Added boost header

test/external/boost/graph/named_graph.hpp

@@ -0,0 +1,539 @@
+// Copyright (C) 2007 Douglas Gregor
+
+// Use, modification and distribution is subject to 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)
+
+// Provides support for named vertices in graphs, allowing one to more
+// easily associate unique external names (URLs, city names, employee
+// ID numbers, etc.) with the vertices of a graph.
+#ifndef BOOST_GRAPH_NAMED_GRAPH_HPP
+#define BOOST_GRAPH_NAMED_GRAPH_HPP
+
+#include <boost/config.hpp>
+#include <boost/type_traits/remove_cv.hpp>
+#include <boost/type_traits/remove_reference.hpp>
+#include <boost/multi_index_container.hpp>
+#include <boost/multi_index/hashed_index.hpp>
+#include <boost/multi_index/member.hpp>
+#include <boost/optional.hpp>
+#include <boost/throw_exception.hpp>
+#include <stdexcept> // for std::runtime_error
+
+namespace boost { namespace graph {
+
+/*******************************************************************
+ * User-customized traits                                          *
+ *******************************************************************/
+
+/**
+ * @brief Trait used to extract the internal vertex name from a vertex
+ * property.
+ *
+ * To enable the use of internal vertex names in a graph type,
+ * specialize the @c internal_vertex_name trait for your graph
+ * property (e.g., @c a City class, which stores information about the
+ * vertices in a road map).
+ */
+template<typename VertexProperty>
+struct internal_vertex_name
+{
+  /**
+   *  The @c type field provides a function object that extracts a key
+   *  from the @c VertexProperty. The function object type must have a
+   *  nested @c result_type that provides the type of the key. For
+   *  more information, see the @c KeyExtractor concept in the
+   *  Boost.MultiIndex documentation: @c type must either be @c void
+   *  (if @c VertexProperty does not have an internal vertex name) or
+   *  a model of @c KeyExtractor.
+   */
+  typedef void type;
+};
+
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+/**
+ * Extract the internal vertex name from a @c property structure by
+ * looking at its base.
+ */
+template<typename Tag, typename T, typename Base>
+struct internal_vertex_name<property<Tag, T, Base> >
+  : internal_vertex_name<Base> { };
+#endif
+
+/**
+ * Construct an instance of @c VertexProperty directly from its
+ * name. This function object should be used within the @c
+ * internal_vertex_constructor trait.
+ */
+template<typename VertexProperty>
+struct vertex_from_name
+{
+private:
+  typedef typename internal_vertex_name<VertexProperty>::type extract_name_type;
+
+  typedef typename remove_cv<
+            typename remove_reference<
+              typename extract_name_type::result_type>::type>::type
+    vertex_name_type;
+
+public:
+  typedef vertex_name_type argument_type;
+  typedef VertexProperty result_type;
+
+  VertexProperty operator()(const vertex_name_type& name)
+  {
+    return VertexProperty(name);
+  }
+};
+
+/**
+ * Throw an exception whenever one tries to construct a @c
+ * VertexProperty instance from its name.
+ */
+template<typename VertexProperty>
+struct cannot_add_vertex
+{
+private:
+  typedef typename internal_vertex_name<VertexProperty>::type extract_name_type;
+
+  typedef typename remove_cv<
+            typename remove_reference<
+              typename extract_name_type::result_type>::type>::type
+    vertex_name_type;
+
+public:
+  typedef vertex_name_type argument_type;
+  typedef VertexProperty result_type;
+
+  VertexProperty operator()(const vertex_name_type& name)
+  {
+      boost::throw_exception(std::runtime_error("add_vertex: "
+                                                "unable to create a vertex from its name"));
+  }
+};
+
+/**
+ * @brief Trait used to construct an instance of a @c VertexProperty,
+ * which is a class type that stores the properties associated with a
+ * vertex in a graph, from just the name of that vertex property. This
+ * operation is used when an operation is required to map from a
+ * vertex name to a vertex descriptor (e.g., to add an edge outgoing
+ * from that vertex), but no vertex by the name exists. The function
+ * object provided by this trait will be used to add new vertices
+ * based only on their names. Since this cannot be done for arbitrary
+ * types, the default behavior is to throw an exception when this
+ * routine is called, which requires that all named vertices be added
+ * before adding any edges by name.
+ */
+template<typename VertexProperty>
+struct internal_vertex_constructor
+{
+  /**
+   * The @c type field provides a function object that constructs a
+   * new instance of @c VertexProperty from the name of the vertex (as
+   * determined by @c internal_vertex_name). The function object shall
+   * accept a vertex name and return a @c VertexProperty. Predefined
+   * options include:
+   *
+   *   @c vertex_from_name<VertexProperty>: construct an instance of
+   *   @c VertexProperty directly from the name.
+   *
+   *   @c cannot_add_vertex<VertexProperty>: the default value, which
+   *   throws an @c std::runtime_error if one attempts to add a vertex
+   *   given just the name.
+   */
+  typedef cannot_add_vertex<VertexProperty> type;
+};
+
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+/**
+ * Extract the internal vertex constructor from a @c property structure by
+ * looking at its base.
+ */
+template<typename Tag, typename T, typename Base>
+struct internal_vertex_constructor<property<Tag, T, Base> >
+  : internal_vertex_constructor<Base> { };
+#endif
+
+/*******************************************************************
+ * Named graph-specific metafunctions                              *
+ *******************************************************************/
+namespace detail {
+  /** @internal
+   * Extracts the type of a bundled vertex property from a vertex
+   * property. The primary template matches when we have hit the end
+   * of the @c property<> list.
+   */
+  template<typename VertexProperty>
+  struct extract_bundled_vertex
+  {
+    typedef VertexProperty type;
+  };
+
+  /** @internal
+   * Recursively extract the bundled vertex property from a vertex
+   * property.
+   */
+  template<typename Tag, typename T, typename Base>
+  struct extract_bundled_vertex<property<Tag, T, Base> >
+    : extract_bundled_vertex<Base>
+  { };
+
+  /**
+   * We have found the bundled vertex property type, marked with
+   * vertex_bundle_t.
+   */
+  template<typename T, typename Base>
+  struct extract_bundled_vertex<property<vertex_bundle_t, T, Base> >
+  {
+    typedef T type;
+  };
+
+  /**
+   * Translate @c no_property into @c error_property_not_found when we
+   * have failed to extract a bundled vertex property type.
+   */
+  template<>
+  struct extract_bundled_vertex<no_property>
+  {
+    typedef boost::detail::error_property_not_found type;
+  };
+}
+
+/*******************************************************************
+ * Named graph mixin                                               *
+ *******************************************************************/
+
+/**
+ * named_graph is a mixin that provides names for the vertices of a
+ * graph, including a mapping from names to vertices. Graph types that
+ * may or may not be have vertex names (depending on the properties
+ * supplied by the user) should use maybe_named_graph.
+ *
+ * Template parameters:
+ *
+ *   Graph: the graph type that derives from named_graph
+ *
+ *   Vertex: the type of a vertex descriptor in Graph. Note: we cannot
+ *   use graph_traits here, because the Graph is not yet defined.
+ *
+ *   VertexProperty: the type stored with each vertex in the Graph.
+ */
+template<typename Graph, typename Vertex, typename VertexProperty>
+class named_graph
+{
+public:
+  /// The type of the function object that extracts names from vertex
+  /// properties.
+  typedef typename internal_vertex_name<VertexProperty>::type extract_name_type;
+  /// The type of the "bundled" property, from which the name can be
+  /// extracted.
+  typedef typename detail::extract_bundled_vertex<VertexProperty>::type
+    bundled_vertex_property_type;
+
+  /// The type of the function object that generates vertex properties
+  /// from names, for the implicit addition of vertices.
+  typedef typename internal_vertex_constructor<VertexProperty>::type
+    vertex_constructor_type;
+
+  /// The type used to name vertices in the graph
+  typedef typename remove_cv<
+            typename remove_reference<
+              typename extract_name_type::result_type>::type>::type
+    vertex_name_type;
+
+  /// The type of vertex descriptors in the graph
+  typedef Vertex vertex_descriptor;
+
+private:
+  /// Key extractor for use with the multi_index_container
+  struct extract_name_from_vertex
+  {
+    typedef vertex_name_type result_type;
+
+    extract_name_from_vertex(Graph& graph, const extract_name_type& extract)
+      : graph(graph), extract(extract) { }
+
+    const result_type& operator()(Vertex vertex) const
+    {
+      return extract(graph[vertex]);
+    }
+
+    Graph& graph;
+    extract_name_type extract;
+  };
+
+public:
+  /// The type that maps names to vertices
+  typedef multi_index::multi_index_container<
+            Vertex,
+            multi_index::indexed_by<
+              multi_index::hashed_unique<multi_index::tag<vertex_name_t>,
+                                         extract_name_from_vertex> >
+          > named_vertices_type;
+
+  /// The set of vertices, indexed by name
+  typedef typename named_vertices_type::template index<vertex_name_t>::type
+    vertices_by_name_type;
+
+  /// Construct an instance of the named graph mixin, using the given
+  /// function object to extract a name from the bundled property
+  /// associated with a vertex.
+  named_graph(const extract_name_type& extract = extract_name_type(),
+              const vertex_constructor_type& vertex_constructor
+                = vertex_constructor_type());
+
+  /// Notify the named_graph that we have added the given vertex. The
+  /// name of the vertex will be added to the mapping.
+  void added_vertex(Vertex vertex);
+
+  /// Notify the named_graph that we are removing the given
+  /// vertex. The name of the vertex will be removed from the mapping.
+  void removing_vertex(Vertex vertex);
+
+  /// Notify the named_graph that we are clearing the graph.
+  /// This will clear out all of the name->vertex mappings
+  void clearing_graph();
+
+  /// Retrieve the derived instance
+  Graph&       derived()       { return static_cast<Graph&>(*this); }
+  const Graph& derived() const { return static_cast<const Graph&>(*this); }
+
+  /// Extract the name from a vertex property instance
+  typename extract_name_type::result_type
+  extract_name(const bundled_vertex_property_type& property);
+
+  /// Search for a vertex that has the given property (based on its
+  /// name)
+  optional<vertex_descriptor>
+  vertex_by_property(const bundled_vertex_property_type& property);
+
+  /// Mapping from names to vertices
+  named_vertices_type named_vertices;
+
+  /// Constructs a vertex from the name of that vertex
+  vertex_constructor_type vertex_constructor;
+};
+
+/// Helper macro containing the template parameters of named_graph
+#define BGL_NAMED_GRAPH_PARAMS \
+  typename Graph, typename Vertex, typename VertexProperty
+/// Helper macro containing the named_graph<...> instantiation
+#define BGL_NAMED_GRAPH \
+  named_graph<Graph, Vertex, VertexProperty>
+
+template<BGL_NAMED_GRAPH_PARAMS>
+BGL_NAMED_GRAPH::named_graph(const extract_name_type& extract,
+                             const vertex_constructor_type& vertex_constructor)
+  : named_vertices(
+      typename named_vertices_type::ctor_args_list(
+        boost::make_tuple(
+          boost::make_tuple(
+            0, // initial number of buckets
+            extract_name_from_vertex(derived(), extract),
+            boost::hash<vertex_name_type>(),
+            std::equal_to<vertex_name_type>())))),
+    vertex_constructor(vertex_constructor)
+{
+}
+
+template<BGL_NAMED_GRAPH_PARAMS>
+inline void BGL_NAMED_GRAPH::added_vertex(Vertex vertex)
+{
+  named_vertices.insert(vertex);
+}
+
+template<BGL_NAMED_GRAPH_PARAMS>
+inline void BGL_NAMED_GRAPH::removing_vertex(Vertex vertex)
+{
+  typedef typename BGL_NAMED_GRAPH::vertex_name_type vertex_name_type;
+  const vertex_name_type& vertex_name = extract_name(derived()[vertex]);
+  named_vertices.erase(vertex_name);
+}
+
+template<BGL_NAMED_GRAPH_PARAMS>
+inline void BGL_NAMED_GRAPH::clearing_graph()
+{
+  named_vertices.clear();
+}
+
+template<BGL_NAMED_GRAPH_PARAMS>
+typename BGL_NAMED_GRAPH::extract_name_type::result_type
+BGL_NAMED_GRAPH::extract_name(const bundled_vertex_property_type& property)
+{
+  return named_vertices.key_extractor().extract(property);
+}
+
+template<BGL_NAMED_GRAPH_PARAMS>
+optional<typename BGL_NAMED_GRAPH::vertex_descriptor>
+BGL_NAMED_GRAPH::
+vertex_by_property(const bundled_vertex_property_type& property)
+{
+  return find_vertex(extract_name(property), *this);
+}
+
+/// Retrieve the vertex associated with the given name
+template<BGL_NAMED_GRAPH_PARAMS>
+optional<Vertex>
+find_vertex(typename BGL_NAMED_GRAPH::vertex_name_type const& name,
+            const BGL_NAMED_GRAPH& g)
+{
+  typedef typename BGL_NAMED_GRAPH::vertices_by_name_type
+    vertices_by_name_type;
+
+  // Retrieve the set of vertices indexed by name
+  vertices_by_name_type const& vertices_by_name
+    = g.named_vertices.template get<vertex_name_t>();
+
+  /// Look for a vertex with the given name
+  typename vertices_by_name_type::const_iterator iter
+    = vertices_by_name.find(name);
+
+  if (iter == vertices_by_name.end())
+    return optional<Vertex>(); // vertex not found
+  else
+    return *iter;
+}
+
+/// Retrieve the vertex associated with the given name, or add a new
+/// vertex with that name if no such vertex is available.
+template<BGL_NAMED_GRAPH_PARAMS>
+Vertex
+add_vertex(typename BGL_NAMED_GRAPH::vertex_name_type const& name,
+           BGL_NAMED_GRAPH& g)
+{
+  if (optional<Vertex> vertex = find_vertex(name, g))
+    /// We found the vertex, so return it
+    return *vertex;
+  else
+    /// There is no vertex with the given name, so create one
+    return add_vertex(g.vertex_constructor(name), g.derived());
+}
+
+/// Add an edge using vertex names to refer to the vertices
+template<BGL_NAMED_GRAPH_PARAMS>
+std::pair<typename graph_traits<Graph>::edge_descriptor, bool>
+add_edge(typename BGL_NAMED_GRAPH::vertex_name_type const& u_name,
+         typename BGL_NAMED_GRAPH::vertex_name_type const& v_name,
+         BGL_NAMED_GRAPH& g)
+{
+  return add_edge(add_vertex(u_name, g.derived()),
+                  add_vertex(v_name, g.derived()),
+                  g.derived());
+}
+
+/// Add an edge using vertex descriptors or names to refer to the vertices
+template<BGL_NAMED_GRAPH_PARAMS>
+std::pair<typename graph_traits<Graph>::edge_descriptor, bool>
+add_edge(typename BGL_NAMED_GRAPH::vertex_descriptor const& u,
+         typename BGL_NAMED_GRAPH::vertex_name_type const& v_name,
+         BGL_NAMED_GRAPH& g)
+{
+  return add_edge(u,
+                  add_vertex(v_name, g.derived()),
+                  g.derived());
+}
+
+/// Add an edge using vertex descriptors or names to refer to the vertices
+template<BGL_NAMED_GRAPH_PARAMS>
+std::pair<typename graph_traits<Graph>::edge_descriptor, bool>
+add_edge(typename BGL_NAMED_GRAPH::vertex_name_type const& u_name,
+         typename BGL_NAMED_GRAPH::vertex_descriptor const& v,
+         BGL_NAMED_GRAPH& g)
+{
+  return add_edge(add_vertex(u_name, g.derived()),
+                  v,
+                  g.derived());
+}
+
+#undef BGL_NAMED_GRAPH
+#undef BGL_NAMED_GRAPH_PARAMS
+
+/*******************************************************************
+ * Maybe named graph mixin                                         *
+ *******************************************************************/
+
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+/**
+ * A graph mixin that can provide a mapping from names to vertices,
+ * and use that mapping to simplify creation and manipulation of
+ * graphs.
+ */
+template<typename Graph, typename Vertex, typename VertexProperty,
+         typename ExtractName
+           = typename internal_vertex_name<VertexProperty>::type>
+struct maybe_named_graph : public named_graph<Graph, Vertex, VertexProperty>
+{
+};
+
+/**
+ * A graph mixin that can provide a mapping from names to vertices,
+ * and use that mapping to simplify creation and manipulation of
+ * graphs. This partial specialization turns off this functionality
+ * when the @c VertexProperty does not have an internal vertex name.
+ */
+template<typename Graph, typename Vertex, typename VertexProperty>
+struct maybe_named_graph<Graph, Vertex, VertexProperty, void>
+{
+  /// The type of the "bundled" property, from which the name can be
+  /// extracted.
+  typedef typename detail::extract_bundled_vertex<VertexProperty>::type
+    bundled_vertex_property_type;
+
+  /// Notify the named_graph that we have added the given vertex. This
+  /// is a no-op.
+  void added_vertex(Vertex) { }
+
+  /// Notify the named_graph that we are removing the given
+  /// vertex. This is a no-op.
+  void removing_vertex(Vertex) { }
+
+  /// Notify the named_graph that we are clearing the graph. This is a
+  /// no-op.
+  void clearing_graph() { }
+
+  /// Search for a vertex that has the given property (based on its
+  /// name). This always returns an empty optional<>
+  optional<Vertex>
+  vertex_by_property(const bundled_vertex_property_type&)
+  {
+    return optional<Vertex>();
+  }
+};
+#else
+template<typename Graph, typename Vertex, typename VertexProperty,
+         typename ExtractName
+           = typename internal_vertex_name<VertexProperty>::type>
+struct maybe_named_graph
+{
+  /// The type of the "bundled" property, from which the name can be
+  /// extracted.
+  typedef typename detail::extract_bundled_vertex<VertexProperty>::type
+    bundled_vertex_property_type;
+
+  /// Notify the named_graph that we have added the given vertex. This
+  /// is a no-op.
+  void added_vertex(Vertex) { }
+
+  /// Notify the named_graph that we are removing the given
+  /// vertex. This is a no-op.
+  void removing_vertex(Vertex) { }
+
+  /// Notify the named_graph that we are clearing the graph. This is a
+  /// no-op.
+  void clearing_graph() { }
+
+  /// Search for a vertex that has the given property (based on its
+  /// name). This always returns an empty optional<>
+  template<typename Property>
+  optional<Vertex>
+  vertex_by_property(const bundled_vertex_property_type&)
+  {
+    return optional<Vertex>();
+  }
+};
+#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+
+} } // end namespace boost::graph
+
+#endif // BOOST_GRAPH_NAMED_GRAPH_HPP