89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
///@file
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/// Metaprogramming Integer sequence (Is in C++14 but not C++11)
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//
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// Copyright (C) 2017 Thomas Geymayer <tomgey@gmail.com>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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#ifndef SIMGEAR_STD_INTEGER_SEQUENCE_HXX_
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#define SIMGEAR_STD_INTEGER_SEQUENCE_HXX_
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#include <simgear/simgear_config.h>
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#include "type_traits.hxx"
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#include <utility>
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#ifndef HAVE_STD_INDEX_SEQUENCE
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# include <cstddef>
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namespace std
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{
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template<class T, T... Ints>
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struct integer_sequence
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{
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static_assert(
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std::is_integral<T>::value,
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"std::integer_sequence can only be instantiated with an an integral type"
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);
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typedef T value_type;
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static constexpr size_t size() noexcept { return sizeof...(Ints); }
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};
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}
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namespace simgear { namespace detail
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{
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template<class T, class Seq, T El>
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struct append;
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template<class T, T... Ints, T Int>
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struct append<T, std::integer_sequence<T, Ints...>, Int>
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{
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using type = std::integer_sequence<T, Ints..., Int>;
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};
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template<class T, std::size_t N>
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struct sequence_gen
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{
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using type =
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typename append<T, typename sequence_gen<T, N - 1>::type, N - 1>::type;
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};
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template<class T>
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struct sequence_gen<T, 0>
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{
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using type = std::integer_sequence<T>;
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};
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}}
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namespace std
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{
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template<size_t... Ints>
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using index_sequence = integer_sequence<size_t, Ints...>;
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template<class T, size_t N>
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using make_integer_sequence =
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typename simgear::detail::sequence_gen<T, N>::type;
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template<size_t N>
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using make_index_sequence = make_integer_sequence<size_t, N>;
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template<class... T>
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using index_sequence_for = make_index_sequence<sizeof...(T)>;
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}
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#endif
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#endif /* SIMGEAR_STD_INTEGER_SEQUENCE_HXX_ */
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