2 * This file is part of the GROMACS molecular simulation package.
4 * Copyright (c) 2018,2019,2020,2021, by the GROMACS development team, led by
5 * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
6 * and including many others, as listed in the AUTHORS file in the
7 * top-level source directory and at http://www.gromacs.org.
9 * GROMACS is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public License
11 * as published by the Free Software Foundation; either version 2.1
12 * of the License, or (at your option) any later version.
14 * GROMACS is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with GROMACS; if not, see
21 * http://www.gnu.org/licenses, or write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 * If you want to redistribute modifications to GROMACS, please
25 * consider that scientific software is very special. Version
26 * control is crucial - bugs must be traceable. We will be happy to
27 * consider code for inclusion in the official distribution, but
28 * derived work must not be called official GROMACS. Details are found
29 * in the README & COPYING files - if they are missing, get the
30 * official version at http://www.gromacs.org.
32 * To help us fund GROMACS development, we humbly ask that you cite
33 * the research papers on the package. Check out http://www.gromacs.org.
36 /*! \libinternal \file
37 * \brief Provides ported functions/classes from boost::mp11
39 * Adapted from the Boost Library 1.67
41 * \author Roland Schulz <roland.schulz@intel.com>
42 * \ingroup module_compat
45 #ifndef GMX_COMPAT_MP11_H
46 #define GMX_COMPAT_MP11_H
50 #include "gromacs/utility/exceptions.h"
57 /** \internal \brief Simplified analogue of boost::mp11::mp_with_index, compatible only with C++17 and up.
59 * \c mp_with_index<N>(i, f) calls \p f with \c mp_size_t<i>() and returns the result.
60 * \p i must be less than \p N.
64 constexpr int foo_max = 3;
65 template<int i, typename = std::enable_if_t<(i < foo_max)>>
70 return mp_with_index<foo_max>(i, [](auto i) {
76 template<std::size_t N, class F, typename std::enable_if<(N <= 1)>::type* = nullptr>
77 static auto mp_with_index(std::size_t i, F&& f)
79 // Last step of recursion. Must have one active "return" for proper type deduction.
82 return std::forward<F>(f)(std::integral_constant<std::size_t, N - 1>());
86 const std::string errorMessage =
87 "Invalid arguments of mp_with_index (i=" + std::to_string(i) + ")";
88 GMX_THROW(InternalError(errorMessage));
92 // Doxygen does not like recursive templates.
94 template<std::size_t N, class F, typename std::enable_if<(N > 1)>::type* = nullptr>
95 static auto mp_with_index(std::size_t i, F&& f)
99 return std::forward<F>(f)(std::integral_constant<std::size_t, N - 1>());
103 return mp_with_index<N - 1>(i, std::forward<F>(f));
108 } // namespace compat