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// 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
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