mpiconversion.h

/*
 * This file is part of Vlasiator.
 * Copyright 2010-2016 Finnish Meteorological Institute
 *
 * For details of usage, see the COPYING file and read the "Rules of the Road"
 * at http://www.physics.helsinki.fi/vlasiator/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef MPI_CONVERSION_H
#define MPI_CONVERSION_H
#include <mpi.h>
#include <cstdlib>
#include <iostream>
#include <stdint.h>

// Overloaded templates which return the corresponding data type
// for C++ native data types. For example, if float has been 
// typedef'd as Real, then MPI_Type<Real>() should return MPI_FLOAT.
// If you later on change the typedef to double, MPI_Type<Real>() 
// still works.
template<typename T> inline MPI_Datatype MPI_Type() {
   std::cerr << "(mpiconversion.h): NULL datatype returned, byte size of original is " << sizeof(T) << std::endl;
   exit(1);
   return 0;
}

template<> inline MPI_Datatype MPI_Type<char>() {return MPI_CHAR;}

// Signed integer types
template<> inline MPI_Datatype MPI_Type<signed char>() {return MPI_CHAR;}
template<> inline MPI_Datatype MPI_Type<short>() {return MPI_SHORT;}
template<> inline MPI_Datatype MPI_Type<int>() {return MPI_INT;}
template<> inline MPI_Datatype MPI_Type<long int>() {return MPI_LONG;}
template<> inline MPI_Datatype MPI_Type<long long int>() {return MPI_LONG_LONG;}

// Unsigned integer types
template<> inline MPI_Datatype MPI_Type<unsigned char>() {return MPI_UNSIGNED_CHAR;}
template<> inline MPI_Datatype MPI_Type<unsigned short>() {return MPI_UNSIGNED_SHORT;}
template<> inline MPI_Datatype MPI_Type<unsigned int>() {return MPI_UNSIGNED;}
template<> inline MPI_Datatype MPI_Type<unsigned long int>() {return MPI_UNSIGNED_LONG;}
template<> inline MPI_Datatype MPI_Type<unsigned long long int>() {return MPI_UNSIGNED_LONG_LONG;}

// Floating point types
template<> inline MPI_Datatype MPI_Type<float>() {return MPI_FLOAT;}
template<> inline MPI_Datatype MPI_Type<double>() {return MPI_DOUBLE;}
template<> inline MPI_Datatype MPI_Type<long double>() {return MPI_LONG_DOUBLE;}

#endif