boost/graph/detail/compressed_sparse_row_struct.hpp
// Copyright 2005-2009 The Trustees of Indiana University.
// 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)
// Authors: Jeremiah Willcock
// Douglas Gregor
// Andrew Lumsdaine
// Compressed sparse row graph type internal structure
#ifndef BOOST_GRAPH_COMPRESSED_SPARSE_ROW_STRUCT_HPP
#define BOOST_GRAPH_COMPRESSED_SPARSE_ROW_STRUCT_HPP
#ifndef BOOST_GRAPH_COMPRESSED_SPARSE_ROW_GRAPH_HPP
#error This file should only be included from boost/graph/compressed_sparse_row_graph.hpp
#endif
#include <vector>
#include <utility>
#include <algorithm>
#include <climits>
#include <boost/assert.hpp>
#include <iterator>
#if 0
#include <iostream> // For some debugging code below
#endif
#include <boost/graph/graph_traits.hpp>
#include <boost/graph/properties.hpp>
#include <boost/graph/filtered_graph.hpp> // For keep_all
#include <boost/graph/detail/indexed_properties.hpp>
#include <boost/graph/detail/histogram_sort.hpp>
#include <boost/graph/iteration_macros.hpp>
#include <boost/iterator/counting_iterator.hpp>
#include <boost/iterator/reverse_iterator.hpp>
#include <boost/iterator/zip_iterator.hpp>
#include <boost/iterator/transform_iterator.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/property_map/property_map.hpp>
#include <boost/integer.hpp>
#include <boost/iterator/iterator_facade.hpp>
#include <boost/mpl/if.hpp>
#include <boost/graph/graph_selectors.hpp>
#include <boost/static_assert.hpp>
#include <boost/functional/hash.hpp>
namespace boost
{
namespace detail
{
// Forward declaration of CSR edge descriptor type, needed to pass to
// indexed_edge_properties.
template < typename Vertex, typename EdgeIndex > class csr_edge_descriptor;
// Add edge_index property map
template < typename Vertex, typename EdgeIndex > struct csr_edge_index_map
{
typedef EdgeIndex value_type;
typedef EdgeIndex reference;
typedef csr_edge_descriptor< Vertex, EdgeIndex > key_type;
typedef readable_property_map_tag category;
};
template < typename Vertex, typename EdgeIndex >
inline EdgeIndex get(const csr_edge_index_map< Vertex, EdgeIndex >&,
const csr_edge_descriptor< Vertex, EdgeIndex >& key)
{
return key.idx;
}
/** Compressed sparse row graph internal structure.
*
* Vertex and EdgeIndex should be unsigned integral types and should
* specialize numeric_limits.
*/
template < typename EdgeProperty, typename Vertex = std::size_t,
typename EdgeIndex = Vertex >
class compressed_sparse_row_structure
: public detail::indexed_edge_properties<
compressed_sparse_row_structure< EdgeProperty, Vertex, EdgeIndex >,
EdgeProperty, csr_edge_descriptor< Vertex, EdgeIndex >,
csr_edge_index_map< Vertex, EdgeIndex > >
{
public:
typedef detail::indexed_edge_properties<
compressed_sparse_row_structure< EdgeProperty, Vertex, EdgeIndex >,
EdgeProperty, csr_edge_descriptor< Vertex, EdgeIndex >,
csr_edge_index_map< Vertex, EdgeIndex > >
inherited_edge_properties;
typedef Vertex vertices_size_type;
typedef Vertex vertex_descriptor;
typedef EdgeIndex edges_size_type;
static vertex_descriptor null_vertex() { return vertex_descriptor(-1); }
std::vector< EdgeIndex > m_rowstart;
std::vector< Vertex > m_column;
compressed_sparse_row_structure(Vertex numverts = 0)
: m_rowstart(numverts + 1, EdgeIndex(0)), m_column()
{
}
// Rebuild graph from number of vertices and multi-pass unsorted list
// of edges (filtered using source_pred and mapped using
// global_to_local)
template < typename MultiPassInputIterator, typename GlobalToLocal,
typename SourcePred >
void assign_unsorted_multi_pass_edges(MultiPassInputIterator edge_begin,
MultiPassInputIterator edge_end, vertices_size_type numlocalverts,
const GlobalToLocal& global_to_local, const SourcePred& source_pred)
{
m_rowstart.clear();
m_rowstart.resize(numlocalverts + 1, 0);
typedef std::pair< vertices_size_type, vertices_size_type >
edge_type;
typedef boost::transform_iterator<
boost::graph::detail::project1st< edge_type >,
MultiPassInputIterator >
source_iterator;
typedef boost::transform_iterator<
boost::graph::detail::project2nd< edge_type >,
MultiPassInputIterator >
target_iterator;
source_iterator sources_begin(
edge_begin, boost::graph::detail::project1st< edge_type >());
source_iterator sources_end(
edge_end, boost::graph::detail::project1st< edge_type >());
target_iterator targets_begin(
edge_begin, boost::graph::detail::project2nd< edge_type >());
target_iterator targets_end(
edge_end, boost::graph::detail::project2nd< edge_type >());
boost::graph::detail::count_starts(sources_begin, sources_end,
m_rowstart.begin(), numlocalverts, source_pred,
boost::make_property_map_function(global_to_local));
m_column.resize(m_rowstart.back());
inherited_edge_properties::resize(m_rowstart.back());
boost::graph::detail::histogram_sort(sources_begin, sources_end,
m_rowstart.begin(), numlocalverts, targets_begin,
m_column.begin(), source_pred,
boost::make_property_map_function(global_to_local));
}
// Rebuild graph from number of vertices and multi-pass unsorted list
// of edges and their properties (filtered using source_pred and mapped
// using global_to_local)
template < typename MultiPassInputIterator,
typename EdgePropertyIterator, typename GlobalToLocal,
typename SourcePred >
void assign_unsorted_multi_pass_edges(MultiPassInputIterator edge_begin,
MultiPassInputIterator edge_end, EdgePropertyIterator ep_iter,
vertices_size_type numlocalverts,
const GlobalToLocal& global_to_local, const SourcePred& source_pred)
{
m_rowstart.clear();
m_rowstart.resize(numlocalverts + 1, 0);
typedef std::pair< vertices_size_type, vertices_size_type >
edge_type;
typedef boost::transform_iterator<
boost::graph::detail::project1st< edge_type >,
MultiPassInputIterator >
source_iterator;
typedef boost::transform_iterator<
boost::graph::detail::project2nd< edge_type >,
MultiPassInputIterator >
target_iterator;
source_iterator sources_begin(
edge_begin, boost::graph::detail::project1st< edge_type >());
source_iterator sources_end(
edge_end, boost::graph::detail::project1st< edge_type >());
target_iterator targets_begin(
edge_begin, boost::graph::detail::project2nd< edge_type >());
target_iterator targets_end(
edge_end, boost::graph::detail::project2nd< edge_type >());
boost::graph::detail::count_starts(sources_begin, sources_end,
m_rowstart.begin(), numlocalverts, source_pred,
boost::make_property_map_function(global_to_local));
m_column.resize(m_rowstart.back());
inherited_edge_properties::resize(m_rowstart.back());
boost::graph::detail::histogram_sort(sources_begin, sources_end,
m_rowstart.begin(), numlocalverts, targets_begin,
m_column.begin(), ep_iter, inherited_edge_properties::begin(),
source_pred,
boost::make_property_map_function(global_to_local));
}
// Assign from number of vertices and sorted list of edges
template < typename InputIterator, typename GlobalToLocal,
typename SourcePred >
void assign_from_sorted_edges(InputIterator edge_begin,
InputIterator edge_end, const GlobalToLocal& global_to_local,
const SourcePred& source_pred, vertices_size_type numlocalverts,
edges_size_type numedges_or_zero)
{
m_column.clear();
m_column.reserve(numedges_or_zero);
m_rowstart.resize(numlocalverts + 1);
EdgeIndex current_edge = 0;
Vertex current_vertex_plus_one = 1;
m_rowstart[0] = 0;
for (InputIterator ei = edge_begin; ei != edge_end; ++ei)
{
if (!source_pred(ei->first))
continue;
Vertex src = get(global_to_local, ei->first);
Vertex tgt = ei->second;
for (; current_vertex_plus_one != src + 1;
++current_vertex_plus_one)
m_rowstart[current_vertex_plus_one] = current_edge;
m_column.push_back(tgt);
++current_edge;
}
// The remaining vertices have no edges
for (; current_vertex_plus_one != numlocalverts + 1;
++current_vertex_plus_one)
m_rowstart[current_vertex_plus_one] = current_edge;
// Default-construct properties for edges
inherited_edge_properties::resize(m_column.size());
}
// Assign from number of vertices and sorted list of edges
template < typename InputIterator, typename EdgePropertyIterator,
typename GlobalToLocal, typename SourcePred >
void assign_from_sorted_edges(InputIterator edge_begin,
InputIterator edge_end, EdgePropertyIterator ep_iter,
const GlobalToLocal& global_to_local, const SourcePred& source_pred,
vertices_size_type numlocalverts, edges_size_type numedges_or_zero)
{
// Reserving storage in advance can save us lots of time and
// memory, but it can only be done if we have forward iterators or
// the user has supplied the number of edges.
edges_size_type numedges = numedges_or_zero;
if (numedges == 0)
{
numedges = boost::graph::detail::reserve_count_for_single_pass(
edge_begin, edge_end);
}
m_column.clear();
m_column.reserve(numedges_or_zero);
inherited_edge_properties::clear();
inherited_edge_properties::reserve(numedges_or_zero);
m_rowstart.resize(numlocalverts + 1);
EdgeIndex current_edge = 0;
Vertex current_vertex_plus_one = 1;
m_rowstart[0] = 0;
for (InputIterator ei = edge_begin; ei != edge_end; ++ei, ++ep_iter)
{
if (!source_pred(ei->first))
continue;
Vertex src = get(global_to_local, ei->first);
Vertex tgt = ei->second;
for (; current_vertex_plus_one != src + 1;
++current_vertex_plus_one)
m_rowstart[current_vertex_plus_one] = current_edge;
m_column.push_back(tgt);
inherited_edge_properties::push_back(*ep_iter);
++current_edge;
}
// The remaining vertices have no edges
for (; current_vertex_plus_one != numlocalverts + 1;
++current_vertex_plus_one)
m_rowstart[current_vertex_plus_one] = current_edge;
}
// Replace graph with sources and targets given, sorting them in-place,
// and using the given global-to-local property map to get local indices
// from global ones in the two arrays.
template < typename GlobalToLocal >
void assign_sources_and_targets_global(
std::vector< vertex_descriptor >& sources,
std::vector< vertex_descriptor >& targets,
vertices_size_type numverts, GlobalToLocal global_to_local)
{
BOOST_ASSERT(sources.size() == targets.size());
// Do an in-place histogram sort (at least that's what I think it
// is) to sort sources and targets
m_rowstart.clear();
m_rowstart.resize(numverts + 1);
boost::graph::detail::count_starts(sources.begin(), sources.end(),
m_rowstart.begin(), numverts, keep_all(),
boost::make_property_map_function(global_to_local));
boost::graph::detail::histogram_sort_inplace(sources.begin(),
m_rowstart.begin(), numverts, targets.begin(),
boost::make_property_map_function(global_to_local));
// Now targets is the correct vector (properly sorted by source) for
// m_column
m_column.swap(targets);
inherited_edge_properties::resize(m_rowstart.back());
}
// Replace graph with sources and targets and edge properties given,
// sorting them in-place, and using the given global-to-local property
// map to get local indices from global ones in the two arrays.
template < typename GlobalToLocal >
void assign_sources_and_targets_global(
std::vector< vertex_descriptor >& sources,
std::vector< vertex_descriptor >& targets,
std::vector< typename inherited_edge_properties::edge_bundled >&
edge_props,
vertices_size_type numverts, GlobalToLocal global_to_local)
{
BOOST_ASSERT(sources.size() == targets.size());
BOOST_ASSERT(sources.size() == edge_props.size());
// Do an in-place histogram sort (at least that's what I think it
// is) to sort sources and targets
m_rowstart.clear();
m_rowstart.resize(numverts + 1);
boost::graph::detail::count_starts(sources.begin(), sources.end(),
m_rowstart.begin(), numverts, keep_all(),
boost::make_property_map_function(global_to_local));
boost::graph::detail::histogram_sort_inplace(sources.begin(),
m_rowstart.begin(), numverts, targets.begin(),
edge_props.begin(),
boost::make_property_map_function(global_to_local));
// Now targets is the correct vector (properly sorted by source) for
// m_column, and edge_props for m_edge_properties
m_column.swap(targets);
this->m_edge_properties.swap(edge_props);
}
// From any graph (slow and uses a lot of memory)
// Requires IncidenceGraph and a vertex index map
// Internal helper function
// Note that numedges must be doubled for undirected source graphs
template < typename Graph, typename VertexIndexMap >
void assign(const Graph& g, const VertexIndexMap& vi,
vertices_size_type numverts, edges_size_type numedges)
{
m_rowstart.resize(numverts + 1);
m_column.resize(numedges);
inherited_edge_properties::resize(numedges);
EdgeIndex current_edge = 0;
typedef typename boost::graph_traits< Graph >::vertex_descriptor
g_vertex;
typedef typename boost::graph_traits< Graph >::out_edge_iterator
g_out_edge_iter;
std::vector< g_vertex > ordered_verts_of_g(numverts);
BGL_FORALL_VERTICES_T(v, g, Graph)
{
ordered_verts_of_g[get(vertex_index, g, v)] = v;
}
for (Vertex i = 0; i != numverts; ++i)
{
m_rowstart[i] = current_edge;
g_vertex v = ordered_verts_of_g[i];
g_out_edge_iter ei, ei_end;
for (boost::tie(ei, ei_end) = out_edges(v, g); ei != ei_end;
++ei)
{
m_column[current_edge++] = get(vi, target(*ei, g));
}
}
m_rowstart[numverts] = current_edge;
}
// Add edges from a sorted (smallest sources first) range of pairs and
// edge properties
template < typename BidirectionalIteratorOrig, typename EPIterOrig,
typename GlobalToLocal >
void add_edges_sorted_internal(BidirectionalIteratorOrig first_sorted,
BidirectionalIteratorOrig last_sorted, EPIterOrig ep_iter_sorted,
const GlobalToLocal& global_to_local)
{
typedef boost::reverse_iterator< BidirectionalIteratorOrig >
BidirectionalIterator;
typedef boost::reverse_iterator< EPIterOrig > EPIter;
// Flip sequence
BidirectionalIterator first(last_sorted);
BidirectionalIterator last(first_sorted);
typedef Vertex vertex_num;
typedef EdgeIndex edge_num;
edge_num new_edge_count = std::distance(first, last);
EPIter ep_iter(ep_iter_sorted);
std::advance(ep_iter, -(std::ptrdiff_t)new_edge_count);
edge_num edges_added_before_i
= new_edge_count; // Count increment to add to rowstarts
m_column.resize(m_column.size() + new_edge_count);
inherited_edge_properties::resize(
inherited_edge_properties::size() + new_edge_count);
BidirectionalIterator current_new_edge = first,
prev_new_edge = first;
EPIter current_new_edge_prop = ep_iter;
for (vertex_num i_plus_1 = m_rowstart.size() - 1; i_plus_1 > 0;
--i_plus_1)
{
vertex_num i = i_plus_1 - 1;
prev_new_edge = current_new_edge;
// edges_added_to_this_vertex = #mbrs of new_edges with first ==
// i
edge_num edges_added_to_this_vertex = 0;
while (current_new_edge != last)
{
if (get(global_to_local, current_new_edge->first) != i)
break;
++current_new_edge;
++current_new_edge_prop;
++edges_added_to_this_vertex;
}
edges_added_before_i -= edges_added_to_this_vertex;
// Invariant: edges_added_before_i = #mbrs of new_edges with
// first < i
edge_num old_rowstart = m_rowstart[i];
edge_num new_rowstart = m_rowstart[i] + edges_added_before_i;
edge_num old_degree = m_rowstart[i + 1] - m_rowstart[i];
edge_num new_degree = old_degree + edges_added_to_this_vertex;
// Move old edges forward (by #new_edges before this i) to make
// room new_rowstart > old_rowstart, so use copy_backwards
if (old_rowstart != new_rowstart)
{
std::copy_backward(m_column.begin() + old_rowstart,
m_column.begin() + old_rowstart + old_degree,
m_column.begin() + new_rowstart + old_degree);
inherited_edge_properties::move_range(
old_rowstart, old_rowstart + old_degree, new_rowstart);
}
// Add new edges (reversed because current_new_edge is a
// const_reverse_iterator)
BidirectionalIterator temp = current_new_edge;
EPIter temp_prop = current_new_edge_prop;
for (; temp != prev_new_edge; ++old_degree)
{
--temp;
--temp_prop;
m_column[new_rowstart + old_degree] = temp->second;
inherited_edge_properties::write_by_index(
new_rowstart + old_degree, *temp_prop);
}
m_rowstart[i + 1] = new_rowstart + new_degree;
if (edges_added_before_i == 0)
break; // No more edges inserted before this point
// m_rowstart[i] will be fixed up on the next iteration (to
// avoid changing the degree of vertex i - 1); the last
// iteration never changes it (either because of the condition
// of the break or because m_rowstart[0] is always 0)
}
}
};
template < typename Vertex, typename EdgeIndex > class csr_edge_descriptor
{
public:
Vertex src;
EdgeIndex idx;
csr_edge_descriptor(Vertex src, EdgeIndex idx) : src(src), idx(idx) {}
csr_edge_descriptor() : src(0), idx(0) {}
bool operator==(const csr_edge_descriptor& e) const
{
return idx == e.idx;
}
bool operator!=(const csr_edge_descriptor& e) const
{
return idx != e.idx;
}
bool operator<(const csr_edge_descriptor& e) const
{
return idx < e.idx;
}
bool operator>(const csr_edge_descriptor& e) const
{
return idx > e.idx;
}
bool operator<=(const csr_edge_descriptor& e) const
{
return idx <= e.idx;
}
bool operator>=(const csr_edge_descriptor& e) const
{
return idx >= e.idx;
}
template < typename Archiver >
void serialize(Archiver& ar, const unsigned int /*version*/)
{
ar& src& idx;
}
};
// Common out edge and edge iterators
template < typename CSRGraph >
class csr_out_edge_iterator
: public iterator_facade< csr_out_edge_iterator< CSRGraph >,
typename CSRGraph::edge_descriptor, std::random_access_iterator_tag,
const typename CSRGraph::edge_descriptor&,
typename int_t< CHAR_BIT
* sizeof(typename CSRGraph::edges_size_type) >::fast >
{
public:
typedef typename CSRGraph::edges_size_type EdgeIndex;
typedef typename CSRGraph::edge_descriptor edge_descriptor;
typedef typename int_t< CHAR_BIT * sizeof(EdgeIndex) >::fast
difference_type;
csr_out_edge_iterator() {}
// Implicit copy constructor OK
explicit csr_out_edge_iterator(edge_descriptor edge) : m_edge(edge) {}
public: // GCC 4.2.1 doesn't like the private-and-friend thing
// iterator_facade requirements
const edge_descriptor& dereference() const { return m_edge; }
bool equal(const csr_out_edge_iterator& other) const
{
return m_edge == other.m_edge;
}
void increment() { ++m_edge.idx; }
void decrement() { --m_edge.idx; }
void advance(difference_type n) { m_edge.idx += n; }
difference_type distance_to(const csr_out_edge_iterator& other) const
{
return other.m_edge.idx - m_edge.idx;
}
edge_descriptor m_edge;
friend class boost::iterator_core_access;
};
template < typename CSRGraph >
class csr_edge_iterator
: public iterator_facade< csr_edge_iterator< CSRGraph >,
typename CSRGraph::edge_descriptor, boost::forward_traversal_tag,
typename CSRGraph::edge_descriptor >
{
private:
typedef typename CSRGraph::edge_descriptor edge_descriptor;
typedef typename CSRGraph::edges_size_type EdgeIndex;
public:
csr_edge_iterator()
: rowstart_array(0)
, current_edge()
, end_of_this_vertex(0)
, total_num_edges(0)
{
}
csr_edge_iterator(const CSRGraph& graph, edge_descriptor current_edge,
EdgeIndex end_of_this_vertex)
: rowstart_array(&graph.m_forward.m_rowstart[0])
, current_edge(current_edge)
, end_of_this_vertex(end_of_this_vertex)
, total_num_edges(num_edges(graph))
{
}
public: // See above
friend class boost::iterator_core_access;
edge_descriptor dereference() const { return current_edge; }
bool equal(const csr_edge_iterator& o) const
{
return current_edge == o.current_edge;
}
void increment()
{
++current_edge.idx;
if (current_edge.idx == total_num_edges)
return;
while (current_edge.idx == end_of_this_vertex)
{
++current_edge.src;
end_of_this_vertex = rowstart_array[current_edge.src + 1];
}
}
const EdgeIndex* rowstart_array;
edge_descriptor current_edge;
EdgeIndex end_of_this_vertex;
EdgeIndex total_num_edges;
};
// Only for bidirectional graphs
template < typename CSRGraph >
class csr_in_edge_iterator
: public iterator_facade< csr_in_edge_iterator< CSRGraph >,
typename CSRGraph::edge_descriptor, boost::forward_traversal_tag,
typename CSRGraph::edge_descriptor >
{
public:
typedef typename CSRGraph::edges_size_type EdgeIndex;
typedef typename CSRGraph::edge_descriptor edge_descriptor;
csr_in_edge_iterator() : m_graph(0) {}
// Implicit copy constructor OK
csr_in_edge_iterator(
const CSRGraph& graph, EdgeIndex index_in_backward_graph)
: m_index_in_backward_graph(index_in_backward_graph), m_graph(&graph)
{
}
public: // See above
// iterator_facade requirements
edge_descriptor dereference() const
{
return edge_descriptor(
m_graph->m_backward.m_column[m_index_in_backward_graph],
m_graph->m_backward
.m_edge_properties[m_index_in_backward_graph]);
}
bool equal(const csr_in_edge_iterator& other) const
{
return m_index_in_backward_graph == other.m_index_in_backward_graph;
}
void increment() { ++m_index_in_backward_graph; }
void decrement() { --m_index_in_backward_graph; }
void advance(std::ptrdiff_t n) { m_index_in_backward_graph += n; }
std::ptrdiff_t distance_to(const csr_in_edge_iterator& other) const
{
return other.m_index_in_backward_graph - m_index_in_backward_graph;
}
EdgeIndex m_index_in_backward_graph;
const CSRGraph* m_graph;
friend class boost::iterator_core_access;
};
template < typename A, typename B > struct transpose_pair
{
typedef std::pair< B, A > result_type;
result_type operator()(const std::pair< A, B >& p) const
{
return result_type(p.second, p.first);
}
};
template < typename Iter > struct transpose_iterator_gen
{
typedef typename std::iterator_traits< Iter >::value_type vt;
typedef typename vt::first_type first_type;
typedef typename vt::second_type second_type;
typedef transpose_pair< first_type, second_type > transpose;
typedef boost::transform_iterator< transpose, Iter > type;
static type make(Iter it) { return type(it, transpose()); }
};
template < typename Iter >
typename transpose_iterator_gen< Iter >::type transpose_edges(Iter i)
{
return transpose_iterator_gen< Iter >::make(i);
}
template < typename GraphT, typename VertexIndexMap >
class edge_to_index_pair
{
typedef typename boost::graph_traits< GraphT >::vertices_size_type
vertices_size_type;
typedef typename boost::graph_traits< GraphT >::edge_descriptor
edge_descriptor;
public:
typedef std::pair< vertices_size_type, vertices_size_type > result_type;
edge_to_index_pair() : g(0), index() {}
edge_to_index_pair(const GraphT& g, const VertexIndexMap& index)
: g(&g), index(index)
{
}
result_type operator()(edge_descriptor e) const
{
return result_type(
get(index, source(e, *g)), get(index, target(e, *g)));
}
private:
const GraphT* g;
VertexIndexMap index;
};
template < typename GraphT, typename VertexIndexMap >
edge_to_index_pair< GraphT, VertexIndexMap > make_edge_to_index_pair(
const GraphT& g, const VertexIndexMap& index)
{
return edge_to_index_pair< GraphT, VertexIndexMap >(g, index);
}
template < typename GraphT >
edge_to_index_pair< GraphT,
typename boost::property_map< GraphT,
boost::vertex_index_t >::const_type >
make_edge_to_index_pair(const GraphT& g)
{
typedef typename boost::property_map< GraphT,
boost::vertex_index_t >::const_type VertexIndexMap;
return edge_to_index_pair< GraphT, VertexIndexMap >(
g, get(boost::vertex_index, g));
}
template < typename GraphT, typename VertexIndexMap, typename Iter >
boost::transform_iterator< edge_to_index_pair< GraphT, VertexIndexMap >,
Iter >
make_edge_to_index_pair_iter(
const GraphT& g, const VertexIndexMap& index, Iter it)
{
return boost::transform_iterator<
edge_to_index_pair< GraphT, VertexIndexMap >, Iter >(
it, edge_to_index_pair< GraphT, VertexIndexMap >(g, index));
}
} // namespace detail
template < typename Vertex, typename EdgeIndex >
struct hash< detail::csr_edge_descriptor< Vertex, EdgeIndex > >
{
std::size_t operator()(
detail::csr_edge_descriptor< Vertex, EdgeIndex > const& x) const
{
std::size_t hash = hash_value(x.src);
hash_combine(hash, x.idx);
return hash;
}
};
} // namespace boost
#endif // BOOST_GRAPH_COMPRESSED_SPARSE_ROW_STRUCT_HPP