
typename subgraph_t::edge_iterator e1_i, e1_i_end, e2_i, e2_i_end;
boost::tie(e1_i, e1_i_end) = edges(g1);
boost::tie(e2_i, e2_i_end) = edges(g2);
for (; e1_i != e1_i_end; ++e1_i, ++e2_i)
{
BOOST_TEST(get(boost::edge_index, g1, *e1_i)
== get(boost::edge_index, g2, *e2_i));
}
typename subgraph_t::const_children_iterator g1_i, g1_i_end, g2_i, g2_i_end;
boost::tie(g1_i, g1_i_end) = g1.children();
boost::tie(g2_i, g2_i_end) = g2.children();
for (; g1_i != g1_i_end && g2_i != g2_i_end; ++g1_i, ++g2_i)
{
sub_cmp(*g1_i, *g2_i);
}
BOOST_TEST(g1_i == g1_i_end && g2_i == g2_i_end);
}
int main(int, char*[])
{
using namespace boost;
typedef adjacency_list< vecS, vecS, bidirectionalS,
property< vertex_color_t, int >,
property< edge_index_t, std::size_t, property< edge_weight_t, int > > >
graph_t;
typedef subgraph< graph_t > subgraph_t;
typedef graph_traits< subgraph_t >::vertex_descriptor vertex_t;
mt19937 gen;
for (int t = 0; t < 100; t += 5)
{
subgraph_t g;
int N = t + 2;
std::vector< vertex_t > vertex_set;
std::vector< std::pair< vertex_t, vertex_t > > edge_set;
generate_random_graph(g, N, N * 2, gen, std::back_inserter(vertex_set),
std::back_inserter(edge_set));
graph_test< subgraph_t > gt;
gt.test_incidence_graph(vertex_set, edge_set, g);
gt.test_bidirectional_graph(vertex_set, edge_set, g);
gt.test_adjacency_graph(vertex_set, edge_set, g);
gt.test_vertex_list_graph(vertex_set, g);
gt.test_edge_list_graph(vertex_set, edge_set, g);
gt.test_adjacency_matrix(vertex_set, edge_set, g);
std::vector< vertex_t > sub_vertex_set;
std::vector< vertex_t > sub_global_map;
std::vector< vertex_t > global_sub_map(num_vertices(g));
std::vector< std::pair< vertex_t, vertex_t > > sub_edge_set;
subgraph_t& g_s = g.create_subgraph();
const std::set< vertex_t >::size_type Nsub = N / 2;
// Collect a set of random vertices to put in the subgraph
std::set< vertex_t > verts;
while (verts.size() < Nsub)
verts.insert(random_vertex(g, gen));
for (std::set< vertex_t >::iterator it = verts.begin();
it != verts.end(); ++it)
{
vertex_t v_global = *it;
vertex_t v = add_vertex(v_global, g_s);
sub_vertex_set.push_back(v);
sub_global_map.push_back(v_global);
global_sub_map[v_global] = v;
}
// compute induced edges
BGL_FORALL_EDGES(e, g, subgraph_t)
if (container_contains(sub_global_map, source(e, g))
&& container_contains(sub_global_map, target(e, g)))
sub_edge_set.push_back(std::make_pair(
global_sub_map[source(e, g)], global_sub_map[target(e, g)]));
gt.test_incidence_graph(sub_vertex_set, sub_edge_set, g_s);
gt.test_bidirectional_graph(sub_vertex_set, sub_edge_set, g_s);
gt.test_adjacency_graph(sub_vertex_set, sub_edge_set, g_s);
gt.test_vertex_list_graph(sub_vertex_set, g_s);
gt.test_edge_list_graph(sub_vertex_set, sub_edge_set, g_s);
gt.test_adjacency_matrix(sub_vertex_set, sub_edge_set, g_s);
if (num_vertices(g_s) == 0)
return 0;
std::vector< int > weights;
for (unsigned i = 0; i < num_vertices(g_s); ++i)
weights.push_back(i * 2);
gt.test_vertex_property_graph(weights, vertex_color_t(), g_s);
// A regression test: the copy constructor of subgraph did not
// copy one of the members, so local_edge->global_edge mapping
// was broken.
{
subgraph_t g;
graph_t::vertex_descriptor v1, v2;
v1 = add_vertex(g);
v2 = add_vertex(g);
add_edge(v1, v2, g);
subgraph_t sub
= g.create_subgraph(vertices(g).first, vertices(g).second);
graph_t::edge_iterator ei, ee;
for (boost::tie(ei, ee) = edges(sub); ei != ee; ++ei)
{
// This used to segfault.
get(edge_weight, sub, *ei);
}
}
// This block generates a complete graph with 8 vertices,
// and puts the first and last four of the vertices into two children.
// Do these again to the children, so there are 4 grandchildren with 2
// vertices for each. Use the copy constructor to generate a copy and
// compare with the original one.
{
subgraph_t g1;
for (size_t i = 0; i < 8; i++)
{
add_vertex(g1);
}
subgraph_t::vertex_iterator vi_start, vi, vi_end, vj_start, vj,
vj_end;
for (tie(vi, vi_end) = vertices(g1); vi != vi_end; ++vi)
{
for (tie(vj, vj_end) = vertices(g1); vj != vj_end; ++vj)
{
if (*vi != *vj)
{
add_edge(*vi, *vj, g1);
}
}
}
tie(vi_start, vi_end) = vertices(g1);
vi = vi_start;
for (size_t i = 0; i < 4; i++)
{
++vi;
}
g1.create_subgraph(vi_start, vi);
g1.create_subgraph(++vi, vi_end);
subgraph_t::children_iterator gi1, gi2;
gi2 = g1.children().first;
gi1 = gi2++;
tie(vi_start, vi_end) = vertices(*gi1);
vi = vi_start;
tie(vj_start, vj_end) = vertices(*gi2);
vj = vj_start;
for (size_t i = 0; i < 2; i++)
{
++vi;
++vj;
}
(*gi1).create_subgraph(vi_start, vi);
(*gi1).create_subgraph(++vi, vi_end);
(*gi2).create_subgraph(vj_start, vj);
(*gi2).create_subgraph(++vj, vj_end);
subgraph_t g2(g1);
sub_cmp(g1, g2);
}
// Bootstrap the test_graph framework.
// TODO: Subgraph is fundamentally broken for property types.
// TODO: Under construction.
{
using namespace boost;
typedef property< edge_index_t, size_t, EdgeBundle > EdgeProp;
typedef adjacency_list< vecS, vecS, directedS, VertexBundle,
EdgeProp >
BaseGraph;
typedef subgraph< BaseGraph > Graph;
typedef graph_traits< Graph >::vertex_descriptor Vertex;
Graph g;
Vertex v = add_vertex(g);
typedef property_map< Graph, int VertexBundle::* >::type BundleMap;
BundleMap map = get(&VertexBundle::value, g);
get(map, v);
// put(map, v, 5);
// BOOST_ASSERT(get(map, v) == 5);
// test_graph(g);
return boost::report_errors();
}
}
return boost::report_errors();
}