openPMD-api
Mpi.hpp
1 /* Copyright 2022 Franz Poeschel
2  *
3  * This file is part of openPMD-api.
4  *
5  * openPMD-api is free software: you can redistribute it and/or modify
6  * it under the terms of of either the GNU General Public License or
7  * the GNU Lesser General Public License as published by
8  * the Free Software Foundation, either version 3 of the License, or
9  * (at your option) any later version.
10  *
11  * openPMD-api is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License and the GNU Lesser General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * and the GNU Lesser General Public License along with openPMD-api.
19  * If not, see <http://www.gnu.org/licenses/>.
20  */
21 #pragma once
22 
23 #include "openPMD/config.hpp"
24 
25 #include "openPMD/auxiliary/TypeTraits.hpp"
26 
27 #if openPMD_HAVE_MPI
28 #include <mpi.h>
29 #endif
30 
31 #include <type_traits>
32 
33 namespace openPMD::auxiliary
34 {
35 #if openPMD_HAVE_MPI
36 
37 namespace
38 {
39  template <typename T>
40  constexpr MPI_Datatype openPMD_MPI_type()
41  {
42  using T_decay = std::decay_t<T>;
43  if constexpr (std::is_same_v<T_decay, char>)
44  {
45  return MPI_CHAR;
46  }
47  else if constexpr (std::is_same_v<T_decay, unsigned>)
48  {
49  return MPI_UNSIGNED;
50  }
51  else if constexpr (std::is_same_v<T_decay, unsigned long>)
52  {
53  return MPI_UNSIGNED_LONG;
54  }
55  else if constexpr (std::is_same_v<T_decay, unsigned long long>)
56  {
57  return MPI_UNSIGNED_LONG_LONG;
58  }
59  else
60  {
61  static_assert(
62  dependent_false_v<T>, "openPMD_MPI_type: Unsupported type.");
63  }
64  }
65 } // namespace
66 
67 #endif
68 } // namespace openPMD::auxiliary
Definition: Date.cpp:28