mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-21 04:11:50 +03:00
114 lines
3.5 KiB
C++
114 lines
3.5 KiB
C++
// Copyright 2004 The Trustees of Indiana University.
|
|
|
|
// 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)
|
|
|
|
// Authors: Douglas Gregor
|
|
// Andrew Lumsdaine
|
|
|
|
#ifndef BOOST_GRAPH_PARALLEL_PROPERTIES_HPP
|
|
#define BOOST_GRAPH_PARALLEL_PROPERTIES_HPP
|
|
|
|
#ifndef BOOST_GRAPH_USE_MPI
|
|
#error "Parallel BGL files should not be included unless <boost/graph/use_mpi.hpp> has been included"
|
|
#endif
|
|
|
|
#include <boost/graph/properties.hpp>
|
|
#include <boost/property_map/parallel/distributed_property_map.hpp>
|
|
|
|
namespace boost {
|
|
/***************************************************************************
|
|
* Property map reduction operations
|
|
***************************************************************************/
|
|
/**
|
|
* Metafunction that produces a reduction operation for the given
|
|
* property. The default behavior merely forwards to @ref
|
|
* basic_reduce, but it is expected that this class template will be
|
|
* specified for important properties.
|
|
*/
|
|
template<typename Property>
|
|
struct property_reduce
|
|
{
|
|
template<typename Value>
|
|
class apply : public parallel::basic_reduce<Value> {};
|
|
};
|
|
|
|
/**
|
|
* Reduction of vertex colors can only darken, not lighten, the
|
|
* color. Black cannot turn black, grey can only turn black, and
|
|
* white can be changed to either color. The default color is white.
|
|
*/
|
|
template<>
|
|
struct property_reduce<vertex_color_t>
|
|
{
|
|
template<typename Color>
|
|
class apply
|
|
{
|
|
typedef color_traits<Color> traits;
|
|
|
|
public:
|
|
BOOST_STATIC_CONSTANT(bool, non_default_resolver = true);
|
|
|
|
template<typename Key>
|
|
Color operator()(const Key&) const { return traits::white(); }
|
|
|
|
template<typename Key>
|
|
Color operator()(const Key&, Color local, Color remote) const {
|
|
if (local == traits::white()) return remote;
|
|
else if (remote == traits::black()) return remote;
|
|
else return local;
|
|
}
|
|
};
|
|
};
|
|
|
|
/**
|
|
* Reduction of a distance always takes the shorter distance. The
|
|
* default distance value is the maximum value for the data type.
|
|
*/
|
|
template<>
|
|
struct property_reduce<vertex_distance_t>
|
|
{
|
|
template<typename T>
|
|
class apply
|
|
{
|
|
public:
|
|
BOOST_STATIC_CONSTANT(bool, non_default_resolver = true);
|
|
|
|
template<typename Key>
|
|
T operator()(const Key&) const { return (std::numeric_limits<T>::max)(); }
|
|
|
|
template<typename Key>
|
|
T operator()(const Key&, T x, T y) const { return x < y? x : y; }
|
|
};
|
|
};
|
|
|
|
template<>
|
|
struct property_reduce<vertex_predecessor_t>
|
|
{
|
|
template<typename T>
|
|
class apply
|
|
{
|
|
public:
|
|
BOOST_STATIC_CONSTANT(bool, non_default_resolver = true);
|
|
|
|
template<typename Key>
|
|
T operator()(Key key) const { return key; }
|
|
template<typename Key>
|
|
T operator()(Key key, T, T y) const { return y; }
|
|
};
|
|
};
|
|
|
|
template<typename Property, typename PropertyMap>
|
|
inline void set_property_map_role(Property p, PropertyMap pm)
|
|
{
|
|
typedef typename property_traits<PropertyMap>::value_type value_type;
|
|
typedef property_reduce<Property> property_red;
|
|
typedef typename property_red::template apply<value_type> reduce;
|
|
|
|
pm.set_reduce(reduce());
|
|
}
|
|
|
|
} // end namespace boost
|
|
#endif // BOOST_GRAPH_PARALLEL_PROPERTIES_HPP
|