mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-22 04:41:43 +03:00
414 lines
15 KiB
C++
414 lines
15 KiB
C++
//
|
|
//=======================================================================
|
|
// 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)
|
|
//=======================================================================
|
|
//
|
|
#ifndef BOOST_GRAPH_BREADTH_FIRST_SEARCH_HPP
|
|
#define BOOST_GRAPH_BREADTH_FIRST_SEARCH_HPP
|
|
|
|
/*
|
|
Breadth First Search Algorithm (Cormen, Leiserson, and Rivest p. 470)
|
|
*/
|
|
#include <boost/config.hpp>
|
|
#include <vector>
|
|
#include <boost/pending/queue.hpp>
|
|
#include <boost/graph/graph_traits.hpp>
|
|
#include <boost/graph/graph_concepts.hpp>
|
|
#include <boost/graph/visitors.hpp>
|
|
#include <boost/graph/named_function_params.hpp>
|
|
#include <boost/graph/overloading.hpp>
|
|
#include <boost/graph/graph_concepts.hpp>
|
|
#include <boost/graph/two_bit_color_map.hpp>
|
|
#include <boost/concept/assert.hpp>
|
|
|
|
#ifdef BOOST_GRAPH_USE_MPI
|
|
#include <boost/graph/distributed/concepts.hpp>
|
|
#endif // BOOST_GRAPH_USE_MPI
|
|
|
|
namespace boost {
|
|
|
|
template <class Visitor, class Graph>
|
|
struct BFSVisitorConcept {
|
|
void constraints() {
|
|
BOOST_CONCEPT_ASSERT(( CopyConstructibleConcept<Visitor> ));
|
|
vis.initialize_vertex(u, g);
|
|
vis.discover_vertex(u, g);
|
|
vis.examine_vertex(u, g);
|
|
vis.examine_edge(e, g);
|
|
vis.tree_edge(e, g);
|
|
vis.non_tree_edge(e, g);
|
|
vis.gray_target(e, g);
|
|
vis.black_target(e, g);
|
|
vis.finish_vertex(u, g);
|
|
}
|
|
Visitor vis;
|
|
Graph g;
|
|
typename graph_traits<Graph>::vertex_descriptor u;
|
|
typename graph_traits<Graph>::edge_descriptor e;
|
|
};
|
|
|
|
|
|
// Multiple-source version
|
|
template <class IncidenceGraph, class Buffer, class BFSVisitor,
|
|
class ColorMap, class SourceIterator>
|
|
void breadth_first_visit
|
|
(const IncidenceGraph& g,
|
|
SourceIterator sources_begin, SourceIterator sources_end,
|
|
Buffer& Q, BFSVisitor vis, ColorMap color)
|
|
{
|
|
BOOST_CONCEPT_ASSERT(( IncidenceGraphConcept<IncidenceGraph> ));
|
|
typedef graph_traits<IncidenceGraph> GTraits;
|
|
typedef typename GTraits::vertex_descriptor Vertex;
|
|
BOOST_CONCEPT_ASSERT(( BFSVisitorConcept<BFSVisitor, IncidenceGraph> ));
|
|
BOOST_CONCEPT_ASSERT(( ReadWritePropertyMapConcept<ColorMap, Vertex> ));
|
|
typedef typename property_traits<ColorMap>::value_type ColorValue;
|
|
typedef color_traits<ColorValue> Color;
|
|
typename GTraits::out_edge_iterator ei, ei_end;
|
|
|
|
for (; sources_begin != sources_end; ++sources_begin) {
|
|
Vertex s = *sources_begin;
|
|
put(color, s, Color::gray()); vis.discover_vertex(s, g);
|
|
Q.push(s);
|
|
}
|
|
while (! Q.empty()) {
|
|
Vertex u = Q.top(); Q.pop(); vis.examine_vertex(u, g);
|
|
for (boost::tie(ei, ei_end) = out_edges(u, g); ei != ei_end; ++ei) {
|
|
Vertex v = target(*ei, g); vis.examine_edge(*ei, g);
|
|
ColorValue v_color = get(color, v);
|
|
if (v_color == Color::white()) { vis.tree_edge(*ei, g);
|
|
put(color, v, Color::gray()); vis.discover_vertex(v, g);
|
|
Q.push(v);
|
|
} else { vis.non_tree_edge(*ei, g);
|
|
if (v_color == Color::gray()) vis.gray_target(*ei, g);
|
|
else vis.black_target(*ei, g);
|
|
}
|
|
} // end for
|
|
put(color, u, Color::black()); vis.finish_vertex(u, g);
|
|
} // end while
|
|
} // breadth_first_visit
|
|
|
|
// Single-source version
|
|
template <class IncidenceGraph, class Buffer, class BFSVisitor,
|
|
class ColorMap>
|
|
void breadth_first_visit
|
|
(const IncidenceGraph& g,
|
|
typename graph_traits<IncidenceGraph>::vertex_descriptor s,
|
|
Buffer& Q, BFSVisitor vis, ColorMap color)
|
|
{
|
|
typename graph_traits<IncidenceGraph>::vertex_descriptor sources[1] = {s};
|
|
breadth_first_visit(g, sources, sources + 1, Q, vis, color);
|
|
}
|
|
|
|
|
|
template <class VertexListGraph, class SourceIterator,
|
|
class Buffer, class BFSVisitor,
|
|
class ColorMap>
|
|
void breadth_first_search
|
|
(const VertexListGraph& g,
|
|
SourceIterator sources_begin, SourceIterator sources_end,
|
|
Buffer& Q, BFSVisitor vis, ColorMap color)
|
|
{
|
|
// Initialization
|
|
typedef typename property_traits<ColorMap>::value_type ColorValue;
|
|
typedef color_traits<ColorValue> Color;
|
|
typename boost::graph_traits<VertexListGraph>::vertex_iterator i, i_end;
|
|
for (boost::tie(i, i_end) = vertices(g); i != i_end; ++i) {
|
|
vis.initialize_vertex(*i, g);
|
|
put(color, *i, Color::white());
|
|
}
|
|
breadth_first_visit(g, sources_begin, sources_end, Q, vis, color);
|
|
}
|
|
|
|
template <class VertexListGraph, class Buffer, class BFSVisitor,
|
|
class ColorMap>
|
|
void breadth_first_search
|
|
(const VertexListGraph& g,
|
|
typename graph_traits<VertexListGraph>::vertex_descriptor s,
|
|
Buffer& Q, BFSVisitor vis, ColorMap color)
|
|
{
|
|
typename graph_traits<VertexListGraph>::vertex_descriptor sources[1] = {s};
|
|
breadth_first_search(g, sources, sources + 1, Q, vis, color);
|
|
}
|
|
|
|
namespace graph { struct bfs_visitor_event_not_overridden {}; }
|
|
|
|
|
|
template <class Visitors = null_visitor>
|
|
class bfs_visitor {
|
|
public:
|
|
bfs_visitor() { }
|
|
bfs_visitor(Visitors vis) : m_vis(vis) { }
|
|
|
|
template <class Vertex, class Graph>
|
|
graph::bfs_visitor_event_not_overridden
|
|
initialize_vertex(Vertex u, Graph& g)
|
|
{
|
|
invoke_visitors(m_vis, u, g, ::boost::on_initialize_vertex());
|
|
return graph::bfs_visitor_event_not_overridden();
|
|
}
|
|
|
|
template <class Vertex, class Graph>
|
|
graph::bfs_visitor_event_not_overridden
|
|
discover_vertex(Vertex u, Graph& g)
|
|
{
|
|
invoke_visitors(m_vis, u, g, ::boost::on_discover_vertex());
|
|
return graph::bfs_visitor_event_not_overridden();
|
|
}
|
|
|
|
template <class Vertex, class Graph>
|
|
graph::bfs_visitor_event_not_overridden
|
|
examine_vertex(Vertex u, Graph& g)
|
|
{
|
|
invoke_visitors(m_vis, u, g, ::boost::on_examine_vertex());
|
|
return graph::bfs_visitor_event_not_overridden();
|
|
}
|
|
|
|
template <class Edge, class Graph>
|
|
graph::bfs_visitor_event_not_overridden
|
|
examine_edge(Edge e, Graph& g)
|
|
{
|
|
invoke_visitors(m_vis, e, g, ::boost::on_examine_edge());
|
|
return graph::bfs_visitor_event_not_overridden();
|
|
}
|
|
|
|
template <class Edge, class Graph>
|
|
graph::bfs_visitor_event_not_overridden
|
|
tree_edge(Edge e, Graph& g)
|
|
{
|
|
invoke_visitors(m_vis, e, g, ::boost::on_tree_edge());
|
|
return graph::bfs_visitor_event_not_overridden();
|
|
}
|
|
|
|
template <class Edge, class Graph>
|
|
graph::bfs_visitor_event_not_overridden
|
|
non_tree_edge(Edge e, Graph& g)
|
|
{
|
|
invoke_visitors(m_vis, e, g, ::boost::on_non_tree_edge());
|
|
return graph::bfs_visitor_event_not_overridden();
|
|
}
|
|
|
|
template <class Edge, class Graph>
|
|
graph::bfs_visitor_event_not_overridden
|
|
gray_target(Edge e, Graph& g)
|
|
{
|
|
invoke_visitors(m_vis, e, g, ::boost::on_gray_target());
|
|
return graph::bfs_visitor_event_not_overridden();
|
|
}
|
|
|
|
template <class Edge, class Graph>
|
|
graph::bfs_visitor_event_not_overridden
|
|
black_target(Edge e, Graph& g)
|
|
{
|
|
invoke_visitors(m_vis, e, g, ::boost::on_black_target());
|
|
return graph::bfs_visitor_event_not_overridden();
|
|
}
|
|
|
|
template <class Vertex, class Graph>
|
|
graph::bfs_visitor_event_not_overridden
|
|
finish_vertex(Vertex u, Graph& g)
|
|
{
|
|
invoke_visitors(m_vis, u, g, ::boost::on_finish_vertex());
|
|
return graph::bfs_visitor_event_not_overridden();
|
|
}
|
|
|
|
BOOST_GRAPH_EVENT_STUB(on_initialize_vertex,bfs)
|
|
BOOST_GRAPH_EVENT_STUB(on_discover_vertex,bfs)
|
|
BOOST_GRAPH_EVENT_STUB(on_examine_vertex,bfs)
|
|
BOOST_GRAPH_EVENT_STUB(on_examine_edge,bfs)
|
|
BOOST_GRAPH_EVENT_STUB(on_tree_edge,bfs)
|
|
BOOST_GRAPH_EVENT_STUB(on_non_tree_edge,bfs)
|
|
BOOST_GRAPH_EVENT_STUB(on_gray_target,bfs)
|
|
BOOST_GRAPH_EVENT_STUB(on_black_target,bfs)
|
|
BOOST_GRAPH_EVENT_STUB(on_finish_vertex,bfs)
|
|
|
|
protected:
|
|
Visitors m_vis;
|
|
};
|
|
template <class Visitors>
|
|
bfs_visitor<Visitors>
|
|
make_bfs_visitor(Visitors vis) {
|
|
return bfs_visitor<Visitors>(vis);
|
|
}
|
|
typedef bfs_visitor<> default_bfs_visitor;
|
|
|
|
|
|
namespace detail {
|
|
|
|
template <class VertexListGraph, class ColorMap, class BFSVisitor,
|
|
class P, class T, class R>
|
|
void bfs_helper
|
|
(VertexListGraph& g,
|
|
typename graph_traits<VertexListGraph>::vertex_descriptor s,
|
|
ColorMap color,
|
|
BFSVisitor vis,
|
|
const bgl_named_params<P, T, R>& params,
|
|
boost::mpl::false_)
|
|
{
|
|
typedef graph_traits<VertexListGraph> Traits;
|
|
// Buffer default
|
|
typedef typename Traits::vertex_descriptor Vertex;
|
|
typedef boost::queue<Vertex> queue_t;
|
|
queue_t Q;
|
|
breadth_first_search
|
|
(g, s,
|
|
choose_param(get_param(params, buffer_param_t()), boost::ref(Q)).get(),
|
|
vis, color);
|
|
}
|
|
|
|
#ifdef BOOST_GRAPH_USE_MPI
|
|
template <class DistributedGraph, class ColorMap, class BFSVisitor,
|
|
class P, class T, class R>
|
|
void bfs_helper
|
|
(DistributedGraph& g,
|
|
typename graph_traits<DistributedGraph>::vertex_descriptor s,
|
|
ColorMap color,
|
|
BFSVisitor vis,
|
|
const bgl_named_params<P, T, R>& params,
|
|
boost::mpl::true_);
|
|
#endif // BOOST_GRAPH_USE_MPI
|
|
|
|
//-------------------------------------------------------------------------
|
|
// Choose between default color and color parameters. Using
|
|
// function dispatching so that we don't require vertex index if
|
|
// the color default is not being used.
|
|
|
|
template <class ColorMap>
|
|
struct bfs_dispatch {
|
|
template <class VertexListGraph, class P, class T, class R>
|
|
static void apply
|
|
(VertexListGraph& g,
|
|
typename graph_traits<VertexListGraph>::vertex_descriptor s,
|
|
const bgl_named_params<P, T, R>& params,
|
|
ColorMap color)
|
|
{
|
|
bfs_helper
|
|
(g, s, color,
|
|
choose_param(get_param(params, graph_visitor),
|
|
make_bfs_visitor(null_visitor())),
|
|
params,
|
|
boost::mpl::bool_<
|
|
boost::is_base_and_derived<
|
|
distributed_graph_tag,
|
|
typename graph_traits<VertexListGraph>::traversal_category>::value>());
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct bfs_dispatch<param_not_found> {
|
|
template <class VertexListGraph, class P, class T, class R>
|
|
static void apply
|
|
(VertexListGraph& g,
|
|
typename graph_traits<VertexListGraph>::vertex_descriptor s,
|
|
const bgl_named_params<P, T, R>& params,
|
|
param_not_found)
|
|
{
|
|
null_visitor null_vis;
|
|
|
|
bfs_helper
|
|
(g, s,
|
|
make_two_bit_color_map
|
|
(num_vertices(g),
|
|
choose_const_pmap(get_param(params, vertex_index),
|
|
g, vertex_index)),
|
|
choose_param(get_param(params, graph_visitor),
|
|
make_bfs_visitor(null_vis)),
|
|
params,
|
|
boost::mpl::bool_<
|
|
boost::is_base_and_derived<
|
|
distributed_graph_tag,
|
|
typename graph_traits<VertexListGraph>::traversal_category>::value>());
|
|
}
|
|
};
|
|
|
|
} // namespace detail
|
|
|
|
#if 1
|
|
// Named Parameter Variant
|
|
template <class VertexListGraph, class P, class T, class R>
|
|
void breadth_first_search
|
|
(const VertexListGraph& g,
|
|
typename graph_traits<VertexListGraph>::vertex_descriptor s,
|
|
const bgl_named_params<P, T, R>& params)
|
|
{
|
|
// The graph is passed by *const* reference so that graph adaptors
|
|
// (temporaries) can be passed into this function. However, the
|
|
// graph is not really const since we may write to property maps
|
|
// of the graph.
|
|
VertexListGraph& ng = const_cast<VertexListGraph&>(g);
|
|
typedef typename get_param_type< vertex_color_t, bgl_named_params<P,T,R> >::type C;
|
|
detail::bfs_dispatch<C>::apply(ng, s, params,
|
|
get_param(params, vertex_color));
|
|
}
|
|
#endif
|
|
|
|
|
|
// This version does not initialize colors, user has to.
|
|
|
|
template <class IncidenceGraph, class P, class T, class R>
|
|
void breadth_first_visit
|
|
(const IncidenceGraph& g,
|
|
typename graph_traits<IncidenceGraph>::vertex_descriptor s,
|
|
const bgl_named_params<P, T, R>& params)
|
|
{
|
|
// The graph is passed by *const* reference so that graph adaptors
|
|
// (temporaries) can be passed into this function. However, the
|
|
// graph is not really const since we may write to property maps
|
|
// of the graph.
|
|
IncidenceGraph& ng = const_cast<IncidenceGraph&>(g);
|
|
|
|
typedef graph_traits<IncidenceGraph> Traits;
|
|
// Buffer default
|
|
typedef typename Traits::vertex_descriptor vertex_descriptor;
|
|
typedef boost::queue<vertex_descriptor> queue_t;
|
|
queue_t Q;
|
|
|
|
breadth_first_visit
|
|
(ng, s,
|
|
choose_param(get_param(params, buffer_param_t()), boost::ref(Q)).get(),
|
|
choose_param(get_param(params, graph_visitor),
|
|
make_bfs_visitor(null_visitor())),
|
|
choose_pmap(get_param(params, vertex_color), ng, vertex_color)
|
|
);
|
|
}
|
|
|
|
namespace graph {
|
|
namespace detail {
|
|
template <typename Graph, typename Source>
|
|
struct breadth_first_search_impl {
|
|
typedef void result_type;
|
|
template <typename ArgPack>
|
|
void operator()(const Graph& g, const Source& source, const ArgPack& arg_pack) {
|
|
using namespace boost::graph::keywords;
|
|
typename boost::graph_traits<Graph>::vertex_descriptor sources[1] = {source};
|
|
boost::queue<typename boost::graph_traits<Graph>::vertex_descriptor> Q;
|
|
boost::breadth_first_search(g,
|
|
&sources[0],
|
|
&sources[1],
|
|
boost::unwrap_ref(arg_pack[_buffer | boost::ref(Q)]),
|
|
arg_pack[_visitor | make_bfs_visitor(null_visitor())],
|
|
boost::detail::make_color_map_from_arg_pack(g, arg_pack));
|
|
}
|
|
};
|
|
}
|
|
BOOST_GRAPH_MAKE_FORWARDING_FUNCTION(breadth_first_search, 2, 4)
|
|
}
|
|
|
|
#if 0
|
|
// Named Parameter Variant
|
|
BOOST_GRAPH_MAKE_OLD_STYLE_PARAMETER_FUNCTION(breadth_first_search, 2)
|
|
#endif
|
|
|
|
} // namespace boost
|
|
|
|
#ifdef BOOST_GRAPH_USE_MPI
|
|
# include <boost/graph/distributed/breadth_first_search.hpp>
|
|
#endif
|
|
|
|
#endif // BOOST_GRAPH_BREADTH_FIRST_SEARCH_HPP
|
|
|