mpi-extra.h

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// n2p2 - A neural network potential package
// Copyright (C) 2018 Andreas Singraber (University of Vienna)
//
// 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 3 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, see <https://www.gnu.org/licenses/>.
 
#include <mpi.h>
#include <cstdint>
#include <climits>
 
#if SIZE_MAX == UCHAR_MAX
   #define MPI_SIZE_T MPI_UNSIGNED_CHAR
#elif SIZE_MAX == USHRT_MAX
   #define MPI_SIZE_T MPI_UNSIGNED_SHORT
#elif SIZE_MAX == UINT_MAX
   #define MPI_SIZE_T MPI_UNSIGNED
#elif SIZE_MAX == ULONG_MAX
   #define MPI_SIZE_T MPI_UNSIGNED_LONG
#elif SIZE_MAX == ULLONG_MAX
   #define MPI_SIZE_T MPI_UNSIGNED_LONG_LONG
#else
   #error "No matching MPI data type for size_t."
#endif