37 changes: 37 additions & 0 deletions libcxx/include/__cxx03/__algorithm/is_partitioned.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_IS_PARTITIONED_H
#define _LIBCPP___ALGORITHM_IS_PARTITIONED_H

#include <__config>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _InputIterator, class _Predicate>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
is_partitioned(_InputIterator __first, _InputIterator __last, _Predicate __pred) {
for (; __first != __last; ++__first)
if (!__pred(*__first))
break;
if (__first == __last)
return true;
++__first;
for (; __first != __last; ++__first)
if (__pred(*__first))
return false;
return true;
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_IS_PARTITIONED_H
308 changes: 308 additions & 0 deletions libcxx/include/__cxx03/__algorithm/is_permutation.h
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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_IS_PERMUTATION_H
#define _LIBCPP___ALGORITHM_IS_PERMUTATION_H

#include <__algorithm/comp.h>
#include <__algorithm/iterator_operations.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__iterator/concepts.h>
#include <__iterator/distance.h>
#include <__iterator/iterator_traits.h>
#include <__iterator/next.h>
#include <__type_traits/is_callable.h>
#include <__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class = void>
struct _ConstTimeDistance : false_type {};

#if _LIBCPP_STD_VER >= 20

template <class _Iter1, class _Sent1, class _Iter2, class _Sent2>
struct _ConstTimeDistance<_Iter1,
_Sent1,
_Iter2,
_Sent2,
__enable_if_t< sized_sentinel_for<_Sent1, _Iter1> && sized_sentinel_for<_Sent2, _Iter2> >>
: true_type {};

#else

template <class _Iter1, class _Iter2>
struct _ConstTimeDistance<
_Iter1,
_Iter1,
_Iter2,
_Iter2,
__enable_if_t< is_same<typename iterator_traits<_Iter1>::iterator_category, random_access_iterator_tag>::value &&
is_same<typename iterator_traits<_Iter2>::iterator_category, random_access_iterator_tag>::value > >
: true_type {};

#endif // _LIBCPP_STD_VER >= 20

// Internal functions

// For each element in [f1, l1) see if there are the same number of equal elements in [f2, l2)
template <class _AlgPolicy,
class _Iter1,
class _Sent1,
class _Iter2,
class _Sent2,
class _Proj1,
class _Proj2,
class _Pred>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __is_permutation_impl(
_Iter1 __first1,
_Sent1 __last1,
_Iter2 __first2,
_Sent2 __last2,
_Pred&& __pred,
_Proj1&& __proj1,
_Proj2&& __proj2) {
using _D1 = __iter_diff_t<_Iter1>;

for (auto __i = __first1; __i != __last1; ++__i) {
// Have we already counted the number of *__i in [f1, l1)?
auto __match = __first1;
for (; __match != __i; ++__match) {
if (std::__invoke(__pred, std::__invoke(__proj1, *__match), std::__invoke(__proj1, *__i)))
break;
}

if (__match == __i) {
// Count number of *__i in [f2, l2)
_D1 __c2 = 0;
for (auto __j = __first2; __j != __last2; ++__j) {
if (std::__invoke(__pred, std::__invoke(__proj1, *__i), std::__invoke(__proj2, *__j)))
++__c2;
}
if (__c2 == 0)
return false;

// Count number of *__i in [__i, l1) (we can start with 1)
_D1 __c1 = 1;
for (auto __j = _IterOps<_AlgPolicy>::next(__i); __j != __last1; ++__j) {
if (std::__invoke(__pred, std::__invoke(__proj1, *__i), std::__invoke(__proj1, *__j)))
++__c1;
}
if (__c1 != __c2)
return false;
}
}

return true;
}

// 2+1 iterators, predicate. Not used by range algorithms.
template <class _AlgPolicy, class _ForwardIterator1, class _Sentinel1, class _ForwardIterator2, class _BinaryPredicate>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __is_permutation(
_ForwardIterator1 __first1, _Sentinel1 __last1, _ForwardIterator2 __first2, _BinaryPredicate&& __pred) {
// Shorten sequences as much as possible by lopping of any equal prefix.
for (; __first1 != __last1; ++__first1, (void)++__first2) {
if (!__pred(*__first1, *__first2))
break;
}

if (__first1 == __last1)
return true;

// __first1 != __last1 && *__first1 != *__first2
using _D1 = __iter_diff_t<_ForwardIterator1>;
_D1 __l1 = _IterOps<_AlgPolicy>::distance(__first1, __last1);
if (__l1 == _D1(1))
return false;
auto __last2 = _IterOps<_AlgPolicy>::next(__first2, __l1);

return std::__is_permutation_impl<_AlgPolicy>(
std::move(__first1),
std::move(__last1),
std::move(__first2),
std::move(__last2),
__pred,
__identity(),
__identity());
}

// 2+2 iterators, predicate, non-constant time `distance`.
template <class _AlgPolicy,
class _Iter1,
class _Sent1,
class _Iter2,
class _Sent2,
class _Proj1,
class _Proj2,
class _Pred>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __is_permutation(
_Iter1 __first1,
_Sent1 __last1,
_Iter2 __first2,
_Sent2 __last2,
_Pred&& __pred,
_Proj1&& __proj1,
_Proj2&& __proj2,
/*_ConstTimeDistance=*/false_type) {
// Shorten sequences as much as possible by lopping of any equal prefix.
while (__first1 != __last1 && __first2 != __last2) {
if (!std::__invoke(__pred, std::__invoke(__proj1, *__first1), std::__invoke(__proj2, *__first2)))
break;
++__first1;
++__first2;
}

if (__first1 == __last1)
return __first2 == __last2;
if (__first2 == __last2) // Second range is shorter
return false;

using _D1 = __iter_diff_t<_Iter1>;
_D1 __l1 = _IterOps<_AlgPolicy>::distance(__first1, __last1);

using _D2 = __iter_diff_t<_Iter2>;
_D2 __l2 = _IterOps<_AlgPolicy>::distance(__first2, __last2);
if (__l1 != __l2)
return false;

return std::__is_permutation_impl<_AlgPolicy>(
std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __pred, __proj1, __proj2);
}

// 2+2 iterators, predicate, specialization for constant-time `distance` call.
template <class _AlgPolicy,
class _Iter1,
class _Sent1,
class _Iter2,
class _Sent2,
class _Proj1,
class _Proj2,
class _Pred>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __is_permutation(
_Iter1 __first1,
_Sent1 __last1,
_Iter2 __first2,
_Sent2 __last2,
_Pred&& __pred,
_Proj1&& __proj1,
_Proj2&& __proj2,
/*_ConstTimeDistance=*/true_type) {
if (std::distance(__first1, __last1) != std::distance(__first2, __last2))
return false;
return std::__is_permutation<_AlgPolicy>(
std::move(__first1),
std::move(__last1),
std::move(__first2),
std::move(__last2),
__pred,
__proj1,
__proj2,
/*_ConstTimeDistance=*/false_type());
}

// 2+2 iterators, predicate
template <class _AlgPolicy,
class _Iter1,
class _Sent1,
class _Iter2,
class _Sent2,
class _Proj1,
class _Proj2,
class _Pred>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __is_permutation(
_Iter1 __first1,
_Sent1 __last1,
_Iter2 __first2,
_Sent2 __last2,
_Pred&& __pred,
_Proj1&& __proj1,
_Proj2&& __proj2) {
return std::__is_permutation<_AlgPolicy>(
std::move(__first1),
std::move(__last1),
std::move(__first2),
std::move(__last2),
__pred,
__proj1,
__proj2,
_ConstTimeDistance<_Iter1, _Sent1, _Iter2, _Sent2>());
}

// Public interface

// 2+1 iterators, predicate
template <class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool is_permutation(
_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2, _BinaryPredicate __pred) {
static_assert(__is_callable<_BinaryPredicate, decltype(*__first1), decltype(*__first2)>::value,
"The predicate has to be callable");

return std::__is_permutation<_ClassicAlgPolicy>(std::move(__first1), std::move(__last1), std::move(__first2), __pred);
}

// 2+1 iterators
template <class _ForwardIterator1, class _ForwardIterator2>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
is_permutation(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2) {
return std::is_permutation(__first1, __last1, __first2, __equal_to());
}

#if _LIBCPP_STD_VER >= 14

// 2+2 iterators
template <class _ForwardIterator1, class _ForwardIterator2>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool is_permutation(
_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2, _ForwardIterator2 __last2) {
return std::__is_permutation<_ClassicAlgPolicy>(
std::move(__first1),
std::move(__last1),
std::move(__first2),
std::move(__last2),
__equal_to(),
__identity(),
__identity());
}

// 2+2 iterators, predicate
template <class _ForwardIterator1, class _ForwardIterator2, class _BinaryPredicate>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool is_permutation(
_ForwardIterator1 __first1,
_ForwardIterator1 __last1,
_ForwardIterator2 __first2,
_ForwardIterator2 __last2,
_BinaryPredicate __pred) {
static_assert(__is_callable<_BinaryPredicate, decltype(*__first1), decltype(*__first2)>::value,
"The predicate has to be callable");

return std::__is_permutation<_ClassicAlgPolicy>(
std::move(__first1),
std::move(__last1),
std::move(__first2),
std::move(__last2),
__pred,
__identity(),
__identity());
}

#endif // _LIBCPP_STD_VER >= 14

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_IS_PERMUTATION_H
38 changes: 38 additions & 0 deletions libcxx/include/__cxx03/__algorithm/is_sorted.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_IS_SORTED_H
#define _LIBCPP___ALGORITHM_IS_SORTED_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/is_sorted_until.h>
#include <__config>
#include <__iterator/iterator_traits.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _ForwardIterator, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
is_sorted(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) {
return std::__is_sorted_until<__comp_ref_type<_Compare> >(__first, __last, __comp) == __last;
}

template <class _ForwardIterator>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
is_sorted(_ForwardIterator __first, _ForwardIterator __last) {
return std::is_sorted(__first, __last, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_IS_SORTED_H
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_IS_SORTED_UNTIL_H
#define _LIBCPP___ALGORITHM_IS_SORTED_UNTIL_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__config>
#include <__iterator/iterator_traits.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Compare, class _ForwardIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
__is_sorted_until(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) {
if (__first != __last) {
_ForwardIterator __i = __first;
while (++__i != __last) {
if (__comp(*__i, *__first))
return __i;
__first = __i;
}
}
return __last;
}

template <class _ForwardIterator, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
is_sorted_until(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) {
return std::__is_sorted_until<__comp_ref_type<_Compare> >(__first, __last, __comp);
}

template <class _ForwardIterator>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
is_sorted_until(_ForwardIterator __first, _ForwardIterator __last) {
return std::is_sorted_until(__first, __last, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_IS_SORTED_UNTIL_H
31 changes: 31 additions & 0 deletions libcxx/include/__cxx03/__algorithm/iter_swap.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_ITER_SWAP_H
#define _LIBCPP___ALGORITHM_ITER_SWAP_H

#include <__config>
#include <__utility/declval.h>
#include <__utility/swap.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _ForwardIterator1, class _ForwardIterator2>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void iter_swap(_ForwardIterator1 __a, _ForwardIterator2 __b)
// _NOEXCEPT_(_NOEXCEPT_(swap(*__a, *__b)))
_NOEXCEPT_(_NOEXCEPT_(swap(*std::declval<_ForwardIterator1>(), *std::declval<_ForwardIterator2>()))) {
swap(*__a, *__b);
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_ITER_SWAP_H
223 changes: 223 additions & 0 deletions libcxx/include/__cxx03/__algorithm/iterator_operations.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_ITERATOR_OPERATIONS_H
#define _LIBCPP___ALGORITHM_ITERATOR_OPERATIONS_H

#include <__algorithm/iter_swap.h>
#include <__algorithm/ranges_iterator_concept.h>
#include <__assert>
#include <__config>
#include <__iterator/advance.h>
#include <__iterator/distance.h>
#include <__iterator/incrementable_traits.h>
#include <__iterator/iter_move.h>
#include <__iterator/iter_swap.h>
#include <__iterator/iterator_traits.h>
#include <__iterator/next.h>
#include <__iterator/prev.h>
#include <__iterator/readable_traits.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_reference.h>
#include <__type_traits/is_same.h>
#include <__type_traits/remove_cvref.h>
#include <__utility/declval.h>
#include <__utility/forward.h>
#include <__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _AlgPolicy>
struct _IterOps;

#if _LIBCPP_STD_VER >= 20
struct _RangeAlgPolicy {};

template <>
struct _IterOps<_RangeAlgPolicy> {
template <class _Iter>
using __value_type = iter_value_t<_Iter>;

template <class _Iter>
using __iterator_category = ranges::__iterator_concept<_Iter>;

template <class _Iter>
using __difference_type = iter_difference_t<_Iter>;

static constexpr auto advance = ranges::advance;
static constexpr auto distance = ranges::distance;
static constexpr auto __iter_move = ranges::iter_move;
static constexpr auto iter_swap = ranges::iter_swap;
static constexpr auto next = ranges::next;
static constexpr auto prev = ranges::prev;
static constexpr auto __advance_to = ranges::advance;
};

#endif

struct _ClassicAlgPolicy {};

template <>
struct _IterOps<_ClassicAlgPolicy> {
template <class _Iter>
using __value_type = typename iterator_traits<_Iter>::value_type;

template <class _Iter>
using __iterator_category = typename iterator_traits<_Iter>::iterator_category;

template <class _Iter>
using __difference_type = typename iterator_traits<_Iter>::difference_type;

// advance
template <class _Iter, class _Distance>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static void advance(_Iter& __iter, _Distance __count) {
std::advance(__iter, __count);
}

// distance
template <class _Iter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static typename iterator_traits<_Iter>::difference_type
distance(_Iter __first, _Iter __last) {
return std::distance(__first, __last);
}

template <class _Iter>
using __deref_t = decltype(*std::declval<_Iter&>());

template <class _Iter>
using __move_t = decltype(std::move(*std::declval<_Iter&>()));

template <class _Iter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static void __validate_iter_reference() {
static_assert(
is_same<__deref_t<_Iter>, typename iterator_traits<__remove_cvref_t<_Iter> >::reference>::value,
"It looks like your iterator's `iterator_traits<It>::reference` does not match the return type of "
"dereferencing the iterator, i.e., calling `*it`. This is undefined behavior according to [input.iterators] "
"and can lead to dangling reference issues at runtime, so we are flagging this.");
}

// iter_move
template <class _Iter, __enable_if_t<is_reference<__deref_t<_Iter> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static
// If the result of dereferencing `_Iter` is a reference type, deduce the result of calling `std::move` on it.
// Note that the C++03 mode doesn't support `decltype(auto)` as the return type.
__move_t<_Iter>
__iter_move(_Iter&& __i) {
__validate_iter_reference<_Iter>();

return std::move(*std::forward<_Iter>(__i));
}

template <class _Iter, __enable_if_t<!is_reference<__deref_t<_Iter> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static
// If the result of dereferencing `_Iter` is a value type, deduce the return value of this function to also be a
// value -- otherwise, after `operator*` returns a temporary, this function would return a dangling reference to
// that temporary. Note that the C++03 mode doesn't support `auto` as the return type.
__deref_t<_Iter>
__iter_move(_Iter&& __i) {
__validate_iter_reference<_Iter>();

return *std::forward<_Iter>(__i);
}

// iter_swap
template <class _Iter1, class _Iter2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static void iter_swap(_Iter1&& __a, _Iter2&& __b) {
std::iter_swap(std::forward<_Iter1>(__a), std::forward<_Iter2>(__b));
}

// next
template <class _Iterator>
_LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX14 _Iterator next(_Iterator, _Iterator __last) {
return __last;
}

template <class _Iter>
_LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX14 __remove_cvref_t<_Iter>
next(_Iter&& __it, typename iterator_traits<__remove_cvref_t<_Iter> >::difference_type __n = 1) {
return std::next(std::forward<_Iter>(__it), __n);
}

// prev
template <class _Iter>
_LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX14 __remove_cvref_t<_Iter>
prev(_Iter&& __iter, typename iterator_traits<__remove_cvref_t<_Iter> >::difference_type __n = 1) {
return std::prev(std::forward<_Iter>(__iter), __n);
}

template <class _Iter>
_LIBCPP_HIDE_FROM_ABI static _LIBCPP_CONSTEXPR_SINCE_CXX14 void __advance_to(_Iter& __first, _Iter __last) {
__first = __last;
}

// advance with sentinel, a la std::ranges::advance
template <class _Iter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static __difference_type<_Iter>
__advance_to(_Iter& __iter, __difference_type<_Iter> __count, const _Iter& __sentinel) {
return _IterOps::__advance_to(__iter, __count, __sentinel, typename iterator_traits<_Iter>::iterator_category());
}

private:
// advance with sentinel, a la std::ranges::advance -- InputIterator specialization
template <class _InputIter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static __difference_type<_InputIter> __advance_to(
_InputIter& __iter, __difference_type<_InputIter> __count, const _InputIter& __sentinel, input_iterator_tag) {
__difference_type<_InputIter> __dist = 0;
for (; __dist < __count && __iter != __sentinel; ++__dist)
++__iter;
return __count - __dist;
}

// advance with sentinel, a la std::ranges::advance -- BidirectionalIterator specialization
template <class _BiDirIter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static __difference_type<_BiDirIter>
__advance_to(_BiDirIter& __iter,
__difference_type<_BiDirIter> __count,
const _BiDirIter& __sentinel,
bidirectional_iterator_tag) {
__difference_type<_BiDirIter> __dist = 0;
if (__count >= 0)
for (; __dist < __count && __iter != __sentinel; ++__dist)
++__iter;
else
for (__count = -__count; __dist < __count && __iter != __sentinel; ++__dist)
--__iter;
return __count - __dist;
}

// advance with sentinel, a la std::ranges::advance -- RandomIterator specialization
template <class _RandIter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 static __difference_type<_RandIter>
__advance_to(_RandIter& __iter,
__difference_type<_RandIter> __count,
const _RandIter& __sentinel,
random_access_iterator_tag) {
auto __dist = _IterOps::distance(__iter, __sentinel);
_LIBCPP_ASSERT_VALID_INPUT_RANGE(
__count == 0 || (__dist < 0) == (__count < 0), "__sentinel must precede __iter when __count < 0");
if (__count < 0)
__dist = __dist > __count ? __dist : __count;
else
__dist = __dist < __count ? __dist : __count;
__iter += __dist;
return __count - __dist;
}
};

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_ITERATOR_OPERATIONS_H
57 changes: 57 additions & 0 deletions libcxx/include/__cxx03/__algorithm/lexicographical_compare.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_H
#define _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__config>
#include <__iterator/iterator_traits.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Compare, class _InputIterator1, class _InputIterator2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool __lexicographical_compare(
_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
_Compare __comp) {
for (; __first2 != __last2; ++__first1, (void)++__first2) {
if (__first1 == __last1 || __comp(*__first1, *__first2))
return true;
if (__comp(*__first2, *__first1))
return false;
}
return false;
}

template <class _InputIterator1, class _InputIterator2, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool lexicographical_compare(
_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
_Compare __comp) {
return std::__lexicographical_compare<__comp_ref_type<_Compare> >(__first1, __last1, __first2, __last2, __comp);
}

template <class _InputIterator1, class _InputIterator2>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool lexicographical_compare(
_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) {
return std::lexicographical_compare(__first1, __last1, __first2, __last2, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_H
125 changes: 125 additions & 0 deletions libcxx/include/__cxx03/__algorithm/lexicographical_compare_three_way.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_THREE_WAY_H
#define _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_THREE_WAY_H

#include <__algorithm/min.h>
#include <__algorithm/three_way_comp_ref_type.h>
#include <__compare/compare_three_way.h>
#include <__compare/ordering.h>
#include <__concepts/arithmetic.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__type_traits/common_type.h>
#include <__type_traits/is_constructible.h>
#include <__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

#if _LIBCPP_STD_VER >= 20

// Fast path for random access iterators which computes the number of loop iterations up-front and
// then skips the iterator comparisons inside the loop.
template <class _InputIterator1, class _InputIterator2, class _Cmp>
_LIBCPP_HIDE_FROM_ABI constexpr auto __lexicographical_compare_three_way_fast_path(
_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, _Cmp& __comp)
-> decltype(__comp(*__first1, *__first2)) {
static_assert(
signed_integral<__iter_diff_t<_InputIterator1>>, "Using a non-integral difference_type is undefined behavior.");
static_assert(
signed_integral<__iter_diff_t<_InputIterator2>>, "Using a non-integral difference_type is undefined behavior.");

using _Len1 = __iter_diff_t<_InputIterator1>;
using _Len2 = __iter_diff_t<_InputIterator2>;
using _Common = common_type_t<_Len1, _Len2>;

_Len1 __len1 = __last1 - __first1;
_Len2 __len2 = __last2 - __first2;
_Common __min_len = std::min<_Common>(__len1, __len2);

for (_Common __i = 0; __i < __min_len; ++__i) {
auto __c = __comp(*__first1, *__first2);
if (__c != 0) {
return __c;
}
++__first1;
++__first2;
}

return __len1 <=> __len2;
}

// Unoptimized implementation which compares the iterators against the end in every loop iteration
template <class _InputIterator1, class _InputIterator2, class _Cmp>
_LIBCPP_HIDE_FROM_ABI constexpr auto __lexicographical_compare_three_way_slow_path(
_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, _Cmp& __comp)
-> decltype(__comp(*__first1, *__first2)) {
while (true) {
bool __exhausted1 = __first1 == __last1;
bool __exhausted2 = __first2 == __last2;

if (__exhausted1 || __exhausted2) {
if (!__exhausted1)
return strong_ordering::greater;
if (!__exhausted2)
return strong_ordering::less;
return strong_ordering::equal;
}

auto __c = __comp(*__first1, *__first2);
if (__c != 0) {
return __c;
}

++__first1;
++__first2;
}
}

template <class _InputIterator1, class _InputIterator2, class _Cmp>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto lexicographical_compare_three_way(
_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2, _Cmp __comp)
-> decltype(__comp(*__first1, *__first2)) {
static_assert(__comparison_category<decltype(__comp(*__first1, *__first2))>,
"The comparator passed to lexicographical_compare_three_way must return a comparison category type.");
static_assert(std::is_copy_constructible_v<_InputIterator1>, "Iterators must be copy constructible.");
static_assert(std::is_copy_constructible_v<_InputIterator2>, "Iterators must be copy constructible.");
__three_way_comp_ref_type<_Cmp> __wrapped_comp_ref(__comp);
if constexpr (__has_random_access_iterator_category<_InputIterator1>::value &&
__has_random_access_iterator_category<_InputIterator2>::value) {
return std::__lexicographical_compare_three_way_fast_path(
std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __wrapped_comp_ref);
} else {
// Unoptimized implementation which compares the iterators against the end in every loop iteration
return std::__lexicographical_compare_three_way_slow_path(
std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), __wrapped_comp_ref);
}
}

template <class _InputIterator1, class _InputIterator2>
[[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto lexicographical_compare_three_way(
_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) {
return std::lexicographical_compare_three_way(
std::move(__first1), std::move(__last1), std::move(__first2), std::move(__last2), std::compare_three_way());
}

#endif // _LIBCPP_STD_VER >= 20

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_LEXICOGRAPHICAL_COMPARE_THREE_WAY_H
109 changes: 109 additions & 0 deletions libcxx/include/__cxx03/__algorithm/lower_bound.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_LOWER_BOUND_H
#define _LIBCPP___ALGORITHM_LOWER_BOUND_H

#include <__algorithm/comp.h>
#include <__algorithm/half_positive.h>
#include <__algorithm/iterator_operations.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__iterator/advance.h>
#include <__iterator/distance.h>
#include <__iterator/iterator_traits.h>
#include <__type_traits/is_callable.h>
#include <__type_traits/remove_reference.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _AlgPolicy, class _Iter, class _Type, class _Proj, class _Comp>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Iter __lower_bound_bisecting(
_Iter __first,
const _Type& __value,
typename iterator_traits<_Iter>::difference_type __len,
_Comp& __comp,
_Proj& __proj) {
while (__len != 0) {
auto __l2 = std::__half_positive(__len);
_Iter __m = __first;
_IterOps<_AlgPolicy>::advance(__m, __l2);
if (std::__invoke(__comp, std::__invoke(__proj, *__m), __value)) {
__first = ++__m;
__len -= __l2 + 1;
} else {
__len = __l2;
}
}
return __first;
}

// One-sided binary search, aka meta binary search, has been in the public domain for decades, and has the general
// advantage of being \Omega(1) rather than the classic algorithm's \Omega(log(n)), with the downside of executing at
// most 2*log(n) comparisons vs the classic algorithm's exact log(n). There are two scenarios in which it really shines:
// the first one is when operating over non-random-access iterators, because the classic algorithm requires knowing the
// container's size upfront, which adds \Omega(n) iterator increments to the complexity. The second one is when you're
// traversing the container in order, trying to fast-forward to the next value: in that case, the classic algorithm
// would yield \Omega(n*log(n)) comparisons and, for non-random-access iterators, \Omega(n^2) iterator increments,
// whereas the one-sided version will yield O(n) operations on both counts, with a \Omega(log(n)) bound on the number of
// comparisons.
template <class _AlgPolicy, class _ForwardIterator, class _Sent, class _Type, class _Proj, class _Comp>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
__lower_bound_onesided(_ForwardIterator __first, _Sent __last, const _Type& __value, _Comp& __comp, _Proj& __proj) {
// step = 0, ensuring we can always short-circuit when distance is 1 later on
if (__first == __last || !std::__invoke(__comp, std::__invoke(__proj, *__first), __value))
return __first;

using _Distance = typename iterator_traits<_ForwardIterator>::difference_type;
for (_Distance __step = 1; __first != __last; __step <<= 1) {
auto __it = __first;
auto __dist = __step - _IterOps<_AlgPolicy>::__advance_to(__it, __step, __last);
// once we reach the last range where needle can be we must start
// looking inwards, bisecting that range
if (__it == __last || !std::__invoke(__comp, std::__invoke(__proj, *__it), __value)) {
// we've already checked the previous value and it was less, we can save
// one comparison by skipping bisection
if (__dist == 1)
return __it;
return std::__lower_bound_bisecting<_AlgPolicy>(__first, __value, __dist, __comp, __proj);
}
// range not found, move forward!
__first = __it;
}
return __first;
}

template <class _AlgPolicy, class _ForwardIterator, class _Sent, class _Type, class _Proj, class _Comp>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
__lower_bound(_ForwardIterator __first, _Sent __last, const _Type& __value, _Comp& __comp, _Proj& __proj) {
const auto __dist = _IterOps<_AlgPolicy>::distance(__first, __last);
return std::__lower_bound_bisecting<_AlgPolicy>(__first, __value, __dist, __comp, __proj);
}

template <class _ForwardIterator, class _Tp, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value, _Compare __comp) {
static_assert(__is_callable<_Compare, decltype(*__first), const _Tp&>::value, "The comparator has to be callable");
auto __proj = std::__identity();
return std::__lower_bound<_ClassicAlgPolicy>(__first, __last, __value, __comp, __proj);
}

template <class _ForwardIterator, class _Tp>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator
lower_bound(_ForwardIterator __first, _ForwardIterator __last, const _Tp& __value) {
return std::lower_bound(__first, __last, __value, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_LOWER_BOUND_H
60 changes: 60 additions & 0 deletions libcxx/include/__cxx03/__algorithm/make_heap.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MAKE_HEAP_H
#define _LIBCPP___ALGORITHM_MAKE_HEAP_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/iterator_operations.h>
#include <__algorithm/sift_down.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _AlgPolicy, class _Compare, class _RandomAccessIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
__make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare&& __comp) {
__comp_ref_type<_Compare> __comp_ref = __comp;

using difference_type = typename iterator_traits<_RandomAccessIterator>::difference_type;
difference_type __n = __last - __first;
if (__n > 1) {
// start from the first parent, there is no need to consider children
for (difference_type __start = (__n - 2) / 2; __start >= 0; --__start) {
std::__sift_down<_AlgPolicy>(__first, __comp_ref, __n, __first + __start);
}
}
}

template <class _RandomAccessIterator, class _Compare>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp) {
std::__make_heap<_ClassicAlgPolicy>(std::move(__first), std::move(__last), __comp);
}

template <class _RandomAccessIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
make_heap(_RandomAccessIterator __first, _RandomAccessIterator __last) {
std::make_heap(std::move(__first), std::move(__last), __less<>());
}

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_MAKE_HEAP_H
106 changes: 106 additions & 0 deletions libcxx/include/__cxx03/__algorithm/make_projected.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MAKE_PROJECTED_H
#define _LIBCPP___ALGORITHM_MAKE_PROJECTED_H

#include <__concepts/same_as.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__type_traits/decay.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_member_pointer.h>
#include <__type_traits/is_same.h>
#include <__utility/declval.h>
#include <__utility/forward.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Pred, class _Proj>
struct _ProjectedPred {
_Pred& __pred; // Can be a unary or a binary predicate.
_Proj& __proj;

_LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI _ProjectedPred(_Pred& __pred_arg, _Proj& __proj_arg)
: __pred(__pred_arg), __proj(__proj_arg) {}

template <class _Tp>
typename __invoke_of<_Pred&, decltype(std::__invoke(std::declval<_Proj&>(), std::declval<_Tp>()))>::type
_LIBCPP_CONSTEXPR _LIBCPP_HIDE_FROM_ABI
operator()(_Tp&& __v) const {
return std::__invoke(__pred, std::__invoke(__proj, std::forward<_Tp>(__v)));
}

template <class _T1, class _T2>
typename __invoke_of<_Pred&,
decltype(std::__invoke(std::declval<_Proj&>(), std::declval<_T1>())),
decltype(std::__invoke(std::declval<_Proj&>(), std::declval<_T2>()))>::type _LIBCPP_CONSTEXPR
_LIBCPP_HIDE_FROM_ABI
operator()(_T1&& __lhs, _T2&& __rhs) const {
return std::__invoke(
__pred, std::__invoke(__proj, std::forward<_T1>(__lhs)), std::__invoke(__proj, std::forward<_T2>(__rhs)));
}
};

template <
class _Pred,
class _Proj,
__enable_if_t<!(!is_member_pointer<__decay_t<_Pred> >::value && __is_identity<__decay_t<_Proj> >::value), int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _ProjectedPred<_Pred, _Proj> __make_projected(_Pred& __pred, _Proj& __proj) {
return _ProjectedPred<_Pred, _Proj>(__pred, __proj);
}

// Avoid creating the functor and just use the pristine comparator -- for certain algorithms, this would enable
// optimizations that rely on the type of the comparator. Additionally, this results in less layers of indirection in
// the call stack when the comparator is invoked, even in an unoptimized build.
template <
class _Pred,
class _Proj,
__enable_if_t<!is_member_pointer<__decay_t<_Pred> >::value && __is_identity<__decay_t<_Proj> >::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Pred& __make_projected(_Pred& __pred, _Proj&) {
return __pred;
}

_LIBCPP_END_NAMESPACE_STD

#if _LIBCPP_STD_VER >= 20

_LIBCPP_BEGIN_NAMESPACE_STD

namespace ranges {

template <class _Comp, class _Proj1, class _Proj2>
_LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) __make_projected_comp(_Comp& __comp, _Proj1& __proj1, _Proj2& __proj2) {
if constexpr (__is_identity<decay_t<_Proj1>>::value && __is_identity<decay_t<_Proj2>>::value &&
!is_member_pointer_v<decay_t<_Comp>>) {
// Avoid creating the lambda and just use the pristine comparator -- for certain algorithms, this would enable
// optimizations that rely on the type of the comparator.
return __comp;

} else {
return [&](auto&& __lhs, auto&& __rhs) -> bool {
return std::invoke(__comp,
std::invoke(__proj1, std::forward<decltype(__lhs)>(__lhs)),
std::invoke(__proj2, std::forward<decltype(__rhs)>(__rhs)));
};
}
}

} // namespace ranges

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP_STD_VER >= 20

#endif // _LIBCPP___ALGORITHM_MAKE_PROJECTED_H
58 changes: 58 additions & 0 deletions libcxx/include/__cxx03/__algorithm/max.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MAX_H
#define _LIBCPP___ALGORITHM_MAX_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/max_element.h>
#include <__config>
#include <initializer_list>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp&
max(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b, _Compare __comp) {
return __comp(__a, __b) ? __b : __a;
}

template <class _Tp>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp&
max(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b) {
return std::max(__a, __b, __less<>());
}

#ifndef _LIBCPP_CXX03_LANG

template <class _Tp, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp
max(initializer_list<_Tp> __t, _Compare __comp) {
return *std::__max_element<__comp_ref_type<_Compare> >(__t.begin(), __t.end(), __comp);
}

template <class _Tp>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp max(initializer_list<_Tp> __t) {
return *std::max_element(__t.begin(), __t.end(), __less<>());
}

#endif // _LIBCPP_CXX03_LANG

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_MAX_H
51 changes: 51 additions & 0 deletions libcxx/include/__cxx03/__algorithm/max_element.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MAX_ELEMENT_H
#define _LIBCPP___ALGORITHM_MAX_ELEMENT_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__config>
#include <__iterator/iterator_traits.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Compare, class _ForwardIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
__max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) {
static_assert(
__has_forward_iterator_category<_ForwardIterator>::value, "std::max_element requires a ForwardIterator");
if (__first != __last) {
_ForwardIterator __i = __first;
while (++__i != __last)
if (__comp(*__first, *__i))
__first = __i;
}
return __first;
}

template <class _ForwardIterator, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
max_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) {
return std::__max_element<__comp_ref_type<_Compare> >(__first, __last, __comp);
}

template <class _ForwardIterator>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
max_element(_ForwardIterator __first, _ForwardIterator __last) {
return std::max_element(__first, __last, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_MAX_ELEMENT_H
69 changes: 69 additions & 0 deletions libcxx/include/__cxx03/__algorithm/merge.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MERGE_H
#define _LIBCPP___ALGORITHM_MERGE_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/copy.h>
#include <__config>
#include <__iterator/iterator_traits.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator __merge(
_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
_OutputIterator __result,
_Compare __comp) {
for (; __first1 != __last1; ++__result) {
if (__first2 == __last2)
return std::copy(__first1, __last1, __result);
if (__comp(*__first2, *__first1)) {
*__result = *__first2;
++__first2;
} else {
*__result = *__first1;
++__first1;
}
}
return std::copy(__first2, __last2, __result);
}

template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
merge(_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
_OutputIterator __result,
_Compare __comp) {
return std::__merge<__comp_ref_type<_Compare> >(__first1, __last1, __first2, __last2, __result, __comp);
}

template <class _InputIterator1, class _InputIterator2, class _OutputIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
merge(_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
_OutputIterator __result) {
return std::merge(__first1, __last1, __first2, __last2, __result, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_MERGE_H
58 changes: 58 additions & 0 deletions libcxx/include/__cxx03/__algorithm/min.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MIN_H
#define _LIBCPP___ALGORITHM_MIN_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/min_element.h>
#include <__config>
#include <initializer_list>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp&
min(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b, _Compare __comp) {
return __comp(__b, __a) ? __b : __a;
}

template <class _Tp>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 const _Tp&
min(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b) {
return std::min(__a, __b, __less<>());
}

#ifndef _LIBCPP_CXX03_LANG

template <class _Tp, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp
min(initializer_list<_Tp> __t, _Compare __comp) {
return *std::__min_element<__comp_ref_type<_Compare> >(__t.begin(), __t.end(), __comp);
}

template <class _Tp>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Tp min(initializer_list<_Tp> __t) {
return *std::min_element(__t.begin(), __t.end(), __less<>());
}

#endif // _LIBCPP_CXX03_LANG

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_MIN_H
71 changes: 71 additions & 0 deletions libcxx/include/__cxx03/__algorithm/min_element.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MIN_ELEMENT_H
#define _LIBCPP___ALGORITHM_MIN_ELEMENT_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__iterator/iterator_traits.h>
#include <__type_traits/is_callable.h>
#include <__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Comp, class _Iter, class _Sent, class _Proj>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Iter
__min_element(_Iter __first, _Sent __last, _Comp __comp, _Proj& __proj) {
if (__first == __last)
return __first;

_Iter __i = __first;
while (++__i != __last)
if (std::__invoke(__comp, std::__invoke(__proj, *__i), std::__invoke(__proj, *__first)))
__first = __i;

return __first;
}

template <class _Comp, class _Iter, class _Sent>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _Iter __min_element(_Iter __first, _Sent __last, _Comp __comp) {
auto __proj = __identity();
return std::__min_element<_Comp>(std::move(__first), std::move(__last), __comp, __proj);
}

template <class _ForwardIterator, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
min_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) {
static_assert(
__has_forward_iterator_category<_ForwardIterator>::value, "std::min_element requires a ForwardIterator");
static_assert(
__is_callable<_Compare, decltype(*__first), decltype(*__first)>::value, "The comparator has to be callable");

return std::__min_element<__comp_ref_type<_Compare> >(std::move(__first), std::move(__last), __comp);
}

template <class _ForwardIterator>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator
min_element(_ForwardIterator __first, _ForwardIterator __last) {
return std::min_element(__first, __last, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_MIN_ELEMENT_H
56 changes: 56 additions & 0 deletions libcxx/include/__cxx03/__algorithm/min_max_result.h
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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MIN_MAX_RESULT_H
#define _LIBCPP___ALGORITHM_MIN_MAX_RESULT_H

#include <__concepts/convertible_to.h>
#include <__config>
#include <__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

#if _LIBCPP_STD_VER >= 20

namespace ranges {

template <class _T1>
struct min_max_result {
_LIBCPP_NO_UNIQUE_ADDRESS _T1 min;
_LIBCPP_NO_UNIQUE_ADDRESS _T1 max;

template <class _T2>
requires convertible_to<const _T1&, _T2>
_LIBCPP_HIDE_FROM_ABI constexpr operator min_max_result<_T2>() const& {
return {min, max};
}

template <class _T2>
requires convertible_to<_T1, _T2>
_LIBCPP_HIDE_FROM_ABI constexpr operator min_max_result<_T2>() && {
return {std::move(min), std::move(max)};
}
};

} // namespace ranges

#endif // _LIBCPP_STD_VER >= 20

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_MIN_MAX_RESULT_H
59 changes: 59 additions & 0 deletions libcxx/include/__cxx03/__algorithm/minmax.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MINMAX_H
#define _LIBCPP___ALGORITHM_MINMAX_H

#include <__algorithm/comp.h>
#include <__algorithm/minmax_element.h>
#include <__config>
#include <__functional/identity.h>
#include <__type_traits/is_callable.h>
#include <__utility/pair.h>
#include <initializer_list>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Tp, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<const _Tp&, const _Tp&>
minmax(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b, _Compare __comp) {
return __comp(__b, __a) ? pair<const _Tp&, const _Tp&>(__b, __a) : pair<const _Tp&, const _Tp&>(__a, __b);
}

template <class _Tp>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<const _Tp&, const _Tp&>
minmax(_LIBCPP_LIFETIMEBOUND const _Tp& __a, _LIBCPP_LIFETIMEBOUND const _Tp& __b) {
return std::minmax(__a, __b, __less<>());
}

#ifndef _LIBCPP_CXX03_LANG

template <class _Tp, class _Compare>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_Tp, _Tp>
minmax(initializer_list<_Tp> __t, _Compare __comp) {
static_assert(__is_callable<_Compare, _Tp, _Tp>::value, "The comparator has to be callable");
__identity __proj;
auto __ret = std::__minmax_element_impl(__t.begin(), __t.end(), __comp, __proj);
return pair<_Tp, _Tp>(*__ret.first, *__ret.second);
}

template <class _Tp>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_Tp, _Tp>
minmax(initializer_list<_Tp> __t) {
return std::minmax(__t, __less<>());
}

#endif // _LIBCPP_CXX03_LANG

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_MINMAX_H
100 changes: 100 additions & 0 deletions libcxx/include/__cxx03/__algorithm/minmax_element.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MINMAX_ELEMENT_H
#define _LIBCPP___ALGORITHM_MINMAX_ELEMENT_H

#include <__algorithm/comp.h>
#include <__config>
#include <__functional/identity.h>
#include <__functional/invoke.h>
#include <__iterator/iterator_traits.h>
#include <__type_traits/is_callable.h>
#include <__utility/pair.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Comp, class _Proj>
class _MinmaxElementLessFunc {
_Comp& __comp_;
_Proj& __proj_;

public:
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _MinmaxElementLessFunc(_Comp& __comp, _Proj& __proj)
: __comp_(__comp), __proj_(__proj) {}

template <class _Iter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool operator()(_Iter& __it1, _Iter& __it2) {
return std::__invoke(__comp_, std::__invoke(__proj_, *__it1), std::__invoke(__proj_, *__it2));
}
};

template <class _Iter, class _Sent, class _Proj, class _Comp>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_Iter, _Iter>
__minmax_element_impl(_Iter __first, _Sent __last, _Comp& __comp, _Proj& __proj) {
auto __less = _MinmaxElementLessFunc<_Comp, _Proj>(__comp, __proj);

pair<_Iter, _Iter> __result(__first, __first);
if (__first == __last || ++__first == __last)
return __result;

if (__less(__first, __result.first))
__result.first = __first;
else
__result.second = __first;

while (++__first != __last) {
_Iter __i = __first;
if (++__first == __last) {
if (__less(__i, __result.first))
__result.first = __i;
else if (!__less(__i, __result.second))
__result.second = __i;
return __result;
}

if (__less(__first, __i)) {
if (__less(__first, __result.first))
__result.first = __first;
if (!__less(__i, __result.second))
__result.second = __i;
} else {
if (__less(__i, __result.first))
__result.first = __i;
if (!__less(__first, __result.second))
__result.second = __first;
}
}

return __result;
}

template <class _ForwardIterator, class _Compare>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_ForwardIterator, _ForwardIterator>
minmax_element(_ForwardIterator __first, _ForwardIterator __last, _Compare __comp) {
static_assert(
__has_forward_iterator_category<_ForwardIterator>::value, "std::minmax_element requires a ForwardIterator");
static_assert(
__is_callable<_Compare, decltype(*__first), decltype(*__first)>::value, "The comparator has to be callable");
auto __proj = __identity();
return std::__minmax_element_impl(__first, __last, __comp, __proj);
}

template <class _ForwardIterator>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_ForwardIterator, _ForwardIterator>
minmax_element(_ForwardIterator __first, _ForwardIterator __last) {
return std::minmax_element(__first, __last, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_MINMAX_ELEMENT_H
217 changes: 217 additions & 0 deletions libcxx/include/__cxx03/__algorithm/mismatch.h
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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MISMATCH_H
#define _LIBCPP___ALGORITHM_MISMATCH_H

#include <__algorithm/comp.h>
#include <__algorithm/min.h>
#include <__algorithm/simd_utils.h>
#include <__algorithm/unwrap_iter.h>
#include <__config>
#include <__functional/identity.h>
#include <__iterator/aliasing_iterator.h>
#include <__type_traits/desugars_to.h>
#include <__type_traits/invoke.h>
#include <__type_traits/is_constant_evaluated.h>
#include <__type_traits/is_equality_comparable.h>
#include <__type_traits/is_integral.h>
#include <__utility/move.h>
#include <__utility/pair.h>
#include <__utility/unreachable.h>
#include <cstddef>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Iter1, class _Sent1, class _Iter2, class _Pred, class _Proj1, class _Proj2>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_Iter1, _Iter2>
__mismatch_loop(_Iter1 __first1, _Sent1 __last1, _Iter2 __first2, _Pred& __pred, _Proj1& __proj1, _Proj2& __proj2) {
while (__first1 != __last1) {
if (!std::__invoke(__pred, std::__invoke(__proj1, *__first1), std::__invoke(__proj2, *__first2)))
break;
++__first1;
++__first2;
}
return std::make_pair(std::move(__first1), std::move(__first2));
}

template <class _Iter1, class _Sent1, class _Iter2, class _Pred, class _Proj1, class _Proj2>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_Iter1, _Iter2>
__mismatch(_Iter1 __first1, _Sent1 __last1, _Iter2 __first2, _Pred& __pred, _Proj1& __proj1, _Proj2& __proj2) {
return std::__mismatch_loop(__first1, __last1, __first2, __pred, __proj1, __proj2);
}

#if _LIBCPP_VECTORIZE_ALGORITHMS

template <class _Iter>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_Iter, _Iter>
__mismatch_vectorized(_Iter __first1, _Iter __last1, _Iter __first2) {
using __value_type = __iter_value_type<_Iter>;
constexpr size_t __unroll_count = 4;
constexpr size_t __vec_size = __native_vector_size<__value_type>;
using __vec = __simd_vector<__value_type, __vec_size>;

if (!__libcpp_is_constant_evaluated()) {
auto __orig_first1 = __first1;
auto __last2 = __first2 + (__last1 - __first1);
while (static_cast<size_t>(__last1 - __first1) >= __unroll_count * __vec_size) [[__unlikely__]] {
__vec __lhs[__unroll_count];
__vec __rhs[__unroll_count];

for (size_t __i = 0; __i != __unroll_count; ++__i) {
__lhs[__i] = std::__load_vector<__vec>(__first1 + __i * __vec_size);
__rhs[__i] = std::__load_vector<__vec>(__first2 + __i * __vec_size);
}

for (size_t __i = 0; __i != __unroll_count; ++__i) {
if (auto __cmp_res = __lhs[__i] == __rhs[__i]; !std::__all_of(__cmp_res)) {
auto __offset = __i * __vec_size + std::__find_first_not_set(__cmp_res);
return {__first1 + __offset, __first2 + __offset};
}
}

__first1 += __unroll_count * __vec_size;
__first2 += __unroll_count * __vec_size;
}

// check the remaining 0-3 vectors
while (static_cast<size_t>(__last1 - __first1) >= __vec_size) {
if (auto __cmp_res = std::__load_vector<__vec>(__first1) == std::__load_vector<__vec>(__first2);
!std::__all_of(__cmp_res)) {
auto __offset = std::__find_first_not_set(__cmp_res);
return {__first1 + __offset, __first2 + __offset};
}
__first1 += __vec_size;
__first2 += __vec_size;
}

if (__last1 - __first1 == 0)
return {__first1, __first2};

// Check if we can load elements in front of the current pointer. If that's the case load a vector at
// (last - vector_size) to check the remaining elements
if (static_cast<size_t>(__first1 - __orig_first1) >= __vec_size) {
__first1 = __last1 - __vec_size;
__first2 = __last2 - __vec_size;
auto __offset =
std::__find_first_not_set(std::__load_vector<__vec>(__first1) == std::__load_vector<__vec>(__first2));
return {__first1 + __offset, __first2 + __offset};
} // else loop over the elements individually
}

__equal_to __pred;
__identity __proj;
return std::__mismatch_loop(__first1, __last1, __first2, __pred, __proj, __proj);
}

template <class _Tp,
class _Pred,
class _Proj1,
class _Proj2,
__enable_if_t<is_integral<_Tp>::value && __desugars_to_v<__equal_tag, _Pred, _Tp, _Tp> &&
__is_identity<_Proj1>::value && __is_identity<_Proj2>::value,
int> = 0>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_Tp*, _Tp*>
__mismatch(_Tp* __first1, _Tp* __last1, _Tp* __first2, _Pred&, _Proj1&, _Proj2&) {
return std::__mismatch_vectorized(__first1, __last1, __first2);
}

template <class _Tp,
class _Pred,
class _Proj1,
class _Proj2,
__enable_if_t<!is_integral<_Tp>::value && __desugars_to_v<__equal_tag, _Pred, _Tp, _Tp> &&
__is_identity<_Proj1>::value && __is_identity<_Proj2>::value &&
__can_map_to_integer_v<_Tp> && __libcpp_is_trivially_equality_comparable<_Tp, _Tp>::value,
int> = 0>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_Tp*, _Tp*>
__mismatch(_Tp* __first1, _Tp* __last1, _Tp* __first2, _Pred& __pred, _Proj1& __proj1, _Proj2& __proj2) {
if (__libcpp_is_constant_evaluated()) {
return std::__mismatch_loop(__first1, __last1, __first2, __pred, __proj1, __proj2);
} else {
using _Iter = __aliasing_iterator<_Tp*, __get_as_integer_type_t<_Tp>>;
auto __ret = std::__mismatch_vectorized(_Iter(__first1), _Iter(__last1), _Iter(__first2));
return {__ret.first.__base(), __ret.second.__base()};
}
}
#endif // _LIBCPP_VECTORIZE_ALGORITHMS

template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_InputIterator1, _InputIterator2>
mismatch(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _BinaryPredicate __pred) {
__identity __proj;
auto __res = std::__mismatch(
std::__unwrap_iter(__first1), std::__unwrap_iter(__last1), std::__unwrap_iter(__first2), __pred, __proj, __proj);
return std::make_pair(std::__rewrap_iter(__first1, __res.first), std::__rewrap_iter(__first2, __res.second));
}

template <class _InputIterator1, class _InputIterator2>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_InputIterator1, _InputIterator2>
mismatch(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2) {
return std::mismatch(__first1, __last1, __first2, __equal_to());
}

#if _LIBCPP_STD_VER >= 14
template <class _Iter1, class _Sent1, class _Iter2, class _Sent2, class _Pred, class _Proj1, class _Proj2>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_Iter1, _Iter2> __mismatch(
_Iter1 __first1, _Sent1 __last1, _Iter2 __first2, _Sent2 __last2, _Pred& __pred, _Proj1& __proj1, _Proj2& __proj2) {
while (__first1 != __last1 && __first2 != __last2) {
if (!std::__invoke(__pred, std::__invoke(__proj1, *__first1), std::__invoke(__proj2, *__first2)))
break;
++__first1;
++__first2;
}
return {std::move(__first1), std::move(__first2)};
}

template <class _Tp, class _Pred, class _Proj1, class _Proj2>
_LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_Tp*, _Tp*>
__mismatch(_Tp* __first1, _Tp* __last1, _Tp* __first2, _Tp* __last2, _Pred& __pred, _Proj1& __proj1, _Proj2& __proj2) {
auto __len = std::min(__last1 - __first1, __last2 - __first2);
return std::__mismatch(__first1, __first1 + __len, __first2, __pred, __proj1, __proj2);
}

template <class _InputIterator1, class _InputIterator2, class _BinaryPredicate>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_InputIterator1, _InputIterator2>
mismatch(_InputIterator1 __first1,
_InputIterator1 __last1,
_InputIterator2 __first2,
_InputIterator2 __last2,
_BinaryPredicate __pred) {
__identity __proj;
auto __res = std::__mismatch(
std::__unwrap_iter(__first1),
std::__unwrap_iter(__last1),
std::__unwrap_iter(__first2),
std::__unwrap_iter(__last2),
__pred,
__proj,
__proj);
return {std::__rewrap_iter(__first1, __res.first), std::__rewrap_iter(__first2, __res.second)};
}

template <class _InputIterator1, class _InputIterator2>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_InputIterator1, _InputIterator2>
mismatch(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _InputIterator2 __last2) {
return std::mismatch(__first1, __last1, __first2, __last2, __equal_to());
}
#endif

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_MISMATCH_H
127 changes: 127 additions & 0 deletions libcxx/include/__cxx03/__algorithm/move.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MOVE_H
#define _LIBCPP___ALGORITHM_MOVE_H

#include <__algorithm/copy_move_common.h>
#include <__algorithm/for_each_segment.h>
#include <__algorithm/iterator_operations.h>
#include <__algorithm/min.h>
#include <__config>
#include <__iterator/segmented_iterator.h>
#include <__type_traits/common_type.h>
#include <__type_traits/is_constructible.h>
#include <__utility/move.h>
#include <__utility/pair.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
__move(_InIter __first, _Sent __last, _OutIter __result);

template <class _AlgPolicy>
struct __move_impl {
template <class _InIter, class _Sent, class _OutIter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
operator()(_InIter __first, _Sent __last, _OutIter __result) const {
while (__first != __last) {
*__result = _IterOps<_AlgPolicy>::__iter_move(__first);
++__first;
++__result;
}
return std::make_pair(std::move(__first), std::move(__result));
}

template <class _InIter, class _OutIter>
struct _MoveSegment {
using _Traits = __segmented_iterator_traits<_InIter>;

_OutIter& __result_;

_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 explicit _MoveSegment(_OutIter& __result)
: __result_(__result) {}

_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
operator()(typename _Traits::__local_iterator __lfirst, typename _Traits::__local_iterator __llast) {
__result_ = std::__move<_AlgPolicy>(__lfirst, __llast, std::move(__result_)).second;
}
};

template <class _InIter, class _OutIter, __enable_if_t<__is_segmented_iterator<_InIter>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
operator()(_InIter __first, _InIter __last, _OutIter __result) const {
std::__for_each_segment(__first, __last, _MoveSegment<_InIter, _OutIter>(__result));
return std::make_pair(__last, std::move(__result));
}

template <class _InIter,
class _OutIter,
__enable_if_t<__has_random_access_iterator_category<_InIter>::value &&
!__is_segmented_iterator<_InIter>::value && __is_segmented_iterator<_OutIter>::value,
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
operator()(_InIter __first, _InIter __last, _OutIter __result) const {
using _Traits = __segmented_iterator_traits<_OutIter>;
using _DiffT = typename common_type<__iter_diff_t<_InIter>, __iter_diff_t<_OutIter> >::type;

if (__first == __last)
return std::make_pair(std::move(__first), std::move(__result));

auto __local_first = _Traits::__local(__result);
auto __segment_iterator = _Traits::__segment(__result);
while (true) {
auto __local_last = _Traits::__end(__segment_iterator);
auto __size = std::min<_DiffT>(__local_last - __local_first, __last - __first);
auto __iters = std::__move<_AlgPolicy>(__first, __first + __size, __local_first);
__first = std::move(__iters.first);

if (__first == __last)
return std::make_pair(std::move(__first), _Traits::__compose(__segment_iterator, std::move(__iters.second)));

__local_first = _Traits::__begin(++__segment_iterator);
}
}

// At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer.
template <class _In, class _Out, __enable_if_t<__can_lower_move_assignment_to_memmove<_In, _Out>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*>
operator()(_In* __first, _In* __last, _Out* __result) const {
return std::__copy_trivial_impl(__first, __last, __result);
}
};

template <class _AlgPolicy, class _InIter, class _Sent, class _OutIter>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
__move(_InIter __first, _Sent __last, _OutIter __result) {
return std::__copy_move_unwrap_iters<__move_impl<_AlgPolicy> >(
std::move(__first), std::move(__last), std::move(__result));
}

template <class _InputIterator, class _OutputIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
move(_InputIterator __first, _InputIterator __last, _OutputIterator __result) {
static_assert(is_copy_constructible<_InputIterator>::value, "Iterators has to be copy constructible.");
static_assert(is_copy_constructible<_OutputIterator>::value, "The output iterator has to be copy constructible.");

return std::__move<_ClassicAlgPolicy>(std::move(__first), std::move(__last), std::move(__result)).second;
}

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_MOVE_H
137 changes: 137 additions & 0 deletions libcxx/include/__cxx03/__algorithm/move_backward.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_MOVE_BACKWARD_H
#define _LIBCPP___ALGORITHM_MOVE_BACKWARD_H

#include <__algorithm/copy_move_common.h>
#include <__algorithm/iterator_operations.h>
#include <__algorithm/min.h>
#include <__config>
#include <__iterator/segmented_iterator.h>
#include <__type_traits/common_type.h>
#include <__type_traits/is_constructible.h>
#include <__utility/move.h>
#include <__utility/pair.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _AlgPolicy, class _BidirectionalIterator1, class _Sentinel, class _BidirectionalIterator2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_BidirectionalIterator1, _BidirectionalIterator2>
__move_backward(_BidirectionalIterator1 __first, _Sentinel __last, _BidirectionalIterator2 __result);

template <class _AlgPolicy>
struct __move_backward_impl {
template <class _InIter, class _Sent, class _OutIter>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
operator()(_InIter __first, _Sent __last, _OutIter __result) const {
auto __last_iter = _IterOps<_AlgPolicy>::next(__first, __last);
auto __original_last_iter = __last_iter;

while (__first != __last_iter) {
*--__result = _IterOps<_AlgPolicy>::__iter_move(--__last_iter);
}

return std::make_pair(std::move(__original_last_iter), std::move(__result));
}

template <class _InIter, class _OutIter, __enable_if_t<__is_segmented_iterator<_InIter>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
operator()(_InIter __first, _InIter __last, _OutIter __result) const {
using _Traits = __segmented_iterator_traits<_InIter>;
auto __sfirst = _Traits::__segment(__first);
auto __slast = _Traits::__segment(__last);
if (__sfirst == __slast) {
auto __iters =
std::__move_backward<_AlgPolicy>(_Traits::__local(__first), _Traits::__local(__last), std::move(__result));
return std::make_pair(__last, __iters.second);
}

__result =
std::__move_backward<_AlgPolicy>(_Traits::__begin(__slast), _Traits::__local(__last), std::move(__result))
.second;
--__slast;
while (__sfirst != __slast) {
__result =
std::__move_backward<_AlgPolicy>(_Traits::__begin(__slast), _Traits::__end(__slast), std::move(__result))
.second;
--__slast;
}
__result = std::__move_backward<_AlgPolicy>(_Traits::__local(__first), _Traits::__end(__slast), std::move(__result))
.second;
return std::make_pair(__last, std::move(__result));
}

template <class _InIter,
class _OutIter,
__enable_if_t<__has_random_access_iterator_category<_InIter>::value &&
!__is_segmented_iterator<_InIter>::value && __is_segmented_iterator<_OutIter>::value,
int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter>
operator()(_InIter __first, _InIter __last, _OutIter __result) const {
using _Traits = __segmented_iterator_traits<_OutIter>;
using _DiffT = typename common_type<__iter_diff_t<_InIter>, __iter_diff_t<_OutIter> >::type;

// When the range contains no elements, __result might not be a valid iterator
if (__first == __last)
return std::make_pair(__first, __result);

auto __orig_last = __last;

auto __local_last = _Traits::__local(__result);
auto __segment_iterator = _Traits::__segment(__result);
while (true) {
auto __local_first = _Traits::__begin(__segment_iterator);
auto __size = std::min<_DiffT>(__local_last - __local_first, __last - __first);
auto __iter = std::__move_backward<_AlgPolicy>(__last - __size, __last, __local_last).second;
__last -= __size;

if (__first == __last)
return std::make_pair(std::move(__orig_last), _Traits::__compose(__segment_iterator, std::move(__iter)));

__local_last = _Traits::__end(--__segment_iterator);
}
}

// At this point, the iterators have been unwrapped so any `contiguous_iterator` has been unwrapped to a pointer.
template <class _In, class _Out, __enable_if_t<__can_lower_move_assignment_to_memmove<_In, _Out>::value, int> = 0>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_In*, _Out*>
operator()(_In* __first, _In* __last, _Out* __result) const {
return std::__copy_backward_trivial_impl(__first, __last, __result);
}
};

template <class _AlgPolicy, class _BidirectionalIterator1, class _Sentinel, class _BidirectionalIterator2>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_BidirectionalIterator1, _BidirectionalIterator2>
__move_backward(_BidirectionalIterator1 __first, _Sentinel __last, _BidirectionalIterator2 __result) {
static_assert(std::is_copy_constructible<_BidirectionalIterator1>::value &&
std::is_copy_constructible<_BidirectionalIterator1>::value,
"Iterators must be copy constructible.");

return std::__copy_move_unwrap_iters<__move_backward_impl<_AlgPolicy> >(
std::move(__first), std::move(__last), std::move(__result));
}

template <class _BidirectionalIterator1, class _BidirectionalIterator2>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _BidirectionalIterator2
move_backward(_BidirectionalIterator1 __first, _BidirectionalIterator1 __last, _BidirectionalIterator2 __result) {
return std::__move_backward<_ClassicAlgPolicy>(std::move(__first), std::move(__last), std::move(__result)).second;
}

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_MOVE_BACKWARD_H
75 changes: 75 additions & 0 deletions libcxx/include/__cxx03/__algorithm/next_permutation.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_NEXT_PERMUTATION_H
#define _LIBCPP___ALGORITHM_NEXT_PERMUTATION_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/iterator_operations.h>
#include <__algorithm/reverse.h>
#include <__config>
#include <__iterator/iterator_traits.h>
#include <__utility/move.h>
#include <__utility/pair.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _AlgPolicy, class _Compare, class _BidirectionalIterator, class _Sentinel>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 pair<_BidirectionalIterator, bool>
__next_permutation(_BidirectionalIterator __first, _Sentinel __last, _Compare&& __comp) {
using _Result = pair<_BidirectionalIterator, bool>;

_BidirectionalIterator __last_iter = _IterOps<_AlgPolicy>::next(__first, __last);
_BidirectionalIterator __i = __last_iter;
if (__first == __last || __first == --__i)
return _Result(std::move(__last_iter), false);

while (true) {
_BidirectionalIterator __ip1 = __i;
if (__comp(*--__i, *__ip1)) {
_BidirectionalIterator __j = __last_iter;
while (!__comp(*__i, *--__j))
;
_IterOps<_AlgPolicy>::iter_swap(__i, __j);
std::__reverse<_AlgPolicy>(__ip1, __last_iter);
return _Result(std::move(__last_iter), true);
}
if (__i == __first) {
std::__reverse<_AlgPolicy>(__first, __last_iter);
return _Result(std::move(__last_iter), false);
}
}
}

template <class _BidirectionalIterator, class _Compare>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
next_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last, _Compare __comp) {
return std::__next_permutation<_ClassicAlgPolicy>(
std::move(__first), std::move(__last), static_cast<__comp_ref_type<_Compare> >(__comp))
.second;
}

template <class _BidirectionalIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
next_permutation(_BidirectionalIterator __first, _BidirectionalIterator __last) {
return std::next_permutation(__first, __last, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_NEXT_PERMUTATION_H
32 changes: 32 additions & 0 deletions libcxx/include/__cxx03/__algorithm/none_of.h
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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_NONE_OF_H
#define _LIBCPP___ALGORITHM_NONE_OF_H

#include <__config>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _InputIterator, class _Predicate>
_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 bool
none_of(_InputIterator __first, _InputIterator __last, _Predicate __pred) {
for (; __first != __last; ++__first)
if (__pred(*__first))
return false;
return true;
}

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___ALGORITHM_NONE_OF_H
261 changes: 261 additions & 0 deletions libcxx/include/__cxx03/__algorithm/nth_element.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_NTH_ELEMENT_H
#define _LIBCPP___ALGORITHM_NTH_ELEMENT_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/iterator_operations.h>
#include <__algorithm/sort.h>
#include <__assert>
#include <__config>
#include <__debug_utils/randomize_range.h>
#include <__iterator/iterator_traits.h>
#include <__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _Compare, class _RandomAccessIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 bool __nth_element_find_guard(
_RandomAccessIterator& __i, _RandomAccessIterator& __j, _RandomAccessIterator __m, _Compare __comp) {
// manually guard downward moving __j against __i
while (true) {
if (__i == --__j) {
return false;
}
if (__comp(*__j, *__m)) {
return true; // found guard for downward moving __j, now use unguarded partition
}
}
}

template <class _AlgPolicy, class _Compare, class _RandomAccessIterator>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 void
// NOLINTNEXTLINE(readability-function-cognitive-complexity)
__nth_element(
_RandomAccessIterator __first, _RandomAccessIterator __nth, _RandomAccessIterator __last, _Compare __comp) {
using _Ops = _IterOps<_AlgPolicy>;

// _Compare is known to be a reference type
typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type;
const difference_type __limit = 7;
while (true) {
if (__nth == __last)
return;
difference_type __len = __last - __first;
switch (__len) {
case 0:
case 1:
return;
case 2:
if (__comp(*--__last, *__first))
_Ops::iter_swap(__first, __last);
return;
case 3: {
_RandomAccessIterator __m = __first;
std::__sort3<_AlgPolicy, _Compare>(__first, ++__m, --__last, __comp);
return;
}
}
if (__len <= __limit) {
std::__selection_sort<_AlgPolicy, _Compare>(__first, __last, __comp);
return;
}
// __len > __limit >= 3
_RandomAccessIterator __m = __first + __len / 2;
_RandomAccessIterator __lm1 = __last;
unsigned __n_swaps = std::__sort3<_AlgPolicy, _Compare>(__first, __m, --__lm1, __comp);
// *__m is median
// partition [__first, __m) < *__m and *__m <= [__m, __last)
// (this inhibits tossing elements equivalent to __m around unnecessarily)
_RandomAccessIterator __i = __first;
_RandomAccessIterator __j = __lm1;
// j points beyond range to be tested, *__lm1 is known to be <= *__m
// The search going up is known to be guarded but the search coming down isn't.
// Prime the downward search with a guard.
if (!__comp(*__i, *__m)) // if *__first == *__m
{
// *__first == *__m, *__first doesn't go in first part
if (std::__nth_element_find_guard<_Compare>(__i, __j, __m, __comp)) {
_Ops::iter_swap(__i, __j);
++__n_swaps;
} else {
// *__first == *__m, *__m <= all other elements
// Partition instead into [__first, __i) == *__first and *__first < [__i, __last)
++__i; // __first + 1
__j = __last;
if (!__comp(*__first, *--__j)) { // we need a guard if *__first == *(__last-1)
while (true) {
if (__i == __j) {
return; // [__first, __last) all equivalent elements
} else if (__comp(*__first, *__i)) {
_Ops::iter_swap(__i, __j);
++__n_swaps;
++__i;
break;
}
++__i;
}
}
// [__first, __i) == *__first and *__first < [__j, __last) and __j == __last - 1
if (__i == __j) {
return;
}
while (true) {
while (!__comp(*__first, *__i)) {
++__i;
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
__i != __last,
"Would read out of bounds, does your comparator satisfy the strict-weak ordering requirement?");
}
do {
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
__j != __first,
"Would read out of bounds, does your comparator satisfy the strict-weak ordering requirement?");
--__j;
} while (__comp(*__first, *__j));
if (__i >= __j)
break;
_Ops::iter_swap(__i, __j);
++__n_swaps;
++__i;
}
// [__first, __i) == *__first and *__first < [__i, __last)
// The first part is sorted,
if (__nth < __i) {
return;
}
// __nth_element the second part
// std::__nth_element<_Compare>(__i, __nth, __last, __comp);
__first = __i;
continue;
}
}
++__i;
// j points beyond range to be tested, *__lm1 is known to be <= *__m
// if not yet partitioned...
if (__i < __j) {
// known that *(__i - 1) < *__m
while (true) {
// __m still guards upward moving __i
while (__comp(*__i, *__m)) {
++__i;
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
__i != __last,
"Would read out of bounds, does your comparator satisfy the strict-weak ordering requirement?");
}
// It is now known that a guard exists for downward moving __j
do {
_LIBCPP_ASSERT_VALID_ELEMENT_ACCESS(
__j != __first,
"Would read out of bounds, does your comparator satisfy the strict-weak ordering requirement?");
--__j;
} while (!__comp(*__j, *__m));
if (__i >= __j)
break;
_Ops::iter_swap(__i, __j);
++__n_swaps;
// It is known that __m != __j
// If __m just moved, follow it
if (__m == __i)
__m = __j;
++__i;
}
}
// [__first, __i) < *__m and *__m <= [__i, __last)
if (__i != __m && __comp(*__m, *__i)) {
_Ops::iter_swap(__i, __m);
++__n_swaps;
}
// [__first, __i) < *__i and *__i <= [__i+1, __last)
if (__nth == __i)
return;
if (__n_swaps == 0) {
// We were given a perfectly partitioned sequence. Coincidence?
if (__nth < __i) {
// Check for [__first, __i) already sorted
__j = __m = __first;
while (true) {
if (++__j == __i) {
// [__first, __i) sorted
return;
}
if (__comp(*__j, *__m)) {
// not yet sorted, so sort
break;
}
__m = __j;
}
} else {
// Check for [__i, __last) already sorted
__j = __m = __i;
while (true) {
if (++__j == __last) {
// [__i, __last) sorted
return;
}
if (__comp(*__j, *__m)) {
// not yet sorted, so sort
break;
}
__m = __j;
}
}
}
// __nth_element on range containing __nth
if (__nth < __i) {
// std::__nth_element<_Compare>(__first, __nth, __i, __comp);
__last = __i;
} else {
// std::__nth_element<_Compare>(__i+1, __nth, __last, __comp);
__first = ++__i;
}
}
}

template <class _AlgPolicy, class _RandomAccessIterator, class _Compare>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void __nth_element_impl(
_RandomAccessIterator __first, _RandomAccessIterator __nth, _RandomAccessIterator __last, _Compare& __comp) {
if (__nth == __last)
return;

std::__debug_randomize_range<_AlgPolicy>(__first, __last);

std::__nth_element<_AlgPolicy, __comp_ref_type<_Compare> >(__first, __nth, __last, __comp);

std::__debug_randomize_range<_AlgPolicy>(__first, __nth);
if (__nth != __last) {
std::__debug_randomize_range<_AlgPolicy>(++__nth, __last);
}
}

template <class _RandomAccessIterator, class _Compare>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, _RandomAccessIterator __last, _Compare __comp) {
std::__nth_element_impl<_ClassicAlgPolicy>(std::move(__first), std::move(__nth), std::move(__last), __comp);
}

template <class _RandomAccessIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, _RandomAccessIterator __last) {
std::nth_element(std::move(__first), std::move(__nth), std::move(__last), __less<>());
}

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_NTH_ELEMENT_H
91 changes: 91 additions & 0 deletions libcxx/include/__cxx03/__algorithm/partial_sort.h
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___ALGORITHM_PARTIAL_SORT_H
#define _LIBCPP___ALGORITHM_PARTIAL_SORT_H

#include <__algorithm/comp.h>
#include <__algorithm/comp_ref_type.h>
#include <__algorithm/iterator_operations.h>
#include <__algorithm/make_heap.h>
#include <__algorithm/sift_down.h>
#include <__algorithm/sort_heap.h>
#include <__config>
#include <__debug_utils/randomize_range.h>
#include <__iterator/iterator_traits.h>
#include <__type_traits/is_assignable.h>
#include <__type_traits/is_constructible.h>
#include <__utility/move.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

template <class _AlgPolicy, class _Compare, class _RandomAccessIterator, class _Sentinel>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandomAccessIterator __partial_sort_impl(
_RandomAccessIterator __first, _RandomAccessIterator __middle, _Sentinel __last, _Compare&& __comp) {
if (__first == __middle) {
return _IterOps<_AlgPolicy>::next(__middle, __last);
}

std::__make_heap<_AlgPolicy>(__first, __middle, __comp);

typename iterator_traits<_RandomAccessIterator>::difference_type __len = __middle - __first;
_RandomAccessIterator __i = __middle;
for (; __i != __last; ++__i) {
if (__comp(*__i, *__first)) {
_IterOps<_AlgPolicy>::iter_swap(__i, __first);
std::__sift_down<_AlgPolicy>(__first, __comp, __len, __first);
}
}
std::__sort_heap<_AlgPolicy>(std::move(__first), std::move(__middle), __comp);

return __i;
}

template <class _AlgPolicy, class _Compare, class _RandomAccessIterator, class _Sentinel>
_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _RandomAccessIterator
__partial_sort(_RandomAccessIterator __first, _RandomAccessIterator __middle, _Sentinel __last, _Compare& __comp) {
if (__first == __middle)
return _IterOps<_AlgPolicy>::next(__middle, __last);

std::__debug_randomize_range<_AlgPolicy>(__first, __last);

auto __last_iter =
std::__partial_sort_impl<_AlgPolicy>(__first, __middle, __last, static_cast<__comp_ref_type<_Compare> >(__comp));

std::__debug_randomize_range<_AlgPolicy>(__middle, __last);

return __last_iter;
}

template <class _RandomAccessIterator, class _Compare>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void partial_sort(
_RandomAccessIterator __first, _RandomAccessIterator __middle, _RandomAccessIterator __last, _Compare __comp) {
static_assert(std::is_copy_constructible<_RandomAccessIterator>::value, "Iterators must be copy constructible.");
static_assert(std::is_copy_assignable<_RandomAccessIterator>::value, "Iterators must be copy assignable.");

(void)std::__partial_sort<_ClassicAlgPolicy>(std::move(__first), std::move(__middle), std::move(__last), __comp);
}

template <class _RandomAccessIterator>
inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
partial_sort(_RandomAccessIterator __first, _RandomAccessIterator __middle, _RandomAccessIterator __last) {
std::partial_sort(__first, __middle, __last, __less<>());
}

_LIBCPP_END_NAMESPACE_STD

_LIBCPP_POP_MACROS

#endif // _LIBCPP___ALGORITHM_PARTIAL_SORT_H
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