30#ifndef _RANGES_ALGOBASE_H
31#define _RANGES_ALGOBASE_H 1
33#if __cplusplus > 201703L
44namespace std _GLIBCXX_VISIBILITY(default)
46_GLIBCXX_BEGIN_NAMESPACE_VERSION
51 template<
typename _Tp>
52 constexpr inline bool __is_normal_iterator =
false;
54 template<
typename _Iterator,
typename _Container>
56 __is_normal_iterator<__gnu_cxx::__normal_iterator<_Iterator,
59 template<
typename _Tp>
60 constexpr inline bool __is_reverse_iterator =
false;
62 template<
typename _Iterator>
64 __is_reverse_iterator<reverse_iterator<_Iterator>> =
true;
66 template<
typename _Tp>
67 constexpr inline bool __is_move_iterator =
false;
69 template<
typename _Iterator>
71 __is_move_iterator<move_iterator<_Iterator>> =
true;
74#if __cplusplus > 202002L
75 template<
typename _Out,
typename _Tp>
76 struct out_value_result
78 [[no_unique_address]] _Out out;
79 [[no_unique_address]] _Tp value;
81 template<
typename _Out2,
typename _Tp2>
82 requires convertible_to<const _Out&, _Out2>
83 && convertible_to<const _Tp&, _Tp2>
85 operator out_value_result<_Out2, _Tp2>() const &
86 {
return {out, value}; }
88 template<
typename _Out2,
typename _Tp2>
89 requires convertible_to<_Out, _Out2>
90 && convertible_to<_Tp, _Tp2>
92 operator out_value_result<_Out2, _Tp2>() &&
96#define __cpp_lib_ranges_iota 202202L
98 template<
typename _Out,
typename _Tp>
99 using iota_result = out_value_result<_Out, _Tp>;
103 template<input_or_output_iterator _Out, sentinel_for<_Out> _Sent, weakly_incrementable _Tp>
104 requires indirectly_writable<_Out, const _Tp&>
105 constexpr iota_result<_Out, _Tp>
106 operator()(_Out __first, _Sent __last, _Tp __value)
const
108 while (__first != __last)
110 *__first =
static_cast<const _Tp&
>(__value);
117 template<weakly_incrementable _Tp, output_range<const _Tp&> _Range>
118 constexpr iota_result<borrowed_iterator_t<_Range>, _Tp>
119 operator()(_Range&& __r, _Tp __value)
const
120 {
return (*
this)(ranges::begin(__r), ranges::end(__r),
std::move(__value)); }
123 inline constexpr __iota_fn iota{};
128 template<input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
129 input_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
130 typename _Pred = ranges::equal_to,
131 typename _Proj1 =
identity,
typename _Proj2 =
identity>
132 requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
134 operator()(_Iter1 __first1, _Sent1 __last1,
135 _Iter2 __first2, _Sent2 __last2, _Pred __pred = {},
136 _Proj1 __proj1 = {}, _Proj2 __proj2 = {})
const
140 if constexpr (__detail::__is_normal_iterator<_Iter1>
141 && same_as<_Iter1, _Sent1>)
142 return (*
this)(__first1.base(), __last1.base(),
146 else if constexpr (__detail::__is_normal_iterator<_Iter2>
147 && same_as<_Iter2, _Sent2>)
149 __first2.base(), __last2.base(),
152 else if constexpr (sized_sentinel_for<_Sent1, _Iter1>
153 && sized_sentinel_for<_Sent2, _Iter2>)
155 auto __d1 = ranges::distance(__first1, __last1);
156 auto __d2 = ranges::distance(__first2, __last2);
160 using _ValueType1 = iter_value_t<_Iter1>;
161 constexpr bool __use_memcmp
162 = ((is_integral_v<_ValueType1> || is_pointer_v<_ValueType1>)
163 && __memcmpable<_Iter1, _Iter2>::__value
164 && is_same_v<_Pred, ranges::equal_to>
165 && is_same_v<_Proj1, identity>
166 && is_same_v<_Proj2, identity>);
167 if constexpr (__use_memcmp)
169 if (
const size_t __len = (__last1 - __first1))
170 return !std::__memcmp(__first1, __first2, __len);
175 for (; __first1 != __last1; ++__first1, (void)++__first2)
185 for (; __first1 != __last1 && __first2 != __last2;
186 ++__first1, (void)++__first2)
191 return __first1 == __last1 && __first2 == __last2;
195 template<input_range _Range1, input_range _Range2,
196 typename _Pred = ranges::equal_to,
197 typename _Proj1 = identity,
typename _Proj2 = identity>
198 requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>,
199 _Pred, _Proj1, _Proj2>
201 operator()(_Range1&& __r1, _Range2&& __r2, _Pred __pred = {},
202 _Proj1 __proj1 = {}, _Proj2 __proj2 = {})
const
204 return (*
this)(ranges::begin(__r1), ranges::end(__r1),
205 ranges::begin(__r2), ranges::end(__r2),
211 inline constexpr __equal_fn equal{};
215 template<
bool _IsMove,
typename _OutIter,
typename _InIter>
216 [[__gnu__::__always_inline__]]
218 __assign_one(_OutIter& __out, _InIter& __in)
220 if constexpr (_IsMove)
221 *__out = ranges::iter_move(__in);
227 template<
typename _Iter,
typename _Out>
230 [[no_unique_address]] _Iter in;
231 [[no_unique_address]] _Out out;
233 template<
typename _Iter2,
typename _Out2>
234 requires convertible_to<const _Iter&, _Iter2>
235 && convertible_to<const _Out&, _Out2>
237 operator in_out_result<_Iter2, _Out2>() const &
238 {
return {in, out}; }
240 template<
typename _Iter2,
typename _Out2>
241 requires convertible_to<_Iter, _Iter2>
242 && convertible_to<_Out, _Out2>
244 operator in_out_result<_Iter2, _Out2>() &&
248 template<
typename _Iter,
typename _Out>
249 using copy_result = in_out_result<_Iter, _Out>;
251 template<
typename _Iter,
typename _Out>
252 using move_result = in_out_result<_Iter, _Out>;
254 template<
typename _Iter1,
typename _Iter2>
255 using move_backward_result = in_out_result<_Iter1, _Iter2>;
257 template<
typename _Iter1,
typename _Iter2>
258 using copy_backward_result = in_out_result<_Iter1, _Iter2>;
260 template<
bool _IsMove,
261 bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent,
262 bidirectional_iterator _Out>
264 ? indirectly_movable<_Iter, _Out>
265 : indirectly_copyable<_Iter, _Out>)
266 constexpr __conditional_t<_IsMove,
267 move_backward_result<_Iter, _Out>,
268 copy_backward_result<_Iter, _Out>>
269 __copy_or_move_backward(_Iter __first, _Sent __last, _Out __result);
271 template<
bool _IsMove,
272 input_iterator _Iter, sentinel_for<_Iter> _Sent,
273 weakly_incrementable _Out>
275 ? indirectly_movable<_Iter, _Out>
276 : indirectly_copyable<_Iter, _Out>)
277 constexpr __conditional_t<_IsMove,
278 move_result<_Iter, _Out>,
279 copy_result<_Iter, _Out>>
280 __copy_or_move(_Iter __first, _Sent __last, _Out __result)
284 using __detail::__is_move_iterator;
285 using __detail::__is_reverse_iterator;
286 using __detail::__is_normal_iterator;
287 if constexpr (__is_move_iterator<_Iter> && same_as<_Iter, _Sent>)
290 = ranges::__copy_or_move<true>(
std::move(__first).base(),
295 else if constexpr (__is_reverse_iterator<_Iter> && same_as<_Iter, _Sent>
296 && __is_reverse_iterator<_Out>)
299 = ranges::__copy_or_move_backward<_IsMove>(
std::move(__last).base(),
302 return {reverse_iterator{
std::move(__in)},
305 else if constexpr (__is_normal_iterator<_Iter> && same_as<_Iter, _Sent>)
308 = ranges::__copy_or_move<_IsMove>(__first.base(), __last.base(),
310 return {
decltype(__first){__in},
std::move(__out)};
312 else if constexpr (__is_normal_iterator<_Out>)
315 = ranges::__copy_or_move<_IsMove>(
std::move(__first), __last, __result.base());
316 return {
std::move(__in),
decltype(__result){__out}};
318 else if constexpr (sized_sentinel_for<_Sent, _Iter>)
320 if (!std::__is_constant_evaluated())
322 if constexpr (__memcpyable<_Out, _Iter>::__value)
324 using _ValueTypeI = iter_value_t<_Iter>;
325 auto __num = __last - __first;
326 if (__num > 1) [[likely]]
327 __builtin_memmove(__result, __first,
328 sizeof(_ValueTypeI) * __num);
330 __detail::__assign_one<_IsMove>(__result, __first);
331 return {__first + __num, __result + __num};
335 for (
auto __n = __last - __first; __n > 0; --__n)
337 __detail::__assign_one<_IsMove>(__result, __first);
345 while (__first != __last)
347 __detail::__assign_one<_IsMove>(__result, __first);
357 template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
358 weakly_incrementable _Out>
359 requires indirectly_copyable<_Iter, _Out>
360 constexpr copy_result<_Iter, _Out>
361 operator()(_Iter __first, _Sent __last, _Out __result)
const
363 return ranges::__copy_or_move<false>(
std::move(__first),
368 template<input_range _Range, weakly_incrementable _Out>
369 requires indirectly_copyable<iterator_t<_Range>, _Out>
370 constexpr copy_result<borrowed_iterator_t<_Range>, _Out>
371 operator()(_Range&& __r, _Out __result)
const
373 return (*
this)(ranges::begin(__r), ranges::end(__r),
378 inline constexpr __copy_fn copy{};
382 template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
383 weakly_incrementable _Out>
384 requires indirectly_movable<_Iter, _Out>
385 constexpr move_result<_Iter, _Out>
386 operator()(_Iter __first, _Sent __last, _Out __result)
const
388 return ranges::__copy_or_move<true>(
std::move(__first),
393 template<input_range _Range, weakly_incrementable _Out>
394 requires indirectly_movable<iterator_t<_Range>, _Out>
395 constexpr move_result<borrowed_iterator_t<_Range>, _Out>
396 operator()(_Range&& __r, _Out __result)
const
398 return (*
this)(ranges::begin(__r), ranges::end(__r),
403 inline constexpr __move_fn move{};
405 template<
bool _IsMove,
406 bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent,
407 bidirectional_iterator _Out>
409 ? indirectly_movable<_Iter, _Out>
410 : indirectly_copyable<_Iter, _Out>)
411 constexpr __conditional_t<_IsMove,
412 move_backward_result<_Iter, _Out>,
413 copy_backward_result<_Iter, _Out>>
414 __copy_or_move_backward(_Iter __first, _Sent __last, _Out __result)
418 using __detail::__is_reverse_iterator;
419 using __detail::__is_normal_iterator;
420 if constexpr (__is_reverse_iterator<_Iter> && same_as<_Iter, _Sent>
421 && __is_reverse_iterator<_Out>)
424 = ranges::__copy_or_move<_IsMove>(
std::move(__last).base(),
427 return {reverse_iterator{
std::move(__in)},
430 else if constexpr (__is_normal_iterator<_Iter> && same_as<_Iter, _Sent>)
433 = ranges::__copy_or_move_backward<_IsMove>(__first.base(),
436 return {
decltype(__first){__in},
std::move(__out)};
438 else if constexpr (__is_normal_iterator<_Out>)
441 = ranges::__copy_or_move_backward<_IsMove>(
std::move(__first),
444 return {
std::move(__in),
decltype(__result){__out}};
446 else if constexpr (sized_sentinel_for<_Sent, _Iter>)
448 if (!std::__is_constant_evaluated())
450 if constexpr (__memcpyable<_Out, _Iter>::__value)
452 using _ValueTypeI = iter_value_t<_Iter>;
453 auto __num = __last - __first;
455 if (__num > 1) [[likely]]
456 __builtin_memmove(__result, __first,
457 sizeof(_ValueTypeI) * __num);
459 __detail::__assign_one<_IsMove>(__result, __first);
460 return {__first + __num, __result};
464 auto __lasti = ranges::next(__first, __last);
465 auto __tail = __lasti;
467 for (
auto __n = __last - __first; __n > 0; --__n)
471 __detail::__assign_one<_IsMove>(__result, __tail);
477 auto __lasti = ranges::next(__first, __last);
478 auto __tail = __lasti;
480 while (__first != __tail)
484 __detail::__assign_one<_IsMove>(__result, __tail);
490 struct __copy_backward_fn
492 template<b
idirectional_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
493 b
idirectional_iterator _Iter2>
494 requires indirectly_copyable<_Iter1, _Iter2>
495 constexpr copy_backward_result<_Iter1, _Iter2>
496 operator()(_Iter1 __first, _Sent1 __last, _Iter2 __result)
const
498 return ranges::__copy_or_move_backward<false>(
std::move(__first),
503 template<b
idirectional_range _Range, b
idirectional_iterator _Iter>
504 requires indirectly_copyable<iterator_t<_Range>, _Iter>
505 constexpr copy_backward_result<borrowed_iterator_t<_Range>, _Iter>
506 operator()(_Range&& __r, _Iter __result)
const
508 return (*
this)(ranges::begin(__r), ranges::end(__r),
513 inline constexpr __copy_backward_fn copy_backward{};
515 struct __move_backward_fn
517 template<b
idirectional_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
518 b
idirectional_iterator _Iter2>
519 requires indirectly_movable<_Iter1, _Iter2>
520 constexpr move_backward_result<_Iter1, _Iter2>
521 operator()(_Iter1 __first, _Sent1 __last, _Iter2 __result)
const
523 return ranges::__copy_or_move_backward<true>(
std::move(__first),
528 template<b
idirectional_range _Range, b
idirectional_iterator _Iter>
529 requires indirectly_movable<iterator_t<_Range>, _Iter>
530 constexpr move_backward_result<borrowed_iterator_t<_Range>, _Iter>
531 operator()(_Range&& __r, _Iter __result)
const
533 return (*
this)(ranges::begin(__r), ranges::end(__r),
538 inline constexpr __move_backward_fn move_backward{};
540 template<
typename _Iter,
typename _Out>
541 using copy_n_result = in_out_result<_Iter, _Out>;
545 template<input_iterator _Iter, weakly_incrementable _Out>
546 requires indirectly_copyable<_Iter, _Out>
547 constexpr copy_n_result<_Iter, _Out>
548 operator()(_Iter __first, iter_difference_t<_Iter> __n,
551 if constexpr (random_access_iterator<_Iter>)
554 return ranges::copy(__first, __first + __n,
std::move(__result));
558 for (; __n > 0; --__n, (void)++__result, (
void)++__first)
559 *__result = *__first;
565 inline constexpr __copy_n_fn copy_n{};
569 template<
typename _Tp, output_iterator<const _Tp&> _Out>
571 operator()(_Out __first, iter_difference_t<_Out> __n,
572 const _Tp& __value)
const
579 if constexpr (is_scalar_v<_Tp>)
582 if constexpr (is_pointer_v<_Out>
584 && __is_byte<remove_pointer_t<_Out>>::__value
587 if (!std::__is_constant_evaluated())
589 __builtin_memset(__first,
590 static_cast<unsigned char>(__value),
592 return __first + __n;
596 const auto __tmp = __value;
597 for (; __n > 0; --__n, (void)++__first)
603 for (; __n > 0; --__n, (void)++__first)
610 inline constexpr __fill_n_fn fill_n{};
614 template<
typename _Tp,
615 output_iterator<const _Tp&> _Out, sentinel_for<_Out> _Sent>
617 operator()(_Out __first, _Sent __last,
const _Tp& __value)
const
621 if constexpr (sized_sentinel_for<_Sent, _Out>)
623 const auto __len = __last - __first;
624 return ranges::fill_n(
std::move(__first), __len, __value);
626 else if constexpr (is_scalar_v<_Tp>)
628 const auto __tmp = __value;
629 for (; __first != __last; ++__first)
635 for (; __first != __last; ++__first)
641 template<
typename _Tp, output_range<const _Tp&> _Range>
642 constexpr borrowed_iterator_t<_Range>
643 operator()(_Range&& __r,
const _Tp& __value)
const
645 return (*
this)(ranges::begin(__r), ranges::end(__r), __value);
649 inline constexpr __fill_fn fill{};
651_GLIBCXX_END_NAMESPACE_VERSION
constexpr std::remove_reference< _Tp >::type && move(_Tp &&__t) noexcept
Convert a value to an rvalue.
constexpr __invoke_result< _Callable, _Args... >::type __invoke(_Callable &&__fn, _Args &&... __args) noexcept(__is_nothrow_invocable< _Callable, _Args... >::value)
Invoke a callable object.
ISO C++ entities toplevel namespace is std.