Reference documentation for deal.II version 9.4.0
\(\newcommand{\dealvcentcolon}{\mathrel{\mathop{:}}}\) \(\newcommand{\dealcoloneq}{\dealvcentcolon\mathrel{\mkern-1.2mu}=}\) \(\newcommand{\jump}[1]{\left[\!\left[ #1 \right]\!\right]}\) \(\newcommand{\average}[1]{\left\{\!\left\{ #1 \right\}\!\right\}}\)
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
27namespace 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_OPEN
Definition: config.h:442
#define DEAL_II_NAMESPACE_CLOSE
Definition: config.h:443
Definition: c++.h:141