115 lines
2.8 KiB
C++
115 lines
2.8 KiB
C++
// Copyright Daniel Wallin 2007. Use, modification and distribution is
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// subject to the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_SHUFFLED_DISTRIBUTION_070923_HPP
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#define BOOST_SHUFFLED_DISTRIBUTION_070923_HPP
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#ifndef BOOST_GRAPH_USE_MPI
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#error "Parallel BGL files should not be included unless <boost/graph/use_mpi.hpp> has been included"
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#endif
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# include <boost/assert.hpp>
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# include <boost/iterator/counting_iterator.hpp>
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# include <vector>
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namespace boost { namespace graph { namespace distributed {
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template <class BaseDistribution>
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struct shuffled_distribution : BaseDistribution
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{
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typedef std::size_t size_type;
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template <class ProcessGroup>
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shuffled_distribution(ProcessGroup const& pg, BaseDistribution const& base)
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: BaseDistribution(base)
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, n(num_processes(pg))
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, mapping_(make_counting_iterator(size_type(0)), make_counting_iterator(n))
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, reverse_mapping(mapping_)
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{}
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std::vector<size_type> const& mapping() const
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{
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return mapping_;
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}
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template <class InputIterator>
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void assign_mapping(InputIterator first, InputIterator last)
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{
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mapping_.assign(first, last);
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BOOST_ASSERT(mapping_.size() == n);
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reverse_mapping.resize(mapping_.size());
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for (std::vector<size_t>::iterator i(mapping_.begin());
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i != mapping_.end(); ++i)
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{
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reverse_mapping[*i] = i - mapping_.begin();
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}
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}
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BaseDistribution& base()
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{
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return *this;
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}
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BaseDistribution const& base() const
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{
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return *this;
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}
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template <class ProcessID>
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size_type block_size(ProcessID id, size_type n) const
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{
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return base().block_size(reverse_mapping[id], n);
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}
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template <class T>
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size_type operator()(T const& value) const
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{
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return mapping_[base()(value)];
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}
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template <class ProcessID>
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size_type start(ProcessID id) const
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{
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return base().start(reverse_mapping[id]);
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}
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size_type local(size_type i) const
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{
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return base().local(i);
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}
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size_type global(size_type i) const
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{
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return base().global(i);
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}
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template <class ProcessID>
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size_type global(ProcessID id, size_type n) const
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{
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return base().global(reverse_mapping[id], n);
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}
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template <class Archive>
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void serialize(Archive& ar, unsigned long /*version*/)
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{
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ar & serialization::make_nvp("base", base());
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}
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void clear()
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{
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base().clear();
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}
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private:
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size_type n;
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std::vector<size_type> mapping_;
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std::vector<size_type> reverse_mapping;
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};
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}}} // namespace boost::graph::distributed
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#endif // BOOST_SHUFFLED_DISTRIBUTION_070923_HPP
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