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3651 lines (3320 loc) · 114 KB
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// Core algorithmic facilities -*- C++ -*-
// Copyright (C) 2020-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file bits/ranges_algo.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{algorithm}
*/
#ifndef _RANGES_ALGO_H
#define _RANGES_ALGO_H 1
#if __cplusplus > 201703L
#include <bits/ranges_algobase.h>
#include <bits/ranges_util.h>
#include <bits/uniform_int_dist.h> // concept uniform_random_bit_generator
#if __cpp_lib_concepts
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace ranges
{
namespace __detail
{
template<typename _Comp, typename _Proj>
constexpr auto
__make_comp_proj(_Comp& __comp, _Proj& __proj)
{
return [&] (auto&& __lhs, auto&& __rhs) -> bool {
using _TL = decltype(__lhs);
using _TR = decltype(__rhs);
return std::__invoke(__comp,
std::__invoke(__proj, std::forward<_TL>(__lhs)),
std::__invoke(__proj, std::forward<_TR>(__rhs)));
};
}
template<typename _Pred, typename _Proj>
constexpr auto
__make_pred_proj(_Pred& __pred, _Proj& __proj)
{
return [&] <typename _Tp> (_Tp&& __arg) -> bool {
return std::__invoke(__pred,
std::__invoke(__proj, std::forward<_Tp>(__arg)));
};
}
} // namespace __detail
struct __all_of_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Proj = identity,
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
constexpr bool
operator()(_Iter __first, _Sent __last,
_Pred __pred, _Proj __proj = {}) const
{
for (; __first != __last; ++__first)
if (!(bool)std::__invoke(__pred, std::__invoke(__proj, *__first)))
return false;
return true;
}
template<input_range _Range, typename _Proj = identity,
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>>
_Pred>
constexpr bool
operator()(_Range&& __r, _Pred __pred, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__pred), std::move(__proj));
}
};
inline constexpr __all_of_fn all_of{};
struct __any_of_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Proj = identity,
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
constexpr bool
operator()(_Iter __first, _Sent __last,
_Pred __pred, _Proj __proj = {}) const
{
for (; __first != __last; ++__first)
if (std::__invoke(__pred, std::__invoke(__proj, *__first)))
return true;
return false;
}
template<input_range _Range, typename _Proj = identity,
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>>
_Pred>
constexpr bool
operator()(_Range&& __r, _Pred __pred, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__pred), std::move(__proj));
}
};
inline constexpr __any_of_fn any_of{};
struct __none_of_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Proj = identity,
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
constexpr bool
operator()(_Iter __first, _Sent __last,
_Pred __pred, _Proj __proj = {}) const
{
for (; __first != __last; ++__first)
if (std::__invoke(__pred, std::__invoke(__proj, *__first)))
return false;
return true;
}
template<input_range _Range, typename _Proj = identity,
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>>
_Pred>
constexpr bool
operator()(_Range&& __r, _Pred __pred, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__pred), std::move(__proj));
}
};
inline constexpr __none_of_fn none_of{};
template<typename _Iter, typename _Fp>
struct in_fun_result
{
[[no_unique_address]] _Iter in;
[[no_unique_address]] _Fp fun;
template<typename _Iter2, typename _F2p>
requires convertible_to<const _Iter&, _Iter2>
&& convertible_to<const _Fp&, _F2p>
constexpr
operator in_fun_result<_Iter2, _F2p>() const &
{ return {in, fun}; }
template<typename _Iter2, typename _F2p>
requires convertible_to<_Iter, _Iter2> && convertible_to<_Fp, _F2p>
constexpr
operator in_fun_result<_Iter2, _F2p>() &&
{ return {std::move(in), std::move(fun)}; }
};
template<typename _Iter, typename _Fp>
using for_each_result = in_fun_result<_Iter, _Fp>;
struct __for_each_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Proj = identity,
indirectly_unary_invocable<projected<_Iter, _Proj>> _Fun>
constexpr for_each_result<_Iter, _Fun>
operator()(_Iter __first, _Sent __last, _Fun __f, _Proj __proj = {}) const
{
for (; __first != __last; ++__first)
std::__invoke(__f, std::__invoke(__proj, *__first));
return { std::move(__first), std::move(__f) };
}
template<input_range _Range, typename _Proj = identity,
indirectly_unary_invocable<projected<iterator_t<_Range>, _Proj>>
_Fun>
constexpr for_each_result<borrowed_iterator_t<_Range>, _Fun>
operator()(_Range&& __r, _Fun __f, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__f), std::move(__proj));
}
};
inline constexpr __for_each_fn for_each{};
template<typename _Iter, typename _Fp>
using for_each_n_result = in_fun_result<_Iter, _Fp>;
struct __for_each_n_fn
{
template<input_iterator _Iter, typename _Proj = identity,
indirectly_unary_invocable<projected<_Iter, _Proj>> _Fun>
constexpr for_each_n_result<_Iter, _Fun>
operator()(_Iter __first, iter_difference_t<_Iter> __n,
_Fun __f, _Proj __proj = {}) const
{
if constexpr (random_access_iterator<_Iter>)
{
if (__n <= 0)
return {std::move(__first), std::move(__f)};
auto __last = __first + __n;
return ranges::for_each(std::move(__first), std::move(__last),
std::move(__f), std::move(__proj));
}
else
{
while (__n-- > 0)
{
std::__invoke(__f, std::__invoke(__proj, *__first));
++__first;
}
return {std::move(__first), std::move(__f)};
}
}
};
inline constexpr __for_each_n_fn for_each_n{};
// find, find_if and find_if_not are defined in <bits/ranges_util.h>.
struct __find_first_of_fn
{
template<input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
forward_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
typename _Pred = ranges::equal_to,
typename _Proj1 = identity, typename _Proj2 = identity>
requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
constexpr _Iter1
operator()(_Iter1 __first1, _Sent1 __last1,
_Iter2 __first2, _Sent2 __last2, _Pred __pred = {},
_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
{
for (; __first1 != __last1; ++__first1)
for (auto __iter = __first2; __iter != __last2; ++__iter)
if (std::__invoke(__pred,
std::__invoke(__proj1, *__first1),
std::__invoke(__proj2, *__iter)))
return __first1;
return __first1;
}
template<input_range _Range1, forward_range _Range2,
typename _Pred = ranges::equal_to,
typename _Proj1 = identity, typename _Proj2 = identity>
requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>,
_Pred, _Proj1, _Proj2>
constexpr borrowed_iterator_t<_Range1>
operator()(_Range1&& __r1, _Range2&& __r2, _Pred __pred = {},
_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
{
return (*this)(ranges::begin(__r1), ranges::end(__r1),
ranges::begin(__r2), ranges::end(__r2),
std::move(__pred),
std::move(__proj1), std::move(__proj2));
}
};
inline constexpr __find_first_of_fn find_first_of{};
struct __count_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Tp, typename _Proj = identity>
requires indirect_binary_predicate<ranges::equal_to,
projected<_Iter, _Proj>,
const _Tp*>
constexpr iter_difference_t<_Iter>
operator()(_Iter __first, _Sent __last,
const _Tp& __value, _Proj __proj = {}) const
{
iter_difference_t<_Iter> __n = 0;
for (; __first != __last; ++__first)
if (std::__invoke(__proj, *__first) == __value)
++__n;
return __n;
}
template<input_range _Range, typename _Tp, typename _Proj = identity>
requires indirect_binary_predicate<ranges::equal_to,
projected<iterator_t<_Range>, _Proj>,
const _Tp*>
constexpr range_difference_t<_Range>
operator()(_Range&& __r, const _Tp& __value, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
__value, std::move(__proj));
}
};
inline constexpr __count_fn count{};
struct __count_if_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Proj = identity,
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
constexpr iter_difference_t<_Iter>
operator()(_Iter __first, _Sent __last,
_Pred __pred, _Proj __proj = {}) const
{
iter_difference_t<_Iter> __n = 0;
for (; __first != __last; ++__first)
if (std::__invoke(__pred, std::__invoke(__proj, *__first)))
++__n;
return __n;
}
template<input_range _Range,
typename _Proj = identity,
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>>
_Pred>
constexpr range_difference_t<_Range>
operator()(_Range&& __r, _Pred __pred, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__pred), std::move(__proj));
}
};
inline constexpr __count_if_fn count_if{};
// in_in_result, mismatch and search are defined in <bits/ranges_util.h>.
struct __search_n_fn
{
template<forward_iterator _Iter, sentinel_for<_Iter> _Sent, typename _Tp,
typename _Pred = ranges::equal_to, typename _Proj = identity>
requires indirectly_comparable<_Iter, const _Tp*, _Pred, _Proj>
constexpr subrange<_Iter>
operator()(_Iter __first, _Sent __last, iter_difference_t<_Iter> __count,
const _Tp& __value, _Pred __pred = {}, _Proj __proj = {}) const
{
if (__count <= 0)
return {__first, __first};
auto __value_comp = [&] <typename _Rp> (_Rp&& __arg) -> bool {
return std::__invoke(__pred, std::forward<_Rp>(__arg), __value);
};
if (__count == 1)
{
__first = ranges::find_if(std::move(__first), __last,
std::move(__value_comp),
std::move(__proj));
if (__first == __last)
return {__first, __first};
else
{
auto __end = __first;
return {__first, ++__end};
}
}
if constexpr (sized_sentinel_for<_Sent, _Iter>
&& random_access_iterator<_Iter>)
{
auto __tail_size = __last - __first;
auto __remainder = __count;
while (__remainder <= __tail_size)
{
__first += __remainder;
__tail_size -= __remainder;
auto __backtrack = __first;
while (__value_comp(std::__invoke(__proj, *--__backtrack)))
{
if (--__remainder == 0)
return {__first - __count, __first};
}
__remainder = __count + 1 - (__first - __backtrack);
}
auto __i = __first + __tail_size;
return {__i, __i};
}
else
{
__first = ranges::find_if(__first, __last, __value_comp, __proj);
while (__first != __last)
{
auto __n = __count;
auto __i = __first;
++__i;
while (__i != __last && __n != 1
&& __value_comp(std::__invoke(__proj, *__i)))
{
++__i;
--__n;
}
if (__n == 1)
return {__first, __i};
if (__i == __last)
return {__i, __i};
__first = ranges::find_if(++__i, __last, __value_comp, __proj);
}
return {__first, __first};
}
}
template<forward_range _Range, typename _Tp,
typename _Pred = ranges::equal_to, typename _Proj = identity>
requires indirectly_comparable<iterator_t<_Range>, const _Tp*,
_Pred, _Proj>
constexpr borrowed_subrange_t<_Range>
operator()(_Range&& __r, range_difference_t<_Range> __count,
const _Tp& __value, _Pred __pred = {}, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__count), __value,
std::move(__pred), std::move(__proj));
}
};
inline constexpr __search_n_fn search_n{};
struct __find_end_fn
{
template<forward_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
forward_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
typename _Pred = ranges::equal_to,
typename _Proj1 = identity, typename _Proj2 = identity>
requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
constexpr subrange<_Iter1>
operator()(_Iter1 __first1, _Sent1 __last1,
_Iter2 __first2, _Sent2 __last2, _Pred __pred = {},
_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
{
if constexpr (bidirectional_iterator<_Iter1>
&& bidirectional_iterator<_Iter2>)
{
auto __i1 = ranges::next(__first1, __last1);
auto __i2 = ranges::next(__first2, __last2);
auto __rresult
= ranges::search(reverse_iterator<_Iter1>{__i1},
reverse_iterator<_Iter1>{__first1},
reverse_iterator<_Iter2>{__i2},
reverse_iterator<_Iter2>{__first2},
std::move(__pred),
std::move(__proj1), std::move(__proj2));
auto __result_first = ranges::end(__rresult).base();
auto __result_last = ranges::begin(__rresult).base();
if (__result_last == __first1)
return {__i1, __i1};
else
return {__result_first, __result_last};
}
else
{
auto __i = ranges::next(__first1, __last1);
if (__first2 == __last2)
return {__i, __i};
auto __result_begin = __i;
auto __result_end = __i;
for (;;)
{
auto __new_range = ranges::search(__first1, __last1,
__first2, __last2,
__pred, __proj1, __proj2);
auto __new_result_begin = ranges::begin(__new_range);
auto __new_result_end = ranges::end(__new_range);
if (__new_result_begin == __last1)
return {__result_begin, __result_end};
else
{
__result_begin = __new_result_begin;
__result_end = __new_result_end;
__first1 = __result_begin;
++__first1;
}
}
}
}
template<forward_range _Range1, forward_range _Range2,
typename _Pred = ranges::equal_to,
typename _Proj1 = identity, typename _Proj2 = identity>
requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>,
_Pred, _Proj1, _Proj2>
constexpr borrowed_subrange_t<_Range1>
operator()(_Range1&& __r1, _Range2&& __r2, _Pred __pred = {},
_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
{
return (*this)(ranges::begin(__r1), ranges::end(__r1),
ranges::begin(__r2), ranges::end(__r2),
std::move(__pred),
std::move(__proj1), std::move(__proj2));
}
};
inline constexpr __find_end_fn find_end{};
struct __adjacent_find_fn
{
template<forward_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Proj = identity,
indirect_binary_predicate<projected<_Iter, _Proj>,
projected<_Iter, _Proj>> _Pred
= ranges::equal_to>
constexpr _Iter
operator()(_Iter __first, _Sent __last,
_Pred __pred = {}, _Proj __proj = {}) const
{
if (__first == __last)
return __first;
auto __next = __first;
for (; ++__next != __last; __first = __next)
{
if (std::__invoke(__pred,
std::__invoke(__proj, *__first),
std::__invoke(__proj, *__next)))
return __first;
}
return __next;
}
template<forward_range _Range, typename _Proj = identity,
indirect_binary_predicate<
projected<iterator_t<_Range>, _Proj>,
projected<iterator_t<_Range>, _Proj>> _Pred = ranges::equal_to>
constexpr borrowed_iterator_t<_Range>
operator()(_Range&& __r, _Pred __pred = {}, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__pred), std::move(__proj));
}
};
inline constexpr __adjacent_find_fn adjacent_find{};
struct __is_permutation_fn
{
template<forward_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
forward_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
typename _Proj1 = identity, typename _Proj2 = identity,
indirect_equivalence_relation<projected<_Iter1, _Proj1>,
projected<_Iter2, _Proj2>> _Pred
= ranges::equal_to>
constexpr bool
operator()(_Iter1 __first1, _Sent1 __last1,
_Iter2 __first2, _Sent2 __last2, _Pred __pred = {},
_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
{
constexpr bool __sized_iters
= (sized_sentinel_for<_Sent1, _Iter1>
&& sized_sentinel_for<_Sent2, _Iter2>);
if constexpr (__sized_iters)
{
auto __d1 = ranges::distance(__first1, __last1);
auto __d2 = ranges::distance(__first2, __last2);
if (__d1 != __d2)
return false;
}
// Efficiently compare identical prefixes: O(N) if sequences
// have the same elements in the same order.
for (; __first1 != __last1 && __first2 != __last2;
++__first1, (void)++__first2)
if (!(bool)std::__invoke(__pred,
std::__invoke(__proj1, *__first1),
std::__invoke(__proj2, *__first2)))
break;
if constexpr (__sized_iters)
{
if (__first1 == __last1)
return true;
}
else
{
auto __d1 = ranges::distance(__first1, __last1);
auto __d2 = ranges::distance(__first2, __last2);
if (__d1 == 0 && __d2 == 0)
return true;
if (__d1 != __d2)
return false;
}
for (auto __scan = __first1; __scan != __last1; ++__scan)
{
auto&& __proj_scan = std::__invoke(__proj1, *__scan);
auto __comp_scan = [&] <typename _Tp> (_Tp&& __arg) -> bool {
return std::__invoke(__pred, __proj_scan,
std::forward<_Tp>(__arg));
};
if (__scan != ranges::find_if(__first1, __scan,
__comp_scan, __proj1))
continue; // We've seen this one before.
auto __matches = ranges::count_if(__first2, __last2,
__comp_scan, __proj2);
if (__matches == 0
|| ranges::count_if(__scan, __last1,
__comp_scan, __proj1) != __matches)
return false;
}
return true;
}
template<forward_range _Range1, forward_range _Range2,
typename _Proj1 = identity, typename _Proj2 = identity,
indirect_equivalence_relation<
projected<iterator_t<_Range1>, _Proj1>,
projected<iterator_t<_Range2>, _Proj2>> _Pred = ranges::equal_to>
constexpr bool
operator()(_Range1&& __r1, _Range2&& __r2, _Pred __pred = {},
_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
{
return (*this)(ranges::begin(__r1), ranges::end(__r1),
ranges::begin(__r2), ranges::end(__r2),
std::move(__pred),
std::move(__proj1), std::move(__proj2));
}
};
inline constexpr __is_permutation_fn is_permutation{};
template<typename _Iter, typename _Out>
using copy_if_result = in_out_result<_Iter, _Out>;
struct __copy_if_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
weakly_incrementable _Out, typename _Proj = identity,
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
requires indirectly_copyable<_Iter, _Out>
constexpr copy_if_result<_Iter, _Out>
operator()(_Iter __first, _Sent __last, _Out __result,
_Pred __pred, _Proj __proj = {}) const
{
for (; __first != __last; ++__first)
if (std::__invoke(__pred, std::__invoke(__proj, *__first)))
{
*__result = *__first;
++__result;
}
return {std::move(__first), std::move(__result)};
}
template<input_range _Range, weakly_incrementable _Out,
typename _Proj = identity,
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>>
_Pred>
requires indirectly_copyable<iterator_t<_Range>, _Out>
constexpr copy_if_result<borrowed_iterator_t<_Range>, _Out>
operator()(_Range&& __r, _Out __result,
_Pred __pred, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__result),
std::move(__pred), std::move(__proj));
}
};
inline constexpr __copy_if_fn copy_if{};
template<typename _Iter1, typename _Iter2>
using swap_ranges_result = in_in_result<_Iter1, _Iter2>;
struct __swap_ranges_fn
{
template<input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
input_iterator _Iter2, sentinel_for<_Iter2> _Sent2>
requires indirectly_swappable<_Iter1, _Iter2>
constexpr swap_ranges_result<_Iter1, _Iter2>
operator()(_Iter1 __first1, _Sent1 __last1,
_Iter2 __first2, _Sent2 __last2) const
{
for (; __first1 != __last1 && __first2 != __last2;
++__first1, (void)++__first2)
ranges::iter_swap(__first1, __first2);
return {std::move(__first1), std::move(__first2)};
}
template<input_range _Range1, input_range _Range2>
requires indirectly_swappable<iterator_t<_Range1>, iterator_t<_Range2>>
constexpr swap_ranges_result<borrowed_iterator_t<_Range1>,
borrowed_iterator_t<_Range2>>
operator()(_Range1&& __r1, _Range2&& __r2) const
{
return (*this)(ranges::begin(__r1), ranges::end(__r1),
ranges::begin(__r2), ranges::end(__r2));
}
};
inline constexpr __swap_ranges_fn swap_ranges{};
template<typename _Iter, typename _Out>
using unary_transform_result = in_out_result<_Iter, _Out>;
template<typename _Iter1, typename _Iter2, typename _Out>
struct in_in_out_result
{
[[no_unique_address]] _Iter1 in1;
[[no_unique_address]] _Iter2 in2;
[[no_unique_address]] _Out out;
template<typename _IIter1, typename _IIter2, typename _OOut>
requires convertible_to<const _Iter1&, _IIter1>
&& convertible_to<const _Iter2&, _IIter2>
&& convertible_to<const _Out&, _OOut>
constexpr
operator in_in_out_result<_IIter1, _IIter2, _OOut>() const &
{ return {in1, in2, out}; }
template<typename _IIter1, typename _IIter2, typename _OOut>
requires convertible_to<_Iter1, _IIter1>
&& convertible_to<_Iter2, _IIter2>
&& convertible_to<_Out, _OOut>
constexpr
operator in_in_out_result<_IIter1, _IIter2, _OOut>() &&
{ return {std::move(in1), std::move(in2), std::move(out)}; }
};
template<typename _Iter1, typename _Iter2, typename _Out>
using binary_transform_result = in_in_out_result<_Iter1, _Iter2, _Out>;
struct __transform_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
weakly_incrementable _Out,
copy_constructible _Fp, typename _Proj = identity>
requires indirectly_writable<_Out,
indirect_result_t<_Fp&,
projected<_Iter, _Proj>>>
constexpr unary_transform_result<_Iter, _Out>
operator()(_Iter __first1, _Sent __last1, _Out __result,
_Fp __op, _Proj __proj = {}) const
{
for (; __first1 != __last1; ++__first1, (void)++__result)
*__result = std::__invoke(__op, std::__invoke(__proj, *__first1));
return {std::move(__first1), std::move(__result)};
}
template<input_range _Range, weakly_incrementable _Out,
copy_constructible _Fp, typename _Proj = identity>
requires indirectly_writable<_Out,
indirect_result_t<_Fp&,
projected<iterator_t<_Range>, _Proj>>>
constexpr unary_transform_result<borrowed_iterator_t<_Range>, _Out>
operator()(_Range&& __r, _Out __result, _Fp __op, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__result),
std::move(__op), std::move(__proj));
}
template<input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
input_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
weakly_incrementable _Out, copy_constructible _Fp,
typename _Proj1 = identity, typename _Proj2 = identity>
requires indirectly_writable<_Out,
indirect_result_t<_Fp&,
projected<_Iter1, _Proj1>,
projected<_Iter2, _Proj2>>>
constexpr binary_transform_result<_Iter1, _Iter2, _Out>
operator()(_Iter1 __first1, _Sent1 __last1,
_Iter2 __first2, _Sent2 __last2,
_Out __result, _Fp __binary_op,
_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
{
for (; __first1 != __last1 && __first2 != __last2;
++__first1, (void)++__first2, ++__result)
*__result = std::__invoke(__binary_op,
std::__invoke(__proj1, *__first1),
std::__invoke(__proj2, *__first2));
return {std::move(__first1), std::move(__first2), std::move(__result)};
}
template<input_range _Range1, input_range _Range2,
weakly_incrementable _Out, copy_constructible _Fp,
typename _Proj1 = identity, typename _Proj2 = identity>
requires indirectly_writable<_Out,
indirect_result_t<_Fp&,
projected<iterator_t<_Range1>, _Proj1>,
projected<iterator_t<_Range2>, _Proj2>>>
constexpr binary_transform_result<borrowed_iterator_t<_Range1>,
borrowed_iterator_t<_Range2>, _Out>
operator()(_Range1&& __r1, _Range2&& __r2, _Out __result, _Fp __binary_op,
_Proj1 __proj1 = {}, _Proj2 __proj2 = {}) const
{
return (*this)(ranges::begin(__r1), ranges::end(__r1),
ranges::begin(__r2), ranges::end(__r2),
std::move(__result), std::move(__binary_op),
std::move(__proj1), std::move(__proj2));
}
};
inline constexpr __transform_fn transform{};
struct __replace_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Tp1, typename _Tp2, typename _Proj = identity>
requires indirectly_writable<_Iter, const _Tp2&>
&& indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>,
const _Tp1*>
constexpr _Iter
operator()(_Iter __first, _Sent __last,
const _Tp1& __old_value, const _Tp2& __new_value,
_Proj __proj = {}) const
{
for (; __first != __last; ++__first)
if (std::__invoke(__proj, *__first) == __old_value)
*__first = __new_value;
return __first;
}
template<input_range _Range,
typename _Tp1, typename _Tp2, typename _Proj = identity>
requires indirectly_writable<iterator_t<_Range>, const _Tp2&>
&& indirect_binary_predicate<ranges::equal_to,
projected<iterator_t<_Range>, _Proj>,
const _Tp1*>
constexpr borrowed_iterator_t<_Range>
operator()(_Range&& __r,
const _Tp1& __old_value, const _Tp2& __new_value,
_Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
__old_value, __new_value, std::move(__proj));
}
};
inline constexpr __replace_fn replace{};
struct __replace_if_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Tp, typename _Proj = identity,
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
requires indirectly_writable<_Iter, const _Tp&>
constexpr _Iter
operator()(_Iter __first, _Sent __last,
_Pred __pred, const _Tp& __new_value, _Proj __proj = {}) const
{
for (; __first != __last; ++__first)
if (std::__invoke(__pred, std::__invoke(__proj, *__first)))
*__first = __new_value;
return std::move(__first);
}
template<input_range _Range, typename _Tp, typename _Proj = identity,
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>>
_Pred>
requires indirectly_writable<iterator_t<_Range>, const _Tp&>
constexpr borrowed_iterator_t<_Range>
operator()(_Range&& __r,
_Pred __pred, const _Tp& __new_value, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__pred), __new_value, std::move(__proj));
}
};
inline constexpr __replace_if_fn replace_if{};
template<typename _Iter, typename _Out>
using replace_copy_result = in_out_result<_Iter, _Out>;
struct __replace_copy_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Tp1, typename _Tp2, output_iterator<const _Tp2&> _Out,
typename _Proj = identity>
requires indirectly_copyable<_Iter, _Out>
&& indirect_binary_predicate<ranges::equal_to,
projected<_Iter, _Proj>, const _Tp1*>
constexpr replace_copy_result<_Iter, _Out>
operator()(_Iter __first, _Sent __last, _Out __result,
const _Tp1& __old_value, const _Tp2& __new_value,
_Proj __proj = {}) const
{
for (; __first != __last; ++__first, (void)++__result)
if (std::__invoke(__proj, *__first) == __old_value)
*__result = __new_value;
else
*__result = *__first;
return {std::move(__first), std::move(__result)};
}
template<input_range _Range, typename _Tp1, typename _Tp2,
output_iterator<const _Tp2&> _Out, typename _Proj = identity>
requires indirectly_copyable<iterator_t<_Range>, _Out>
&& indirect_binary_predicate<ranges::equal_to,
projected<iterator_t<_Range>, _Proj>,
const _Tp1*>
constexpr replace_copy_result<borrowed_iterator_t<_Range>, _Out>
operator()(_Range&& __r, _Out __result,
const _Tp1& __old_value, const _Tp2& __new_value,
_Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__result), __old_value,
__new_value, std::move(__proj));
}
};
inline constexpr __replace_copy_fn replace_copy{};
template<typename _Iter, typename _Out>
using replace_copy_if_result = in_out_result<_Iter, _Out>;
struct __replace_copy_if_fn
{
template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
typename _Tp, output_iterator<const _Tp&> _Out,
typename _Proj = identity,
indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
requires indirectly_copyable<_Iter, _Out>
constexpr replace_copy_if_result<_Iter, _Out>
operator()(_Iter __first, _Sent __last, _Out __result,
_Pred __pred, const _Tp& __new_value, _Proj __proj = {}) const
{
for (; __first != __last; ++__first, (void)++__result)
if (std::__invoke(__pred, std::__invoke(__proj, *__first)))
*__result = __new_value;
else
*__result = *__first;
return {std::move(__first), std::move(__result)};
}
template<input_range _Range,
typename _Tp, output_iterator<const _Tp&> _Out,
typename _Proj = identity,
indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>>
_Pred>
requires indirectly_copyable<iterator_t<_Range>, _Out>
constexpr replace_copy_if_result<borrowed_iterator_t<_Range>, _Out>
operator()(_Range&& __r, _Out __result,
_Pred __pred, const _Tp& __new_value, _Proj __proj = {}) const
{
return (*this)(ranges::begin(__r), ranges::end(__r),
std::move(__result), std::move(__pred),
__new_value, std::move(__proj));
}
};
inline constexpr __replace_copy_if_fn replace_copy_if{};
struct __generate_n_fn
{
template<input_or_output_iterator _Out, copy_constructible _Fp>
requires invocable<_Fp&>
&& indirectly_writable<_Out, invoke_result_t<_Fp&>>
constexpr _Out
operator()(_Out __first, iter_difference_t<_Out> __n, _Fp __gen) const
{
for (; __n > 0; --__n, (void)++__first)
*__first = std::__invoke(__gen);
return __first;
}
};
inline constexpr __generate_n_fn generate_n{};
struct __generate_fn
{
template<input_or_output_iterator _Out, sentinel_for<_Out> _Sent,
copy_constructible _Fp>
requires invocable<_Fp&>
&& indirectly_writable<_Out, invoke_result_t<_Fp&>>
constexpr _Out
operator()(_Out __first, _Sent __last, _Fp __gen) const
{
for (; __first != __last; ++__first)
*__first = std::__invoke(__gen);
return __first;
}
template<typename _Range, copy_constructible _Fp>
requires invocable<_Fp&> && output_range<_Range, invoke_result_t<_Fp&>>
constexpr borrowed_iterator_t<_Range>
operator()(_Range&& __r, _Fp __gen) const
{
return (*this)(ranges::begin(__r), ranges::end(__r), std::move(__gen));
}
};
inline constexpr __generate_fn generate{};
struct __remove_if_fn
{
template<permutable _Iter, sentinel_for<_Iter> _Sent,