helper.hpp
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// (C) Copyright Andrew Sutton 2007
//
// Use, modification and distribution are subject to the
// Boost Software License, Version 1.0 (See accompanying file
// LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_GRAPH_EXAMPLE_HELPER_HPP
#define BOOST_GRAPH_EXAMPLE_HELPER_HPP
#include <string>
#include <sstream>
#include <map>
#include <algorithm>
#include <boost/graph/properties.hpp>
template < typename Graph, typename NameMap, typename VertexMap >
typename boost::graph_traits< Graph >::vertex_descriptor add_named_vertex(
Graph& g, NameMap nm, const std::string& name, VertexMap& vm)
{
typedef typename boost::graph_traits< Graph >::vertex_descriptor Vertex;
typedef typename VertexMap::iterator Iterator;
Vertex v;
Iterator iter;
bool inserted;
boost::tie(iter, inserted) = vm.insert(make_pair(name, Vertex()));
if (inserted)
{
// The name was unique so we need to add a vertex to the graph
v = add_vertex(g);
iter->second = v;
put(nm, v, name); // store the name in the name map
}
else
{
// We had alread inserted this name so we can return the
// associated vertex.
v = iter->second;
}
return v;
}
template < typename Graph, typename NameMap, typename InputStream >
inline std::map< std::string,
typename boost::graph_traits< Graph >::vertex_descriptor >
read_graph(Graph& g, NameMap nm, InputStream& is)
{
typedef typename boost::graph_traits< Graph >::vertex_descriptor Vertex;
std::map< std::string, Vertex > verts;
for (std::string line; std::getline(is, line);)
{
if (line.empty())
continue;
std::size_t index = line.find_first_of(',');
std::string first(line, 0, index);
std::string second(line, index + 1);
Vertex u = add_named_vertex(g, nm, first, verts);
Vertex v = add_named_vertex(g, nm, second, verts);
add_edge(u, v, g);
}
return verts;
}
template < typename Graph, typename InputStream >
inline std::map< std::string,
typename boost::graph_traits< Graph >::vertex_descriptor >
read_graph(Graph& g, InputStream& is)
{
typedef typename boost::graph_traits< Graph >::vertex_descriptor Vertex;
typedef boost::null_property_map< Vertex, std::string > NameMap;
return read_graph(g, NameMap(), is);
}
template < typename Graph, typename NameMap, typename WeightMap,
typename InputStream >
inline std::map< std::string,
typename boost::graph_traits< Graph >::vertex_descriptor >
read_weighted_graph(Graph& g, NameMap nm, WeightMap wm, InputStream& is)
{
typedef typename boost::graph_traits< Graph >::vertex_descriptor Vertex;
typedef typename boost::graph_traits< Graph >::edge_descriptor Edge;
std::map< std::string, Vertex > verts;
for (std::string line; std::getline(is, line);)
{
if (line.empty())
continue;
std::size_t i = line.find_first_of(',');
std::size_t j = line.find_first_of(',', i + 1);
std::string first(line, 0, i);
std::string second(line, i + 1, j - i - 1);
std::string prob(line, j + 1);
// convert the probability to a float
std::stringstream ss(prob);
float p;
ss >> p;
// add the vertices to the graph
Vertex u = add_named_vertex(g, nm, first, verts);
Vertex v = add_named_vertex(g, nm, second, verts);
// add the edge and set the weight
Edge e = add_edge(u, v, g).first;
put(wm, e, p);
}
return verts;
}
template < typename Graph, typename WeightMap, typename InputStream >
inline std::map< std::string,
typename boost::graph_traits< Graph >::vertex_descriptor >
read_weighted_graph(Graph& g, WeightMap wm, InputStream& is)
{
typedef typename boost::graph_traits< Graph >::vertex_descriptor Vertex;
typedef boost::null_property_map< Vertex, std::string > NameMap;
return read_weighted_graph(g, NameMap(), wm, is);
}
#endif