--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ossrv_pub/boost_apis/boost/graph/random.hpp Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,205 @@
+//=======================================================================
+// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
+// Copyright (C) Vladimir Prus 2003
+// 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)
+//=======================================================================
+#ifndef BOOST_GRAPH_RANDOM_HPP
+#define BOOST_GRAPH_RANDOM_HPP
+
+#include <boost/graph/graph_traits.hpp>
+#include <boost/random/uniform_int.hpp>
+#include <boost/random/variate_generator.hpp>
+
+#include <boost/pending/property.hpp>
+#include <boost/graph/properties.hpp>
+
+#include <boost/graph/adjacency_list.hpp>
+#include <boost/graph/copy.hpp>
+#include <boost/mpl/if.hpp>
+#include <boost/type_traits/is_convertible.hpp>
+
+#include <iostream>
+
+namespace boost {
+
+ // grab a random vertex from the graph's vertex set
+ template <class Graph, class RandomNumGen>
+ typename graph_traits<Graph>::vertex_descriptor
+ random_vertex(Graph& g, RandomNumGen& gen)
+ {
+ if (num_vertices(g) > 1) {
+ #if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x581))
+ std::size_t n = std::random( num_vertices(g) );
+ #else
+ uniform_int<> distrib(0, num_vertices(g)-1);
+ variate_generator<RandomNumGen&, uniform_int<> > rand_gen(gen, distrib);
+ std::size_t n = rand_gen();
+ #endif
+ typename graph_traits<Graph>::vertex_iterator
+ i = vertices(g).first;
+ while (n-- > 0) ++i; // std::advance not VC++ portable
+ return *i;
+ } else
+ return *vertices(g).first;
+ }
+
+ template <class Graph, class RandomNumGen>
+ typename graph_traits<Graph>::edge_descriptor
+ random_edge(Graph& g, RandomNumGen& gen) {
+ if (num_edges(g) > 1) {
+ #if BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x581))
+ typename graph_traits<Graph>::edges_size_type
+ n = std::random( num_edges(g) );
+ #else
+ uniform_int<> distrib(0, num_edges(g)-1);
+ variate_generator<RandomNumGen&, uniform_int<> > rand_gen(gen, distrib);
+ typename graph_traits<Graph>::edges_size_type
+ n = rand_gen();
+ #endif
+ typename graph_traits<Graph>::edge_iterator
+ i = edges(g).first;
+ while (n-- > 0) ++i; // std::advance not VC++ portable
+ return *i;
+ } else
+ return *edges(g).first;
+ }
+
+ namespace detail {
+ class dummy_property_copier {
+ public:
+ template<class V1, class V2>
+ void operator()(const V1&, const V2&) const {}
+ };
+ }
+
+ template <typename MutableGraph, class RandNumGen>
+ void generate_random_graph1
+ (MutableGraph& g,
+ typename graph_traits<MutableGraph>::vertices_size_type V,
+ typename graph_traits<MutableGraph>::vertices_size_type E,
+ RandNumGen& gen,
+ bool allow_parallel = true,
+ bool self_edges = false)
+ {
+ typedef graph_traits<MutableGraph> Traits;
+ typedef typename Traits::vertices_size_type v_size_t;
+ typedef typename Traits::edges_size_type e_size_t;
+ typedef typename Traits::vertex_descriptor vertex_descriptor;
+
+ // When parallel edges are not allowed, we create a new graph which
+ // does not allow parallel edges, construct it and copy back.
+ // This is not efficient if 'g' already disallow parallel edges,
+ // but that's task for later.
+ if (!allow_parallel) {
+
+ typedef typename boost::graph_traits<MutableGraph>::directed_category dir;
+ typedef typename mpl::if_<is_convertible<dir, directed_tag>,
+ directedS, undirectedS>::type select;
+ adjacency_list<setS, vecS, select> g2;
+ generate_random_graph1(g2, V, E, gen, true, self_edges);
+
+ copy_graph(g2, g, vertex_copy(detail::dummy_property_copier()).
+ edge_copy(detail::dummy_property_copier()));
+
+ } else {
+
+ for (v_size_t i = 0; i < V; ++i)
+ add_vertex(g);
+
+ for (e_size_t j = 0; j < E; ++j) {
+ vertex_descriptor a = random_vertex(g, gen), b;
+ do {
+ b = random_vertex(g, gen);
+ } while (self_edges == false && a == b);
+ add_edge(a, b, g);
+ }
+ }
+ }
+
+ template <typename MutableGraph, class RandNumGen>
+ void generate_random_graph
+ (MutableGraph& g,
+ typename graph_traits<MutableGraph>::vertices_size_type V,
+ typename graph_traits<MutableGraph>::vertices_size_type E,
+ RandNumGen& gen,
+ bool allow_parallel = true,
+ bool self_edges = false)
+ {
+ generate_random_graph1(g, V, E, gen, allow_parallel, self_edges);
+ }
+
+ template <typename MutableGraph, typename RandNumGen,
+ typename VertexOutputIterator, typename EdgeOutputIterator>
+ void generate_random_graph
+ (MutableGraph& g,
+ typename graph_traits<MutableGraph>::vertices_size_type V,
+ typename graph_traits<MutableGraph>::vertices_size_type E,
+ RandNumGen& gen,
+ VertexOutputIterator vertex_out,
+ EdgeOutputIterator edge_out,
+ bool self_edges = false)
+ {
+ typedef graph_traits<MutableGraph> Traits;
+ typedef typename Traits::vertices_size_type v_size_t;
+ typedef typename Traits::edges_size_type e_size_t;
+ typedef typename Traits::vertex_descriptor vertex_t;
+ typedef typename Traits::edge_descriptor edge_t;
+
+ for (v_size_t i = 0; i < V; ++i)
+ *vertex_out++ = add_vertex(g);
+
+ for (e_size_t j = 0; j < E; ++j) {
+ vertex_t a = random_vertex(g, gen), b;
+ do {
+ b = random_vertex(g, gen);
+ } while (self_edges == false && a == b);
+ edge_t e; bool inserted;
+ tie(e, inserted) = add_edge(a, b, g);
+ if (inserted)
+ *edge_out++ = std::make_pair(source(e, g), target(e, g));
+ }
+ }
+
+ namespace detail {
+
+ template<class Property, class G, class RandomGenerator>
+ void randomize_property(G& g, RandomGenerator& rg,
+ Property, vertex_property_tag)
+ {
+ typename property_map<G, Property>::type pm = get(Property(), g);
+ typename graph_traits<G>::vertex_iterator vi, ve;
+ for (tie(vi, ve) = vertices(g); vi != ve; ++vi) {
+ pm[*vi] = rg();
+ }
+ }
+
+ template<class Property, class G, class RandomGenerator>
+ void randomize_property(G& g, RandomGenerator& rg,
+ Property, edge_property_tag)
+ {
+ typename property_map<G, Property>::type pm = get(Property(), g);
+ typename graph_traits<G>::edge_iterator ei, ee;
+ for (tie(ei, ee) = edges(g); ei != ee; ++ei) {
+ pm[*ei] = rg();
+ }
+ }
+ }
+
+ template<class Property, class G, class RandomGenerator>
+ void randomize_property(G& g, RandomGenerator& rg)
+ {
+ detail::randomize_property
+ (g, rg, Property(), typename property_kind<Property>::type());
+ }
+
+
+
+
+}
+
+
+#endif