Boost C++ Libraries

libs/graph/example/quick_tour.cpp

//=======================================================================
// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
//
// 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/config.hpp>
#include <iostream> // for std::cout
#include <utility> // for std::pair
#include <algorithm> // for std::for_each
#include <boost/utility.hpp> // for boost::tie
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/graphviz.hpp>

using namespace boost;

template < class Graph > struct exercise_vertex
{
    exercise_vertex(Graph& g_, const char name_[]) : g(g_), name(name_) {}
    typedef typename graph_traits< Graph >::vertex_descriptor Vertex;
    void operator()(const Vertex& v) const
    {
        using namespace boost;
        typename property_map< Graph, vertex_index_t >::type vertex_id
            = get(vertex_index, g);
        std::cout << "vertex: " << name[get(vertex_id, v)] << std::endl;

        // Write out the outgoing edges
        std::cout << "\tout-edges: ";
        typename graph_traits< Graph >::out_edge_iterator out_i, out_end;
        typename graph_traits< Graph >::edge_descriptor e;
        for (boost::tie(out_i, out_end) = out_edges(v, g); out_i != out_end;
             ++out_i)
        {
            e = *out_i;
            Vertex src = source(e, g), targ = target(e, g);
            std::cout << "(" << name[get(vertex_id, src)] << ","
                      << name[get(vertex_id, targ)] << ") ";
        }
        std::cout << std::endl;

        // Write out the incoming edges
        std::cout << "\tin-edges: ";
        typename graph_traits< Graph >::in_edge_iterator in_i, in_end;
        for (boost::tie(in_i, in_end) = in_edges(v, g); in_i != in_end; ++in_i)
        {
            e = *in_i;
            Vertex src = source(e, g), targ = target(e, g);
            std::cout << "(" << name[get(vertex_id, src)] << ","
                      << name[get(vertex_id, targ)] << ") ";
        }
        std::cout << std::endl;

        // Write out all adjacent vertices
        std::cout << "\tadjacent vertices: ";
        typename graph_traits< Graph >::adjacency_iterator ai, ai_end;
        for (boost::tie(ai, ai_end) = adjacent_vertices(v, g); ai != ai_end;
             ++ai)
            std::cout << name[get(vertex_id, *ai)] << " ";
        std::cout << std::endl;
    }
    Graph& g;
    const char* name;
};

int main(int, char*[])
{
    // create a typedef for the Graph type
    typedef adjacency_list< vecS, vecS, bidirectionalS, no_property,
        property< edge_weight_t, float > >
        Graph;

    // Make convenient labels for the vertices
    enum
    {
        A,
        B,
        C,
        D,
        E,
        N
    };
    const int num_vertices = N;
    const char name[] = "ABCDE";

    // writing out the edges in the graph
    typedef std::pair< int, int > Edge;
    Edge edge_array[] = {
        Edge(A, B),
        Edge(A, D),
        Edge(C, A),
        Edge(D, C),
        Edge(C, E),
        Edge(B, D),
        Edge(D, E),
    };
    const int num_edges = sizeof(edge_array) / sizeof(edge_array[0]);

    // average transmission delay (in milliseconds) for each connection
    float transmission_delay[] = { 1.2, 4.5, 2.6, 0.4, 5.2, 1.8, 3.3, 9.1 };

    // declare a graph object, adding the edges and edge properties
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
    // VC++ can't handle the iterator constructor
    Graph g(num_vertices);
    property_map< Graph, edge_weight_t >::type weightmap = get(edge_weight, g);
    for (std::size_t j = 0; j < num_edges; ++j)
    {
        graph_traits< Graph >::edge_descriptor e;
        bool inserted;
        boost::tie(e, inserted)
            = add_edge(edge_array[j].first, edge_array[j].second, g);
        weightmap[e] = transmission_delay[j];
    }
#else
    Graph g(
        edge_array, edge_array + num_edges, transmission_delay, num_vertices);
#endif

    boost::property_map< Graph, vertex_index_t >::type vertex_id
        = get(vertex_index, g);
    boost::property_map< Graph, edge_weight_t >::type trans_delay
        = get(edge_weight, g);

    std::cout << "vertices(g) = ";
    typedef graph_traits< Graph >::vertex_iterator vertex_iter;
    std::pair< vertex_iter, vertex_iter > vp;
    for (vp = vertices(g); vp.first != vp.second; ++vp.first)
        std::cout << name[get(vertex_id, *vp.first)] << " ";
    std::cout << std::endl;

    std::cout << "edges(g) = ";
    graph_traits< Graph >::edge_iterator ei, ei_end;
    for (boost::tie(ei, ei_end) = edges(g); ei != ei_end; ++ei)
        std::cout << "(" << name[get(vertex_id, source(*ei, g))] << ","
                  << name[get(vertex_id, target(*ei, g))] << ") ";
    std::cout << std::endl;

    std::for_each(vertices(g).first, vertices(g).second,
        exercise_vertex< Graph >(g, name));

    std::map< std::string, std::string > graph_attr, vertex_attr, edge_attr;
    graph_attr["size"] = "3,3";
    graph_attr["rankdir"] = "LR";
    graph_attr["ratio"] = "fill";
    vertex_attr["shape"] = "circle";

    boost::write_graphviz(std::cout, g, make_label_writer(name),
        make_label_writer(trans_delay),
        make_graph_attributes_writer(graph_attr, vertex_attr, edge_attr));

    return 0;
}