update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / boost / libs / graph / example / default-constructor.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 <fstream>
#include <boost/graph/adjacency_list.hpp>

using namespace boost;

template < typename Graph > void read_graph_file(std::istream& in, Graph& g)
{
    typedef typename graph_traits< Graph >::vertices_size_type size_type;
    size_type n_vertices;
    in >> n_vertices; // read in number of vertices
    for (size_type i = 0; i < n_vertices; ++i) // Add n vertices to the graph
        add_vertex(g);
    size_type u, v;
    while (in >> u) // Read in pairs of integers as edges
        if (in >> v)
            add_edge(u, v, g);
        else
            break;
}

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
        directedS // The graph is directed
        >
        graph_type;

    graph_type g; // use default constructor to create empty graph
    std::ifstream file_in(argc >= 2 ? argv[1] : "makefile-dependencies.dat");
    read_graph_file(file_in, g);

    assert(num_vertices(g) == 15);
    assert(num_edges(g) == 19);
    return 0;
}