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