// Copyright Daniel Wallin 2007. 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)
|
|
#ifndef BOOST_SHUFFLED_DISTRIBUTION_070923_HPP
|
#define BOOST_SHUFFLED_DISTRIBUTION_070923_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/assert.hpp>
|
# include <boost/iterator/counting_iterator.hpp>
|
# include <vector>
|
|
namespace boost { namespace graph { namespace distributed {
|
|
template <class BaseDistribution>
|
struct shuffled_distribution : BaseDistribution
|
{
|
typedef std::size_t size_type;
|
|
template <class ProcessGroup>
|
shuffled_distribution(ProcessGroup const& pg, BaseDistribution const& base)
|
: BaseDistribution(base)
|
, n(num_processes(pg))
|
, mapping_(make_counting_iterator(size_type(0)), make_counting_iterator(n))
|
, reverse_mapping(mapping_)
|
{}
|
|
std::vector<size_type> const& mapping() const
|
{
|
return mapping_;
|
}
|
|
template <class InputIterator>
|
void assign_mapping(InputIterator first, InputIterator last)
|
{
|
mapping_.assign(first, last);
|
BOOST_ASSERT(mapping_.size() == n);
|
reverse_mapping.resize(mapping_.size());
|
|
for (std::vector<size_t>::iterator i(mapping_.begin());
|
i != mapping_.end(); ++i)
|
{
|
reverse_mapping[*i] = i - mapping_.begin();
|
}
|
}
|
|
BaseDistribution& base()
|
{
|
return *this;
|
}
|
|
BaseDistribution const& base() const
|
{
|
return *this;
|
}
|
|
template <class ProcessID>
|
size_type block_size(ProcessID id, size_type n) const
|
{
|
return base().block_size(reverse_mapping[id], n);
|
}
|
|
template <class T>
|
size_type operator()(T const& value) const
|
{
|
return mapping_[base()(value)];
|
}
|
|
template <class ProcessID>
|
size_type start(ProcessID id) const
|
{
|
return base().start(reverse_mapping[id]);
|
}
|
|
size_type local(size_type i) const
|
{
|
return base().local(i);
|
}
|
|
size_type global(size_type i) const
|
{
|
return base().global(i);
|
}
|
|
template <class ProcessID>
|
size_type global(ProcessID id, size_type n) const
|
{
|
return base().global(reverse_mapping[id], n);
|
}
|
|
template <class Archive>
|
void serialize(Archive& ar, unsigned long /*version*/)
|
{
|
ar & serialization::make_nvp("base", base());
|
}
|
|
void clear()
|
{
|
base().clear();
|
}
|
|
private:
|
size_type n;
|
std::vector<size_type> mapping_;
|
std::vector<size_type> reverse_mapping;
|
};
|
|
}}} // namespace boost::graph::distributed
|
|
#endif // BOOST_SHUFFLED_DISTRIBUTION_070923_HPP
|
