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1 | // Copyright 2005 The Trustees of Indiana University. |
2 | ||
3 | // Use, modification and distribution is subject to the Boost Software | |
4 | // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at | |
5 | // http://www.boost.org/LICENSE_1_0.txt) | |
6 | ||
7 | // Authors: Douglas Gregor | |
8 | // Andrew Lumsdaine | |
9 | ||
10 | #ifndef BOOST_PARALLEL_BASIC_REDUCE_HPP | |
11 | #define BOOST_PARALLEL_BASIC_REDUCE_HPP | |
12 | ||
13 | namespace boost { namespace parallel { | |
14 | ||
15 | /** Reduction operation used to reconcile differences between local | |
16 | * and remote values for a particular key in a property map. The | |
17 | * type @c T is typically the @c value_type of the property | |
18 | * map. This basic reduction returns a default-constructed @c T as | |
19 | * the default value and always resolves to the remote value. | |
20 | */ | |
21 | template<typename T> | |
22 | struct basic_reduce | |
23 | { | |
24 | BOOST_STATIC_CONSTANT(bool, non_default_resolver = false); | |
25 | ||
26 | /// Returns a default-constructed T object | |
27 | template<typename Key> | |
28 | T operator()(const Key&) const { return T(); } | |
29 | ||
30 | /// Returns the remote value | |
31 | template<typename Key> | |
32 | const T& operator()(const Key&, const T&, const T& remote) const | |
33 | { return remote; } | |
34 | }; | |
35 | ||
36 | } } // end namespace boost::parallel | |
37 | ||
38 | #endif // BOOST_PARALLEL_BASIC_REDUCE_HPP |