openPMD-api
Environment.hpp
1 /* Copyright 2018-2021 Franz Poeschel, Axel Huebl
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 
22 #pragma once
23 
24 #include <cstdlib>
25 #include <cstring>
26 #include <iostream>
27 #include <stdexcept>
28 #include <string>
29 
30 namespace openPMD
31 {
32 namespace auxiliary
33 {
34  inline std::string
35  getEnvString(std::string const &key, std::string const defaultValue)
36  {
37  char const *env = std::getenv(key.c_str());
38  if (env != nullptr)
39  return std::string{env};
40  else
41  return defaultValue;
42  }
43 
44  inline int getEnvNum(std::string const &key, int defaultValue)
45  {
46  char const *env = std::getenv(key.c_str());
47  if (env != nullptr)
48  {
49  std::string env_string{env};
50  try
51  {
52  return std::stoi(env_string);
53  }
54  catch (std::invalid_argument const &)
55  {
56  return defaultValue;
57  }
58  }
59  else
60  return defaultValue;
61  }
62 } // namespace auxiliary
63 } // namespace openPMD
Public definitions of openPMD-api.