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// 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
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