Reference documentation for deal.II version Git e67cfc96e3 2021-10-16 16:07:33 +0200
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optional.h
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1 // ---------------------------------------------------------------------
2 //
3 // Copyright (C) 2019 - 2020 by the deal.II authors
4 //
5 // This file is part of the deal.II library.
6 //
7 // The deal.II library is free software; you can use it, redistribute
8 // it, and/or modify it under the terms of the GNU Lesser General
9 // Public License as published by the Free Software Foundation; either
10 // version 2.1 of the License, or (at your option) any later version.
11 // The full text of the license can be found in the file LICENSE.md at
12 // the top level directory of deal.II.
13 //
14 // ---------------------------------------------------------------------
15 #ifndef dealii_cxx17_optional_h
16 #define dealii_cxx17_optional_h
17 
18 #include <deal.II/base/config.h>
19 
20 #ifdef DEAL_II_HAVE_CXX17
21 # include <optional>
22 #else
23 # include <boost/optional.hpp>
24 #endif
25 
27 namespace std_cxx17
28 {
29 #ifndef DEAL_II_HAVE_CXX17
30  using boost::optional;
31 #else
32  using std::optional;
33 #endif
34 } // namespace std_cxx17
36 
37 #endif // dealii_cxx17_optional_h
#define DEAL_II_NAMESPACE_CLOSE
Definition: config.h:401
#define DEAL_II_NAMESPACE_OPEN
Definition: config.h:400
Definition: c++.h:153