30 #ifndef _RANGES_ALGOBASE_H
31 #define _RANGES_ALGOBASE_H 1
33 #if __cplusplus > 201703L
42 #if __cpp_lib_concepts
43 namespace std _GLIBCXX_VISIBILITY(default)
45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
50 template<
typename _Tp>
51 constexpr
inline bool __is_normal_iterator =
false;
53 template<
typename _Iterator,
typename _Container>
55 __is_normal_iterator<__gnu_cxx::__normal_iterator<_Iterator,
58 template<
typename _Tp>
59 constexpr
inline bool __is_reverse_iterator =
false;
61 template<
typename _Iterator>
63 __is_reverse_iterator<reverse_iterator<_Iterator>> =
true;
65 template<
typename _Tp>
66 constexpr
inline bool __is_move_iterator =
false;
68 template<
typename _Iterator>
70 __is_move_iterator<move_iterator<_Iterator>> =
true;
75 template<input_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
76 input_iterator _Iter2, sentinel_for<_Iter2> _Sent2,
77 typename _Pred = ranges::equal_to,
78 typename _Proj1 =
identity,
typename _Proj2 =
identity>
79 requires indirectly_comparable<_Iter1, _Iter2, _Pred, _Proj1, _Proj2>
81 operator()(_Iter1 __first1, _Sent1 __last1,
82 _Iter2 __first2, _Sent2 __last2, _Pred __pred = {},
83 _Proj1 __proj1 = {}, _Proj2 __proj2 = {})
const
87 if constexpr (__detail::__is_normal_iterator<_Iter1>
88 || __detail::__is_normal_iterator<_Iter2>)
89 return (*
this)(std::__niter_base(
std::move(__first1)),
95 else if constexpr (sized_sentinel_for<_Sent1, _Iter1>
96 && sized_sentinel_for<_Sent2, _Iter2>)
103 using _ValueType1 = iter_value_t<_Iter1>;
104 using _ValueType2 = iter_value_t<_Iter2>;
105 constexpr
bool __use_memcmp
106 = ((is_integral_v<_ValueType1> || is_pointer_v<_ValueType1>)
107 && is_same_v<_ValueType1, _ValueType2>
108 && is_pointer_v<_Iter1>
109 && is_pointer_v<_Iter2>
110 && is_same_v<_Pred, ranges::equal_to>
111 && is_same_v<_Proj1, identity>
112 && is_same_v<_Proj2, identity>);
113 if constexpr (__use_memcmp)
115 if (
const size_t __len = (__last1 - __first1))
116 return !std::__memcmp(__first1, __first2, __len);
121 for (; __first1 != __last1; ++__first1, (void)++__first2)
131 for (; __first1 != __last1 && __first2 != __last2;
132 ++__first1, (void)++__first2)
137 return __first1 == __last1 && __first2 == __last2;
141 template<input_range _Range1, input_range _Range2,
142 typename _Pred = ranges::equal_to,
143 typename _Proj1 = identity,
typename _Proj2 = identity>
144 requires indirectly_comparable<iterator_t<_Range1>, iterator_t<_Range2>,
145 _Pred, _Proj1, _Proj2>
147 operator()(_Range1&& __r1, _Range2&& __r2, _Pred __pred = {},
148 _Proj1 __proj1 = {}, _Proj2 __proj2 = {})
const
157 inline constexpr __equal_fn equal{};
159 template<
typename _Iter,
typename _Out>
162 [[no_unique_address]] _Iter in;
163 [[no_unique_address]] _Out out;
165 template<
typename _Iter2,
typename _Out2>
166 requires convertible_to<const _Iter&, _Iter2>
167 && convertible_to<const _Out&, _Out2>
169 operator in_out_result<_Iter2, _Out2>() const &
170 {
return {in, out}; }
172 template<
typename _Iter2,
typename _Out2>
173 requires convertible_to<_Iter, _Iter2>
174 && convertible_to<_Out, _Out2>
176 operator in_out_result<_Iter2, _Out2>() &&
180 template<
typename _Iter,
typename _Out>
181 using copy_result = in_out_result<_Iter, _Out>;
183 template<
typename _Iter,
typename _Out>
184 using move_result = in_out_result<_Iter, _Out>;
186 template<
typename _Iter1,
typename _Iter2>
187 using move_backward_result = in_out_result<_Iter1, _Iter2>;
189 template<
typename _Iter1,
typename _Iter2>
190 using copy_backward_result = in_out_result<_Iter1, _Iter2>;
192 template<
bool _IsMove,
193 bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent,
194 bidirectional_iterator _Out>
196 ? indirectly_movable<_Iter, _Out>
197 : indirectly_copyable<_Iter, _Out>)
199 move_backward_result<_Iter, _Out>,
200 copy_backward_result<_Iter, _Out>>
201 __copy_or_move_backward(_Iter __first, _Sent __last, _Out __result);
203 template<
bool _IsMove,
204 input_iterator _Iter, sentinel_for<_Iter> _Sent,
205 weakly_incrementable _Out>
207 ? indirectly_movable<_Iter, _Out>
208 : indirectly_copyable<_Iter, _Out>)
210 move_result<_Iter, _Out>,
211 copy_result<_Iter, _Out>>
212 __copy_or_move(_Iter __first, _Sent __last, _Out __result)
216 constexpr
bool __normal_iterator_p
217 = (__detail::__is_normal_iterator<_Iter>
218 || __detail::__is_normal_iterator<_Out>);
219 constexpr
bool __reverse_p
220 = (__detail::__is_reverse_iterator<_Iter>
221 && __detail::__is_reverse_iterator<_Out>);
222 constexpr
bool __move_iterator_p = __detail::__is_move_iterator<_Iter>;
223 if constexpr (__move_iterator_p)
226 = ranges::__copy_or_move<true>(
std::move(__first).base(),
231 else if constexpr (__reverse_p)
234 = ranges::__copy_or_move_backward<_IsMove>(__last.base(),
237 return {reverse_iterator{
std::move(__in)},
240 else if constexpr (__normal_iterator_p)
243 = ranges::__copy_or_move<_IsMove>(std::__niter_base(__first),
244 std::__niter_base(__last),
245 std::__niter_base(__result));
246 return {std::__niter_wrap(__first,
std::move(__in)),
247 std::__niter_wrap(__result,
std::move(__out))};
249 else if constexpr (sized_sentinel_for<_Sent, _Iter>)
251 #ifdef __cpp_lib_is_constant_evaluated
252 if (!std::is_constant_evaluated())
255 using _ValueTypeI = iter_value_t<_Iter>;
256 using _ValueTypeO =
typename iterator_traits<_Out>::value_type;
257 constexpr
bool __use_memmove
258 = (is_trivially_copyable_v<_ValueTypeI>
259 && is_same_v<_ValueTypeI, _ValueTypeO>
260 && is_pointer_v<_Iter>
261 && is_pointer_v<_Out>);
263 if constexpr (__use_memmove)
265 static_assert(_IsMove
266 ? is_move_assignable_v<_ValueTypeI>
267 : is_copy_assignable_v<_ValueTypeI>);
268 auto __num = __last - __first;
270 __builtin_memmove(__result, __first,
271 sizeof(_ValueTypeI) * __num);
272 return {__first + __num, __result + __num};
276 for (
auto __n = __last - __first; __n > 0; --__n)
278 if constexpr (_IsMove)
281 *__result = *__first;
289 while (__first != __last)
291 if constexpr (_IsMove)
294 *__result = *__first;
304 template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
305 weakly_incrementable _Out>
306 requires indirectly_copyable<_Iter, _Out>
307 constexpr copy_result<_Iter, _Out>
308 operator()(_Iter __first, _Sent __last, _Out __result)
const
310 return ranges::__copy_or_move<false>(
std::move(__first),
315 template<input_range _Range, weakly_incrementable _Out>
316 requires indirectly_copyable<iterator_t<_Range>, _Out>
317 constexpr copy_result<borrowed_iterator_t<_Range>, _Out>
318 operator()(_Range&& __r, _Out __result)
const
325 inline constexpr __copy_fn copy{};
329 template<input_iterator _Iter, sentinel_for<_Iter> _Sent,
330 weakly_incrementable _Out>
331 requires indirectly_movable<_Iter, _Out>
332 constexpr move_result<_Iter, _Out>
333 operator()(_Iter __first, _Sent __last, _Out __result)
const
335 return ranges::__copy_or_move<true>(
std::move(__first),
340 template<input_range _Range, weakly_incrementable _Out>
341 requires indirectly_movable<iterator_t<_Range>, _Out>
342 constexpr move_result<borrowed_iterator_t<_Range>, _Out>
343 operator()(_Range&& __r, _Out __result)
const
350 inline constexpr __move_fn
move{};
352 template<
bool _IsMove,
353 bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent,
354 bidirectional_iterator _Out>
356 ? indirectly_movable<_Iter, _Out>
357 : indirectly_copyable<_Iter, _Out>)
359 move_backward_result<_Iter, _Out>,
360 copy_backward_result<_Iter, _Out>>
361 __copy_or_move_backward(_Iter __first, _Sent __last, _Out __result)
365 constexpr
bool __normal_iterator_p
366 = (__detail::__is_normal_iterator<_Iter>
367 || __detail::__is_normal_iterator<_Out>);
368 constexpr
bool __reverse_p
369 = (__detail::__is_reverse_iterator<_Iter>
370 && __detail::__is_reverse_iterator<_Out>);
371 if constexpr (__reverse_p)
374 = ranges::__copy_or_move<_IsMove>(__last.base(),
377 return {reverse_iterator{
std::move(__in)},
380 else if constexpr (__normal_iterator_p)
383 = ranges::__copy_or_move_backward<_IsMove>
384 (std::__niter_base(__first),
385 std::__niter_base(__last),
386 std::__niter_base(__result));
387 return {std::__niter_wrap(__first,
std::move(__in)),
388 std::__niter_wrap(__result,
std::move(__out))};
390 else if constexpr (sized_sentinel_for<_Sent, _Iter>)
392 #ifdef __cpp_lib_is_constant_evaluated
393 if (!std::is_constant_evaluated())
396 using _ValueTypeI = iter_value_t<_Iter>;
397 using _ValueTypeO =
typename iterator_traits<_Out>::value_type;
398 constexpr
bool __use_memmove
399 = (is_trivially_copyable_v<_ValueTypeI>
400 && is_same_v<_ValueTypeI, _ValueTypeO>
401 && is_pointer_v<_Iter>
402 && is_pointer_v<_Out>);
403 if constexpr (__use_memmove)
405 static_assert(_IsMove
406 ? is_move_assignable_v<_ValueTypeI>
407 : is_copy_assignable_v<_ValueTypeI>);
408 auto __num = __last - __first;
410 __builtin_memmove(__result - __num, __first,
411 sizeof(_ValueTypeI) * __num);
412 return {__first + __num, __result - __num};
416 auto __lasti = ranges::next(__first, __last);
417 auto __tail = __lasti;
419 for (
auto __n = __last - __first; __n > 0; --__n)
423 if constexpr (_IsMove)
432 auto __lasti = ranges::next(__first, __last);
433 auto __tail = __lasti;
435 while (__first != __tail)
439 if constexpr (_IsMove)
448 struct __copy_backward_fn
450 template<b
idirectional_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
451 b
idirectional_iterator _Iter2>
452 requires indirectly_copyable<_Iter1, _Iter2>
453 constexpr copy_backward_result<_Iter1, _Iter2>
454 operator()(_Iter1 __first, _Sent1 __last, _Iter2 __result)
const
456 return ranges::__copy_or_move_backward<false>(
std::move(__first),
461 template<b
idirectional_range _Range, b
idirectional_iterator _Iter>
462 requires indirectly_copyable<iterator_t<_Range>, _Iter>
463 constexpr copy_backward_result<borrowed_iterator_t<_Range>, _Iter>
464 operator()(_Range&& __r, _Iter __result)
const
471 inline constexpr __copy_backward_fn copy_backward{};
473 struct __move_backward_fn
475 template<b
idirectional_iterator _Iter1, sentinel_for<_Iter1> _Sent1,
476 b
idirectional_iterator _Iter2>
477 requires indirectly_movable<_Iter1, _Iter2>
478 constexpr move_backward_result<_Iter1, _Iter2>
479 operator()(_Iter1 __first, _Sent1 __last, _Iter2 __result)
const
481 return ranges::__copy_or_move_backward<true>(
std::move(__first),
486 template<b
idirectional_range _Range, b
idirectional_iterator _Iter>
487 requires indirectly_movable<iterator_t<_Range>, _Iter>
488 constexpr move_backward_result<borrowed_iterator_t<_Range>, _Iter>
489 operator()(_Range&& __r, _Iter __result)
const
498 template<
typename _Iter,
typename _Out>
499 using copy_n_result = in_out_result<_Iter, _Out>;
503 template<input_iterator _Iter, weakly_incrementable _Out>
504 requires indirectly_copyable<_Iter, _Out>
505 constexpr copy_n_result<_Iter, _Out>
506 operator()(_Iter __first, iter_difference_t<_Iter> __n,
509 if constexpr (random_access_iterator<_Iter>)
510 return ranges::copy(__first, __first + __n,
std::move(__result));
513 for (; __n > 0; --__n, (void)++__result, (
void)++__first)
514 *__result = *__first;
520 inline constexpr __copy_n_fn copy_n{};
524 template<
typename _Tp, output_iterator<const _Tp&> _Out>
526 operator()(_Out __first, iter_difference_t<_Out> __n,
527 const _Tp& __value)
const
535 if constexpr (is_pointer_v<_Out> && __is_byte<_Tp>::__value)
537 __builtin_memset(__first, static_cast<unsigned char>(__value), __n);
538 return __first + __n;
540 else if constexpr (is_scalar_v<_Tp>)
542 const auto __tmp = __value;
543 for (; __n > 0; --__n, (void)++__first)
549 for (; __n > 0; --__n, (void)++__first)
556 inline constexpr __fill_n_fn fill_n{};
560 template<
typename _Tp,
561 output_iterator<const _Tp&> _Out, sentinel_for<_Out> _Sent>
563 operator()(_Out __first, _Sent __last,
const _Tp& __value)
const
567 if constexpr (sized_sentinel_for<_Sent, _Out>)
569 const auto __len = __last - __first;
570 return ranges::fill_n(__first, __len, __value);
572 else if constexpr (is_scalar_v<_Tp>)
574 const auto __tmp = __value;
575 for (; __first != __last; ++__first)
581 for (; __first != __last; ++__first)
587 template<
typename _Tp, output_range<const _Tp&> _Range>
588 constexpr borrowed_iterator_t<_Range>
589 operator()(_Range&& __r,
const _Tp& __value)
const
595 inline constexpr __fill_fn fill{};
597 _GLIBCXX_END_NAMESPACE_VERSION
601 #endif // _RANGES_ALGOBASE_H