Chris@102: // Copyright 2005 The Trustees of Indiana University.
Chris@102: 
Chris@102: // Use, modification and distribution is subject to the Boost Software
Chris@102: // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@102: // http://www.boost.org/LICENSE_1_0.txt)
Chris@102: 
Chris@102: //  Authors: Douglas Gregor
Chris@102: //           Andrew Lumsdaine
Chris@102: 
Chris@102: #ifndef BOOST_PARALLEL_BASIC_REDUCE_HPP
Chris@102: #define BOOST_PARALLEL_BASIC_REDUCE_HPP
Chris@102: 
Chris@102: namespace boost { namespace parallel {
Chris@102: 
Chris@102: /** Reduction operation used to reconcile differences between local
Chris@102:  * and remote values for a particular key in a property map.  The
Chris@102:  * type @c T is typically the @c value_type of the property
Chris@102:  * map. This basic reduction returns a default-constructed @c T as
Chris@102:  * the default value and always resolves to the remote value.
Chris@102:  */
Chris@102: template<typename T>
Chris@102: struct basic_reduce
Chris@102: {
Chris@102:   BOOST_STATIC_CONSTANT(bool, non_default_resolver = false);
Chris@102: 
Chris@102:   /// Returns a default-constructed T object
Chris@102:   template<typename Key>
Chris@102:   T operator()(const Key&) const { return T(); }
Chris@102:   
Chris@102:   /// Returns the remote value
Chris@102:   template<typename Key>
Chris@102:   const T& operator()(const Key&, const T&, const T& remote) const 
Chris@102:   { return remote; }
Chris@102: };
Chris@102: 
Chris@102: } } // end namespace boost::parallel
Chris@102: 
Chris@102: #endif // BOOST_PARALLEL_BASIC_REDUCE_HPP