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64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
// Copyright (C) 2005-2006 Alain Miniussi <alain.miniussi -at- oca.eu>.
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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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// Message Passing Interface 1.1 -- Section 4. MPI Collectives
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/** @file inplace.hpp
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*
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* This header provides helpers to indicate to MPI collective operation
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* that a buffer can be use both as an input and output.
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*/
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#ifndef BOOST_MPI_INPLACE_HPP
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#define BOOST_MPI_INPLACE_HPP
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#include <boost/mpi/communicator.hpp>
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#include <vector>
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namespace boost { namespace mpi {
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/**
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* @brief Wrapper type to explicitly indicate that a input data
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* can be overriden with an output value.
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*/
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template <typename T>
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struct inplace_t {
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inplace_t(T& inout) : buffer(inout) {}
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T& buffer;
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};
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template <typename T>
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struct inplace_t<T*> {
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inplace_t(T* inout) : buffer(inout) {}
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T* buffer;
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};
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/**
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* @brief Wrapp a input data to indicate that it can be overriden
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* with an ouput value.
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* @param inout the contributing input value, it will be overriden
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* with the output value where one is expected. If it is a pointer,
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* the number of elements will be provided separatly.
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* @returns The wrapped value or pointer.
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*/
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template<typename T>
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inplace_t<T>
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inplace(T& inout) {
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return inplace_t<T>(inout);
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}
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/**
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* \overload
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*/
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template<typename T>
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inplace_t<T*>
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inplace(T* inout) {
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return inplace_t<T*>(inout);
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}
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} } // end namespace boost::mpi
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#endif // BOOST_MPI_INPLACE_HPP
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