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42 lines
1.3 KiB
42 lines
1.3 KiB
// Copyright 2005 The Trustees of Indiana University. |
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// Use, modification and distribution is subject to the Boost Software |
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// Authors: Douglas Gregor |
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// Andrew Lumsdaine |
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#ifndef BOOST_PARALLEL_BASIC_REDUCE_HPP |
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#define BOOST_PARALLEL_BASIC_REDUCE_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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namespace boost { namespace parallel { |
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/** Reduction operation used to reconcile differences between local |
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* and remote values for a particular key in a property map. The |
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* type @c T is typically the @c value_type of the property |
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* map. This basic reduction returns a default-constructed @c T as |
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* the default value and always resolves to the remote value. |
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*/ |
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template<typename T> |
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struct basic_reduce |
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{ |
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BOOST_STATIC_CONSTANT(bool, non_default_resolver = false); |
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/// Returns a default-constructed T object |
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template<typename Key> |
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T operator()(const Key&) const { return T(); } |
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/// Returns the remote value |
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template<typename Key> |
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const T& operator()(const Key&, const T&, const T& remote) const |
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{ return remote; } |
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}; |
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} } // end namespace boost::parallel |
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#endif // BOOST_PARALLEL_BASIC_REDUCE_HPP
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