boost/property_map/parallel/basic_reduce.hpp
// Copyright 2005 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_PARALLEL_BASIC_REDUCE_HPP #define BOOST_PARALLEL_BASIC_REDUCE_HPP namespace boost { namespace parallel { /** Reduction operation used to reconcile differences between local * and remote values for a particular key in a property map. The * type @c T is typically the @c value_type of the property * map. This basic reduction returns a default-constructed @c T as * the default value and always resolves to the remote value. */ template<typename T> struct basic_reduce { BOOST_STATIC_CONSTANT(bool, non_default_resolver = false); /// Returns a default-constructed T object template<typename Key> T operator()(const Key&) const { return T(); } /// Returns the remote value template<typename Key> const T& operator()(const Key&, const T&, const T& remote) const { return remote; } }; } } // end namespace boost::parallel #endif // BOOST_PARALLEL_BASIC_REDUCE_HPP