1 // Copyright (C) 2005-2006 Alain Miniussi <alain.miniussi -at- oca.eu>. 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 // Message Passing Interface 1.1 -- Section 4. MPI Collectives 8 9 /** @file inplace.hpp 10 * 11 * This header provides helpers to indicate to MPI collective operation 12 * that a buffer can be use both as an input and output. 13 */ 14 #ifndef BOOST_MPI_INPLACE_HPP 15 #define BOOST_MPI_INPLACE_HPP 16 17 #include <boost/mpi/communicator.hpp> 18 #include <vector> 19 20 namespace boost { namespace mpi { 21 22 /** 23 * @brief Wrapper type to explicitly indicate that a input data 24 * can be overriden with an output value. 25 */ 26 template <typename T> 27 struct inplace_t { inplace_tboost::mpi::inplace_t28 inplace_t(T& inout) : buffer(inout) {} 29 T& buffer; 30 }; 31 32 template <typename T> 33 struct inplace_t<T*> { inplace_tboost::mpi::inplace_t34 inplace_t(T* inout) : buffer(inout) {} 35 T* buffer; 36 }; 37 38 39 /** 40 * @brief Wrapp a input data to indicate that it can be overriden 41 * with an ouput value. 42 * @param inout the contributing input value, it will be overriden 43 * with the output value where one is expected. If it is a pointer, 44 * the number of elements will be provided separatly. 45 * @returns The wrapped value or pointer. 46 */ 47 template<typename T> 48 inplace_t<T> inplace(T & inout)49inplace(T& inout) { 50 return inplace_t<T>(inout); 51 } 52 /** 53 * \overload 54 */ 55 template<typename T> 56 inplace_t<T*> inplace(T * inout)57inplace(T* inout) { 58 return inplace_t<T*>(inout); 59 } 60 } } // end namespace boost::mpi 61 62 #endif // BOOST_MPI_INPLACE_HPP 63 64