599 lines
18 KiB
C++
599 lines
18 KiB
C++
// Core algorithmic facilities -*- C++ -*-
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// Copyright (C) 2020-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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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
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/ranges_algobase.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{algorithm}
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*/
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#ifndef _RANGES_ALGOBASE_H
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#define _RANGES_ALGOBASE_H 1
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#if __cplusplus > 201703L
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#include <compare>
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#include <iterator>
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#include <bits/ranges_base.h> // ranges::begin, ranges::range etc.
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#include <bits/invoke.h> // __invoke
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#include <bits/cpp_type_traits.h> // __is_byte
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#if __cpp_lib_concepts
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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namespace ranges
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{
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namespace __detail
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{
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template<typename _Tp>
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constexpr inline bool __is_normal_iterator = false;
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template<typename _Iterator, typename _Container>
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constexpr inline bool
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__is_normal_iterator<__gnu_cxx::__normal_iterator<_Iterator,
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_Container>> = true;
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template<typename _Tp>
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constexpr inline bool __is_reverse_iterator = false;
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template<typename _Iterator>
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constexpr inline bool
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__is_reverse_iterator<reverse_iterator<_Iterator>> = true;
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template<typename _Tp>
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constexpr inline bool __is_move_iterator = false;
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template<typename _Iterator>
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constexpr inline bool
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__is_move_iterator<move_iterator<_Iterator>> = true;
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} // namespace __detail
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struct __equal_fn
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{
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template<input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
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input_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
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typename _Pred = ranges::equal_to,
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typename _Proj1 = identity, typename _Proj2 = identity>
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requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
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constexpr bool
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operator()(_Iter1 __first1, _Sent1 __last1,
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_Iter2 __first2, _Sent2 __last2, _Pred __pred = {},
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_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
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{
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// TODO: implement more specializations to at least have parity with
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// std::equal.
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if constexpr (__detail::__is_normal_iterator<_Iter1>
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&& same_as<_Iter1, _Sent1>)
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return (*this)(__first1.base(), __last1.base(),
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std::move(__first2), std::move(__last2),
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std::move(__pred),
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std::move(__proj1), std::move(__proj2));
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else if constexpr (__detail::__is_normal_iterator<_Iter2>
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&& same_as<_Iter2, _Sent2>)
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return (*this)(std::move(__first1), std::move(__last1),
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__first2.base(), __last2.base(),
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std::move(__pred),
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std::move(__proj1), std::move(__proj2));
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else if constexpr (sized_sentinel_for<_Sent1, _Iter1>
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&& sized_sentinel_for<_Sent2, _Iter2>)
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{
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auto __d1 = ranges::distance(__first1, __last1);
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auto __d2 = ranges::distance(__first2, __last2);
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if (__d1 != __d2)
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return false;
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using _ValueType1 = iter_value_t<_Iter1>;
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constexpr bool __use_memcmp
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= ((is_integral_v<_ValueType1> || is_pointer_v<_ValueType1>)
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&& __memcmpable<_Iter1, _Iter2>::__value
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&& is_same_v<_Pred, ranges::equal_to>
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&& is_same_v<_Proj1, identity>
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&& is_same_v<_Proj2, identity>);
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if constexpr (__use_memcmp)
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{
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if (const size_t __len = (__last1 - __first1))
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return !std::__memcmp(__first1, __first2, __len);
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return true;
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}
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else
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{
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for (; __first1 != __last1; ++__first1, (void)++__first2)
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if (!(bool)std::__invoke(__pred,
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std::__invoke(__proj1, *__first1),
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std::__invoke(__proj2, *__first2)))
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return false;
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return true;
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}
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}
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else
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{
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for (; __first1 != __last1 && __first2 != __last2;
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++__first1, (void)++__first2)
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if (!(bool)std::__invoke(__pred,
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std::__invoke(__proj1, *__first1),
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std::__invoke(__proj2, *__first2)))
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return false;
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return __first1 == __last1 && __first2 == __last2;
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}
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}
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template<input_range _Range1, input_range _Range2,
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typename _Pred = ranges::equal_to,
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typename _Proj1 = identity, typename _Proj2 = identity>
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requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>,
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_Pred, _Proj1, _Proj2>
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constexpr bool
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operator()(_Range1&& __r1, _Range2&& __r2, _Pred __pred = {},
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_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
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{
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return (*this)(ranges::begin(__r1), ranges::end(__r1),
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ranges::begin(__r2), ranges::end(__r2),
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std::move(__pred),
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std::move(__proj1), std::move(__proj2));
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}
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};
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inline constexpr __equal_fn equal{};
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template<typename _Iter, typename _Out>
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struct in_out_result
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{
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[[no_unique_address]] _Iter in;
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[[no_unique_address]] _Out out;
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template<typename _Iter2, typename _Out2>
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requires convertible_to<const _Iter&, _Iter2>
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&& convertible_to<const _Out&, _Out2>
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constexpr
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operator in_out_result<_Iter2, _Out2>() const &
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{ return {in, out}; }
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template<typename _Iter2, typename _Out2>
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requires convertible_to<_Iter, _Iter2>
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&& convertible_to<_Out, _Out2>
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constexpr
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operator in_out_result<_Iter2, _Out2>() &&
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{ return {std::move(in), std::move(out)}; }
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};
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template<typename _Iter, typename _Out>
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using copy_result = in_out_result<_Iter, _Out>;
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template<typename _Iter, typename _Out>
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using move_result = in_out_result<_Iter, _Out>;
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template<typename _Iter1, typename _Iter2>
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using move_backward_result = in_out_result<_Iter1, _Iter2>;
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template<typename _Iter1, typename _Iter2>
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using copy_backward_result = in_out_result<_Iter1, _Iter2>;
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template<bool _IsMove,
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bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent,
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bidirectional_iterator _Out>
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requires (_IsMove
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? indirectly_movable<_Iter, _Out>
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: indirectly_copyable<_Iter, _Out>)
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constexpr conditional_t<_IsMove,
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move_backward_result<_Iter, _Out>,
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copy_backward_result<_Iter, _Out>>
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__copy_or_move_backward(_Iter __first, _Sent __last, _Out __result);
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template<bool _IsMove,
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input_iterator _Iter, sentinel_for<_Iter> _Sent,
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weakly_incrementable _Out>
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requires (_IsMove
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? indirectly_movable<_Iter, _Out>
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: indirectly_copyable<_Iter, _Out>)
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constexpr conditional_t<_IsMove,
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move_result<_Iter, _Out>,
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copy_result<_Iter, _Out>>
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__copy_or_move(_Iter __first, _Sent __last, _Out __result)
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{
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// TODO: implement more specializations to be at least on par with
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// std::copy/std::move.
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using __detail::__is_move_iterator;
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using __detail::__is_reverse_iterator;
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using __detail::__is_normal_iterator;
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if constexpr (__is_move_iterator<_Iter> && same_as<_Iter, _Sent>)
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{
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auto [__in, __out]
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= ranges::__copy_or_move<true>(std::move(__first).base(),
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std::move(__last).base(),
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std::move(__result));
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return {move_iterator{std::move(__in)}, std::move(__out)};
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}
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else if constexpr (__is_reverse_iterator<_Iter> && same_as<_Iter, _Sent>
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&& __is_reverse_iterator<_Out>)
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{
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auto [__in,__out]
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= ranges::__copy_or_move_backward<_IsMove>(std::move(__last).base(),
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std::move(__first).base(),
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std::move(__result).base());
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return {reverse_iterator{std::move(__in)},
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reverse_iterator{std::move(__out)}};
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}
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else if constexpr (__is_normal_iterator<_Iter> && same_as<_Iter, _Sent>)
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{
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auto [__in,__out]
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= ranges::__copy_or_move<_IsMove>(__first.base(), __last.base(),
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__result);
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return {decltype(__first){__in}, std::move(__out)};
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}
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else if constexpr (__is_normal_iterator<_Out>)
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{
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auto [__in,__out]
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= ranges::__copy_or_move<_IsMove>(__first, __last, __result.base());
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return {std::move(__in), decltype(__result){__out}};
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}
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else if constexpr (sized_sentinel_for<_Sent, _Iter>)
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{
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#ifdef __cpp_lib_is_constant_evaluated
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if (!std::is_constant_evaluated())
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#endif
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{
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if constexpr (__memcpyable<_Iter, _Out>::__value)
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{
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using _ValueTypeI = iter_value_t<_Iter>;
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static_assert(_IsMove
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? is_move_assignable_v<_ValueTypeI>
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: is_copy_assignable_v<_ValueTypeI>);
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auto __num = __last - __first;
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if (__num)
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__builtin_memmove(__result, __first,
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sizeof(_ValueTypeI) * __num);
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return {__first + __num, __result + __num};
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}
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}
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for (auto __n = __last - __first; __n > 0; --__n)
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{
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if constexpr (_IsMove)
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*__result = std::move(*__first);
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else
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*__result = *__first;
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++__first;
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++__result;
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}
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return {std::move(__first), std::move(__result)};
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}
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else
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{
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while (__first != __last)
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{
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if constexpr (_IsMove)
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*__result = std::move(*__first);
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else
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*__result = *__first;
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++__first;
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++__result;
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}
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return {std::move(__first), std::move(__result)};
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}
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}
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struct __copy_fn
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{
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template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
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weakly_incrementable _Out>
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requires indirectly_copyable<_Iter, _Out>
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constexpr copy_result<_Iter, _Out>
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operator()(_Iter __first, _Sent __last, _Out __result) const
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{
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return ranges::__copy_or_move<false>(std::move(__first),
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std::move(__last),
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std::move(__result));
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}
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template<input_range _Range, weakly_incrementable _Out>
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requires indirectly_copyable<iterator_t<_Range>, _Out>
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constexpr copy_result<borrowed_iterator_t<_Range>, _Out>
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operator()(_Range&& __r, _Out __result) const
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{
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return (*this)(ranges::begin(__r), ranges::end(__r),
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std::move(__result));
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}
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};
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inline constexpr __copy_fn copy{};
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struct __move_fn
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{
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template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
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weakly_incrementable _Out>
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requires indirectly_movable<_Iter, _Out>
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constexpr move_result<_Iter, _Out>
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operator()(_Iter __first, _Sent __last, _Out __result) const
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{
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return ranges::__copy_or_move<true>(std::move(__first),
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std::move(__last),
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std::move(__result));
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}
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template<input_range _Range, weakly_incrementable _Out>
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requires indirectly_movable<iterator_t<_Range>, _Out>
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constexpr move_result<borrowed_iterator_t<_Range>, _Out>
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operator()(_Range&& __r, _Out __result) const
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{
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return (*this)(ranges::begin(__r), ranges::end(__r),
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std::move(__result));
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}
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};
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inline constexpr __move_fn move{};
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template<bool _IsMove,
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bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent,
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bidirectional_iterator _Out>
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requires (_IsMove
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? indirectly_movable<_Iter, _Out>
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: indirectly_copyable<_Iter, _Out>)
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constexpr conditional_t<_IsMove,
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move_backward_result<_Iter, _Out>,
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copy_backward_result<_Iter, _Out>>
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__copy_or_move_backward(_Iter __first, _Sent __last, _Out __result)
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{
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// TODO: implement more specializations to be at least on par with
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// std::copy_backward/std::move_backward.
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using __detail::__is_reverse_iterator;
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using __detail::__is_normal_iterator;
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if constexpr (__is_reverse_iterator<_Iter> && same_as<_Iter, _Sent>
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&& __is_reverse_iterator<_Out>)
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{
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auto [__in,__out]
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= ranges::__copy_or_move<_IsMove>(std::move(__last).base(),
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std::move(__first).base(),
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std::move(__result).base());
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return {reverse_iterator{std::move(__in)},
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reverse_iterator{std::move(__out)}};
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}
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else if constexpr (__is_normal_iterator<_Iter> && same_as<_Iter, _Sent>)
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{
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auto [__in,__out]
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= ranges::__copy_or_move_backward<_IsMove>(__first.base(),
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__last.base(),
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std::move(__result));
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return {decltype(__first){__in}, std::move(__out)};
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}
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else if constexpr (__is_normal_iterator<_Out>)
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{
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auto [__in,__out]
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= ranges::__copy_or_move_backward<_IsMove>(std::move(__first),
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std::move(__last),
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__result.base());
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return {std::move(__in), decltype(__result){__out}};
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}
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else if constexpr (sized_sentinel_for<_Sent, _Iter>)
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{
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#ifdef __cpp_lib_is_constant_evaluated
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if (!std::is_constant_evaluated())
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#endif
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{
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if constexpr (__memcpyable<_Out, _Iter>::__value)
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{
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using _ValueTypeI = iter_value_t<_Iter>;
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static_assert(_IsMove
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? is_move_assignable_v<_ValueTypeI>
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: is_copy_assignable_v<_ValueTypeI>);
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auto __num = __last - __first;
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if (__num)
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__builtin_memmove(__result - __num, __first,
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sizeof(_ValueTypeI) * __num);
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return {__first + __num, __result - __num};
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}
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}
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auto __lasti = ranges::next(__first, __last);
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auto __tail = __lasti;
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for (auto __n = __last - __first; __n > 0; --__n)
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{
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--__tail;
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--__result;
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if constexpr (_IsMove)
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*__result = std::move(*__tail);
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else
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*__result = *__tail;
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}
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return {std::move(__lasti), std::move(__result)};
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}
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else
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{
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auto __lasti = ranges::next(__first, __last);
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auto __tail = __lasti;
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while (__first != __tail)
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{
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--__tail;
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--__result;
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if constexpr (_IsMove)
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*__result = std::move(*__tail);
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else
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*__result = *__tail;
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}
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return {std::move(__lasti), std::move(__result)};
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}
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}
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struct __copy_backward_fn
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{
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template<bidirectional_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
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bidirectional_iterator _Iter2>
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requires indirectly_copyable<_Iter1, _Iter2>
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constexpr copy_backward_result<_Iter1, _Iter2>
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operator()(_Iter1 __first, _Sent1 __last, _Iter2 __result) const
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{
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return ranges::__copy_or_move_backward<false>(std::move(__first),
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std::move(__last),
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std::move(__result));
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}
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template<bidirectional_range _Range, bidirectional_iterator _Iter>
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requires indirectly_copyable<iterator_t<_Range>, _Iter>
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constexpr copy_backward_result<borrowed_iterator_t<_Range>, _Iter>
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operator()(_Range&& __r, _Iter __result) const
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{
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return (*this)(ranges::begin(__r), ranges::end(__r),
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std::move(__result));
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}
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};
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inline constexpr __copy_backward_fn copy_backward{};
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struct __move_backward_fn
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{
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template<bidirectional_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
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bidirectional_iterator _Iter2>
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requires indirectly_movable<_Iter1, _Iter2>
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constexpr move_backward_result<_Iter1, _Iter2>
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operator()(_Iter1 __first, _Sent1 __last, _Iter2 __result) const
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{
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return ranges::__copy_or_move_backward<true>(std::move(__first),
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std::move(__last),
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std::move(__result));
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}
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template<bidirectional_range _Range, bidirectional_iterator _Iter>
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requires indirectly_movable<iterator_t<_Range>, _Iter>
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constexpr move_backward_result<borrowed_iterator_t<_Range>, _Iter>
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operator()(_Range&& __r, _Iter __result) const
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{
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return (*this)(ranges::begin(__r), ranges::end(__r),
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std::move(__result));
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}
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};
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inline constexpr __move_backward_fn move_backward{};
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template<typename _Iter, typename _Out>
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using copy_n_result = in_out_result<_Iter, _Out>;
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|
|
struct __copy_n_fn
|
|
{
|
|
template<input_iterator _Iter, weakly_incrementable _Out>
|
|
requires indirectly_copyable<_Iter, _Out>
|
|
constexpr copy_n_result<_Iter, _Out>
|
|
operator()(_Iter __first, iter_difference_t<_Iter> __n,
|
|
_Out __result) const
|
|
{
|
|
if constexpr (random_access_iterator<_Iter>)
|
|
{
|
|
if (__n > 0)
|
|
return ranges::copy(__first, __first + __n, std::move(__result));
|
|
}
|
|
else
|
|
{
|
|
for (; __n > 0; --__n, (void)++__result, (void)++__first)
|
|
*__result = *__first;
|
|
}
|
|
return {std::move(__first), std::move(__result)};
|
|
}
|
|
};
|
|
|
|
inline constexpr __copy_n_fn copy_n{};
|
|
|
|
struct __fill_n_fn
|
|
{
|
|
template<typename _Tp, output_iterator<const _Tp&> _Out>
|
|
constexpr _Out
|
|
operator()(_Out __first, iter_difference_t<_Out> __n,
|
|
const _Tp& __value) const
|
|
{
|
|
// TODO: implement more specializations to be at least on par with
|
|
// std::fill_n
|
|
if (__n <= 0)
|
|
return __first;
|
|
|
|
// TODO: Generalize this optimization to contiguous iterators.
|
|
if constexpr (is_pointer_v<_Out>
|
|
// Note that __is_byte already implies !is_volatile.
|
|
&& __is_byte<remove_pointer_t<_Out>>::__value
|
|
&& integral<_Tp>)
|
|
{
|
|
__builtin_memset(__first, static_cast<unsigned char>(__value), __n);
|
|
return __first + __n;
|
|
}
|
|
else if constexpr (is_scalar_v<_Tp>)
|
|
{
|
|
const auto __tmp = __value;
|
|
for (; __n > 0; --__n, (void)++__first)
|
|
*__first = __tmp;
|
|
return __first;
|
|
}
|
|
else
|
|
{
|
|
for (; __n > 0; --__n, (void)++__first)
|
|
*__first = __value;
|
|
return __first;
|
|
}
|
|
}
|
|
};
|
|
|
|
inline constexpr __fill_n_fn fill_n{};
|
|
|
|
struct __fill_fn
|
|
{
|
|
template<typename _Tp,
|
|
output_iterator<const _Tp&> _Out, sentinel_for<_Out> _Sent>
|
|
constexpr _Out
|
|
operator()(_Out __first, _Sent __last, const _Tp& __value) const
|
|
{
|
|
// TODO: implement more specializations to be at least on par with
|
|
// std::fill
|
|
if constexpr (sized_sentinel_for<_Sent, _Out>)
|
|
{
|
|
const auto __len = __last - __first;
|
|
return ranges::fill_n(__first, __len, __value);
|
|
}
|
|
else if constexpr (is_scalar_v<_Tp>)
|
|
{
|
|
const auto __tmp = __value;
|
|
for (; __first != __last; ++__first)
|
|
*__first = __tmp;
|
|
return __first;
|
|
}
|
|
else
|
|
{
|
|
for (; __first != __last; ++__first)
|
|
*__first = __value;
|
|
return __first;
|
|
}
|
|
}
|
|
|
|
template<typename _Tp, output_range<const _Tp&> _Range>
|
|
constexpr borrowed_iterator_t<_Range>
|
|
operator()(_Range&& __r, const _Tp& __value) const
|
|
{
|
|
return (*this)(ranges::begin(__r), ranges::end(__r), __value);
|
|
}
|
|
};
|
|
|
|
inline constexpr __fill_fn fill{};
|
|
}
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
|
} // namespace std
|
|
#endif // concepts
|
|
#endif // C++20
|
|
#endif // _RANGES_ALGOBASE_H
|