301 lines
11 KiB
Plaintext
301 lines
11 KiB
Plaintext
|
//=======================================================================
|
||
|
|
// 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)
|
||
|
|
//=======================================================================
|
||
|
|
//
|
||
|
|
// Revision History:
|
||
|
|
// 01 April 2001: Modified to use new <boost/limits.hpp> header. (JMaddock)
|
||
|
|
//
|
||
|
|
#ifndef BOOST_GRAPH_GRAPH_SEARCH_VISITORS_HPP
|
||
|
|
#define BOOST_GRAPH_GRAPH_SEARCH_VISITORS_HPP
|
||
|
|
|
||
|
|
#include <iosfwd>
|
||
|
|
#include <boost/config.hpp>
|
||
|
|
#include <boost/type_traits/is_same.hpp>
|
||
|
|
#include <boost/mpl/bool.hpp>
|
||
|
|
#include <boost/property_map/property_map.hpp>
|
||
|
|
#include <boost/graph/graph_traits.hpp>
|
||
|
|
#include <boost/limits.hpp>
|
||
|
|
|
||
|
|
namespace boost {
|
||
|
|
|
||
|
|
// This is a bit more convenient than std::numeric_limits because
|
||
|
|
// you don't have to explicitly provide type T.
|
||
|
|
template <class T>
|
||
|
|
inline T numeric_limits_max(T) { return (std::numeric_limits<T>::max)(); }
|
||
|
|
|
||
|
|
//========================================================================
|
||
|
|
// Event Tags
|
||
|
|
|
||
|
|
namespace detail {
|
||
|
|
// For partial specialization workaround
|
||
|
|
enum event_visitor_enum
|
||
|
|
{ on_no_event_num,
|
||
|
|
on_initialize_vertex_num, on_start_vertex_num,
|
||
|
|
on_discover_vertex_num, on_finish_vertex_num, on_examine_vertex_num,
|
||
|
|
on_examine_edge_num, on_tree_edge_num, on_non_tree_edge_num,
|
||
|
|
on_gray_target_num, on_black_target_num,
|
||
|
|
on_forward_or_cross_edge_num, on_back_edge_num, on_finish_edge_num,
|
||
|
|
on_edge_relaxed_num, on_edge_not_relaxed_num,
|
||
|
|
on_edge_minimized_num, on_edge_not_minimized_num
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename Event, typename Visitor>
|
||
|
|
struct functor_to_visitor : Visitor
|
||
|
|
{
|
||
|
|
typedef Event event_filter;
|
||
|
|
functor_to_visitor(const Visitor& visitor) : Visitor(visitor) {}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
|
||
|
|
struct on_no_event { enum { num = detail::on_no_event_num }; };
|
||
|
|
|
||
|
|
struct on_initialize_vertex {
|
||
|
|
enum { num = detail::on_initialize_vertex_num }; };
|
||
|
|
struct on_start_vertex { enum { num = detail::on_start_vertex_num }; };
|
||
|
|
struct on_discover_vertex { enum { num = detail::on_discover_vertex_num }; };
|
||
|
|
struct on_examine_vertex { enum { num = detail::on_examine_vertex_num }; };
|
||
|
|
struct on_finish_vertex { enum { num = detail::on_finish_vertex_num }; };
|
||
|
|
|
||
|
|
struct on_examine_edge { enum { num = detail::on_examine_edge_num }; };
|
||
|
|
struct on_tree_edge { enum { num = detail::on_tree_edge_num }; };
|
||
|
|
struct on_non_tree_edge { enum { num = detail::on_non_tree_edge_num }; };
|
||
|
|
struct on_gray_target { enum { num = detail::on_gray_target_num }; };
|
||
|
|
struct on_black_target { enum { num = detail::on_black_target_num }; };
|
||
|
|
struct on_forward_or_cross_edge {
|
||
|
|
enum { num = detail::on_forward_or_cross_edge_num }; };
|
||
|
|
struct on_back_edge { enum { num = detail::on_back_edge_num }; };
|
||
|
|
struct on_finish_edge { enum { num = detail::on_finish_edge_num }; };
|
||
|
|
|
||
|
|
struct on_edge_relaxed { enum { num = detail::on_edge_relaxed_num }; };
|
||
|
|
struct on_edge_not_relaxed {
|
||
|
|
enum { num = detail::on_edge_not_relaxed_num }; };
|
||
|
|
struct on_edge_minimized { enum { num = detail::on_edge_minimized_num }; };
|
||
|
|
struct on_edge_not_minimized {
|
||
|
|
enum { num = detail::on_edge_not_minimized_num }; };
|
||
|
|
|
||
|
|
//========================================================================
|
||
|
|
// base_visitor and null_visitor
|
||
|
|
|
||
|
|
// needed for MSVC workaround
|
||
|
|
template <class Visitor>
|
||
|
|
struct base_visitor {
|
||
|
|
typedef on_no_event event_filter;
|
||
|
|
template <class T, class Graph>
|
||
|
|
void operator()(T, Graph&) { }
|
||
|
|
};
|
||
|
|
|
||
|
|
struct null_visitor : public base_visitor<null_visitor> {
|
||
|
|
typedef on_no_event event_filter;
|
||
|
|
template <class T, class Graph>
|
||
|
|
void operator()(T, Graph&) { }
|
||
|
|
};
|
||
|
|
|
||
|
|
//========================================================================
|
||
|
|
// The invoke_visitors() function
|
||
|
|
|
||
|
|
namespace detail {
|
||
|
|
template <class Visitor, class T, class Graph>
|
||
|
|
inline void invoke_dispatch(Visitor& v, T x, Graph& g, mpl::true_) {
|
||
|
|
v(x, g);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <class Visitor, class T, class Graph>
|
||
|
|
inline void invoke_dispatch(Visitor&, T, Graph&, mpl::false_)
|
||
|
|
{ }
|
||
|
|
} // namespace detail
|
||
|
|
|
||
|
|
template <class Visitor, class Rest, class T, class Graph, class Tag>
|
||
|
|
inline void
|
||
|
|
invoke_visitors(std::pair<Visitor, Rest>& vlist, T x, Graph& g, Tag tag) {
|
||
|
|
typedef typename Visitor::event_filter Category;
|
||
|
|
typedef typename is_same<Category, Tag>::type IsSameTag;
|
||
|
|
detail::invoke_dispatch(vlist.first, x, g, IsSameTag());
|
||
|
|
invoke_visitors(vlist.second, x, g, tag);
|
||
|
|
}
|
||
|
|
template <class Visitor, class T, class Graph, class Tag>
|
||
|
|
inline void
|
||
|
|
invoke_visitors(Visitor& v, T x, Graph& g, Tag) {
|
||
|
|
typedef typename Visitor::event_filter Category;
|
||
|
|
typedef typename is_same<Category, Tag>::type IsSameTag;
|
||
|
|
detail::invoke_dispatch(v, x, g, IsSameTag());
|
||
|
|
}
|
||
|
|
|
||
|
|
//========================================================================
|
||
|
|
// predecessor_recorder
|
||
|
|
|
||
|
|
template <class PredecessorMap, class Tag>
|
||
|
|
struct predecessor_recorder
|
||
|
|
: public base_visitor<predecessor_recorder<PredecessorMap, Tag> >
|
||
|
|
{
|
||
|
|
typedef Tag event_filter;
|
||
|
|
predecessor_recorder(PredecessorMap pa) : m_predecessor(pa) { }
|
||
|
|
template <class Edge, class Graph>
|
||
|
|
void operator()(Edge e, const Graph& g) {
|
||
|
|
put(m_predecessor, target(e, g), source(e, g));
|
||
|
|
}
|
||
|
|
PredecessorMap m_predecessor;
|
||
|
|
};
|
||
|
|
template <class PredecessorMap, class Tag>
|
||
|
|
predecessor_recorder<PredecessorMap, Tag>
|
||
|
|
record_predecessors(PredecessorMap pa, Tag) {
|
||
|
|
return predecessor_recorder<PredecessorMap, Tag> (pa);
|
||
|
|
}
|
||
|
|
|
||
|
|
//========================================================================
|
||
|
|
// edge_predecessor_recorder
|
||
|
|
|
||
|
|
template <class PredEdgeMap, class Tag>
|
||
|
|
struct edge_predecessor_recorder
|
||
|
|
: public base_visitor<edge_predecessor_recorder<PredEdgeMap, Tag> >
|
||
|
|
{
|
||
|
|
typedef Tag event_filter;
|
||
|
|
edge_predecessor_recorder(PredEdgeMap pa) : m_predecessor(pa) { }
|
||
|
|
template <class Edge, class Graph>
|
||
|
|
void operator()(Edge e, const Graph& g) {
|
||
|
|
put(m_predecessor, target(e, g), e);
|
||
|
|
}
|
||
|
|
PredEdgeMap m_predecessor;
|
||
|
|
};
|
||
|
|
template <class PredEdgeMap, class Tag>
|
||
|
|
edge_predecessor_recorder<PredEdgeMap, Tag>
|
||
|
|
record_edge_predecessors(PredEdgeMap pa, Tag) {
|
||
|
|
return edge_predecessor_recorder<PredEdgeMap, Tag> (pa);
|
||
|
|
}
|
||
|
|
|
||
|
|
//========================================================================
|
||
|
|
// distance_recorder
|
||
|
|
|
||
|
|
template <class DistanceMap, class Tag>
|
||
|
|
struct distance_recorder
|
||
|
|
: public base_visitor<distance_recorder<DistanceMap, Tag> >
|
||
|
|
{
|
||
|
|
typedef Tag event_filter;
|
||
|
|
distance_recorder(DistanceMap pa) : m_distance(pa) { }
|
||
|
|
template <class Edge, class Graph>
|
||
|
|
void operator()(Edge e, const Graph& g) {
|
||
|
|
typename graph_traits<Graph>::vertex_descriptor
|
||
|
|
u = source(e, g), v = target(e, g);
|
||
|
|
put(m_distance, v, get(m_distance, u) + 1);
|
||
|
|
}
|
||
|
|
DistanceMap m_distance;
|
||
|
|
};
|
||
|
|
template <class DistanceMap, class Tag>
|
||
|
|
distance_recorder<DistanceMap, Tag>
|
||
|
|
record_distances(DistanceMap pa, Tag) {
|
||
|
|
return distance_recorder<DistanceMap, Tag> (pa);
|
||
|
|
}
|
||
|
|
|
||
|
|
//========================================================================
|
||
|
|
// time_stamper
|
||
|
|
|
||
|
|
|
||
|
|
template <class TimeMap, class TimeT, class Tag>
|
||
|
|
struct time_stamper
|
||
|
|
: public base_visitor<time_stamper<TimeMap, TimeT, Tag> >
|
||
|
|
{
|
||
|
|
typedef Tag event_filter;
|
||
|
|
time_stamper(TimeMap pa, TimeT& t) : m_time_pa(pa), m_time(t) { }
|
||
|
|
template <class Vertex, class Graph>
|
||
|
|
void operator()(Vertex u, const Graph&) {
|
||
|
|
put(m_time_pa, u, ++m_time);
|
||
|
|
}
|
||
|
|
TimeMap m_time_pa;
|
||
|
|
TimeT& m_time;
|
||
|
|
};
|
||
|
|
template <class TimeMap, class TimeT, class Tag>
|
||
|
|
time_stamper<TimeMap, TimeT, Tag>
|
||
|
|
stamp_times(TimeMap pa, TimeT& time_counter, Tag) {
|
||
|
|
return time_stamper<TimeMap, TimeT, Tag>(pa, time_counter);
|
||
|
|
}
|
||
|
|
|
||
|
|
//========================================================================
|
||
|
|
// property_writer
|
||
|
|
|
||
|
|
template <class PA, class OutputIterator, class Tag>
|
||
|
|
struct property_writer
|
||
|
|
: public base_visitor<property_writer<PA, OutputIterator, Tag> >
|
||
|
|
{
|
||
|
|
typedef Tag event_filter;
|
||
|
|
|
||
|
|
property_writer(PA pa, OutputIterator out) : m_pa(pa), m_out(out) { }
|
||
|
|
|
||
|
|
template <class T, class Graph>
|
||
|
|
void operator()(T x, Graph&) { *m_out++ = get(m_pa, x); }
|
||
|
|
PA m_pa;
|
||
|
|
OutputIterator m_out;
|
||
|
|
};
|
||
|
|
template <class PA, class OutputIterator, class Tag>
|
||
|
|
property_writer<PA, OutputIterator, Tag>
|
||
|
|
write_property(PA pa, OutputIterator out, Tag) {
|
||
|
|
return property_writer<PA, OutputIterator, Tag>(pa, out);
|
||
|
|
}
|
||
|
|
|
||
|
|
//========================================================================
|
||
|
|
// property_put
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Functor which just sets a given value to a vertex or edge in a property map.
|
||
|
|
*/
|
||
|
|
|
||
|
|
template <typename PropertyMap, typename EventTag>
|
||
|
|
struct property_put
|
||
|
|
{
|
||
|
|
typedef EventTag event_filter;
|
||
|
|
|
||
|
|
property_put (PropertyMap property_map,
|
||
|
|
typename property_traits <PropertyMap>::value_type value) :
|
||
|
|
property_map_ (property_map), value_ (value)
|
||
|
|
{}
|
||
|
|
|
||
|
|
template <typename VertexOrEdge, typename Graph>
|
||
|
|
void operator() (VertexOrEdge v, const Graph&)
|
||
|
|
{
|
||
|
|
put (property_map_, v, value_);
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
PropertyMap property_map_;
|
||
|
|
typename property_traits <PropertyMap>::value_type value_;
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Creates a property_put functor which just sets a given value to a vertex or edge.
|
||
|
|
*
|
||
|
|
* @param property_map Given writeable property map
|
||
|
|
* @param value Fixed value of the map
|
||
|
|
* @param tag Event Filter
|
||
|
|
* @return The functor.
|
||
|
|
*/
|
||
|
|
|
||
|
|
template <typename PropertyMap, typename EventTag>
|
||
|
|
inline property_put <PropertyMap, EventTag>
|
||
|
|
put_property (PropertyMap property_map,
|
||
|
|
typename property_traits <PropertyMap>::value_type value,
|
||
|
|
EventTag)
|
||
|
|
{
|
||
|
|
return property_put <PropertyMap, EventTag> (property_map, value);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define BOOST_GRAPH_EVENT_STUB(Event,Kind) \
|
||
|
|
typedef ::boost::Event Event##_type; \
|
||
|
|
template<typename Visitor> \
|
||
|
|
Kind##_visitor<std::pair<detail::functor_to_visitor<Event##_type, \
|
||
|
|
Visitor>, Visitors> > \
|
||
|
|
do_##Event(Visitor visitor) \
|
||
|
|
{ \
|
||
|
|
typedef std::pair<detail::functor_to_visitor<Event##_type, Visitor>, \
|
||
|
|
Visitors> visitor_list; \
|
||
|
|
typedef Kind##_visitor<visitor_list> result_type; \
|
||
|
|
return result_type(visitor_list(visitor, m_vis)); \
|
||
|
|
}
|
||
|
|
|
||
|
|
} /* namespace boost */
|
||
|
|
|
||
|
|
#endif
|