interior_property_map.cpp

来自「Boost provides free peer-reviewed portab」· C++ 代码 · 共 109 行

//=======================================================================
// 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>
#include <algorithm>
#include <boost/graph/adjacency_list.hpp>
#include <boost/property_map.hpp>
#include <string>

using namespace std;
using namespace boost;

/*
  Interior Property Map Basics

  An interior property map is a way of associating properties
  with the vertices or edges of a graph. The "interior" part means
  that the properties are stored inside the graph object. This can be
  convenient when the need for the properties is somewhat permanent,
  and when the properties will be with a graph for the duration of its
  lifetime. A "distance from source vertex" property is often of this
  kind.

  Sample Output

  Jeremy owes Rich some money
  Jeremy owes Andrew some money
  Jeremy owes Jeff some money
  Jeremy owes Kinis some money
  Andrew owes Jeremy some money
  Andrew owes Kinis some money
  Jeff owes Jeremy some money
  Jeff owes Rich some money
  Jeff owes Kinis some money
  Kinis owes Jeremy some money
  Kinis owes Rich some money

 */

// create a tag for our new property

enum vertex_first_name_t { vertex_first_name };
namespace boost {
  BOOST_INSTALL_PROPERTY(vertex, first_name);
}

template <class EdgeIter, class Graph>
void who_owes_who(EdgeIter first, EdgeIter last, const Graph& G)
{
  // Access the propety acessor type for this graph
  typedef typename property_map<Graph, vertex_first_name_t>
    ::const_type NamePA;
  NamePA name = get(vertex_first_name, G);

  typedef typename boost::property_traits<NamePA>::value_type NameType;

  NameType src_name, targ_name;

  while (first != last) {
    src_name = boost::get(name, source(*first,G));
    targ_name = boost::get(name, target(*first,G));
    cout << src_name << " owes " 
         << targ_name << " some money" << endl;
    ++first;
  }
}

int
main()
{
  {
    // Create the graph, and specify that we will use std::string to
    // store the first name's.
    typedef adjacency_list<vecS, vecS, directedS, 
      property<vertex_first_name_t, std::string> > MyGraphType;
    
    typedef pair<int,int> Pair;
    Pair edge_array[11] = { Pair(0,1), Pair(0,2), Pair(0,3), Pair(0,4), 
                            Pair(2,0), Pair(3,0), Pair(2,4), Pair(3,1), 
                            Pair(3,4), Pair(4,0), Pair(4,1) };
    
    MyGraphType G(5);
    for (int i=0; i<11; ++i)
      add_edge(edge_array[i].first, edge_array[i].second, G);

    property_map<MyGraphType, vertex_first_name_t>::type name
      = get(vertex_first_name, G);
    
    boost::put(name, 0, "Jeremy");
    boost::put(name, 1, "Rich");
    boost::put(name, 2, "Andrew");
    boost::put(name, 3, "Jeff");
    name[4] = "Kinis"; // you can use operator[] too
    
    who_owes_who(edges(G).first, edges(G).second, G);
  }

  cout << endl;

  return 0;
}