update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / boost / libs / graph / example / print-in-edges.cpp

//=======================================================================
// 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/config.hpp>
#include <iostream>
#include <fstream>
#include <string>
#include <boost/graph/adjacency_list.hpp>

using namespace boost;

template < typename Graph, typename VertexNamePropertyMap >
void read_graph_file(std::istream& graph_in, std::istream& name_in, Graph& g,
    VertexNamePropertyMap name_map)
{
    typedef typename graph_traits< Graph >::vertices_size_type size_type;
    size_type n_vertices;
    typename graph_traits< Graph >::vertex_descriptor u;
    typename property_traits< VertexNamePropertyMap >::value_type name;

    graph_in >> n_vertices; // read in number of vertices
    for (size_type i = 0; i < n_vertices; ++i)
    { // Add n vertices to the graph
        u = add_vertex(g);
        name_in >> name;
        put(name_map, u, name); // ** Attach name property to vertex u **
    }
    size_type src, targ;
    while (graph_in >> src) // Read in edges
        if (graph_in >> targ)
            add_edge(src, targ, g); // add an edge to the graph
        else
            break;
}

template < typename Graph, typename VertexNameMap >
void output_in_edges(std::ostream& out, const Graph& g,
    typename graph_traits< Graph >::vertex_descriptor v, VertexNameMap name_map)
{
    typename graph_traits< Graph >::in_edge_iterator ei, ei_end;
    for (boost::tie(ei, ei_end) = in_edges(v, g); ei != ei_end; ++ei)
        out << get(name_map, source(*ei, g)) << " -> "
            << get(name_map, target(*ei, g)) << std::endl;
}

template < typename NameMap > class name_equals_t
{
public:
    name_equals_t(const std::string& n, NameMap map)
    : m_name(n), m_name_map(map)
    {
    }
    template < typename Vertex > bool operator()(Vertex u) const
    {
        return get(m_name_map, u) == m_name;
    }

private:
    std::string m_name;
    NameMap m_name_map;
};

// object generator function
template < typename NameMap >
inline name_equals_t< NameMap > name_equals(
    const std::string& str, NameMap name)
{
    return name_equals_t< NameMap >(str, name);
}

int main(int argc, const char** argv)
{
    typedef adjacency_list< listS, // Store out-edges of each vertex in a
                                   // std::list
        vecS, // Store vertex set in a std::vector
        bidirectionalS, // The graph is directed, with both out-edges and
                        // in-edges
        property< vertex_name_t, std::string > // Add a vertex property
        >
        graph_type;

    graph_type g; // use default constructor to create empty graph
    const char* dep_file_name
        = argc >= 2 ? argv[1] : "makefile-dependencies.dat";
    const char* target_file_name
        = argc >= 3 ? argv[2] : "makefile-target-names.dat";
    std::ifstream file_in(dep_file_name), name_in(target_file_name);
    if (!file_in)
    {
        std::cerr << "** Error: could not open file " << dep_file_name
                  << std::endl;
        return -1;
    }
    if (!name_in)
    {
        std::cerr << "** Error: could not open file " << target_file_name
                  << std::endl;
        return -1;
    }

    // Obtain internal property map from the graph
    property_map< graph_type, vertex_name_t >::type name_map
        = get(vertex_name, g);
    read_graph_file(file_in, name_in, g, name_map);

    graph_traits< graph_type >::vertex_iterator i, end;
    boost::tie(i, end) = vertices(g);
    i = std::find_if(i, end, name_equals("libzigzag.a", get(vertex_name, g)));
    output_in_edges(std::cout, g, *i, get(vertex_name, g));
    assert(num_vertices(g) == 15);
    assert(num_edges(g) == 19);
    return 0;
}