diff options
Diffstat (limited to 'libcxx/include/__algorithm/rotate.h')
| -rw-r--r-- | libcxx/include/__algorithm/rotate.h | 264 |
1 files changed, 118 insertions, 146 deletions
diff --git a/libcxx/include/__algorithm/rotate.h b/libcxx/include/__algorithm/rotate.h index f9236fc..d8162b1 100644 --- a/libcxx/include/__algorithm/rotate.h +++ b/libcxx/include/__algorithm/rotate.h @@ -27,193 +27,165 @@ _LIBCPP_BEGIN_NAMESPACE_STD template <class _AlgPolicy, class _ForwardIterator> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator -__rotate_left(_ForwardIterator __first, _ForwardIterator __last) -{ - typedef typename iterator_traits<_ForwardIterator>::value_type value_type; - using _Ops = _IterOps<_AlgPolicy>; - - value_type __tmp = _Ops::__iter_move(__first); - _ForwardIterator __lm1 = std::__move<_AlgPolicy>( - _Ops::next(__first), __last, __first).second; - *__lm1 = std::move(__tmp); - return __lm1; +__rotate_left(_ForwardIterator __first, _ForwardIterator __last) { + typedef typename iterator_traits<_ForwardIterator>::value_type value_type; + using _Ops = _IterOps<_AlgPolicy>; + + value_type __tmp = _Ops::__iter_move(__first); + _ForwardIterator __lm1 = std::__move<_AlgPolicy>(_Ops::next(__first), __last, __first).second; + *__lm1 = std::move(__tmp); + return __lm1; } template <class _AlgPolicy, class _BidirectionalIterator> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _BidirectionalIterator -__rotate_right(_BidirectionalIterator __first, _BidirectionalIterator __last) -{ - typedef typename iterator_traits<_BidirectionalIterator>::value_type value_type; - using _Ops = _IterOps<_AlgPolicy>; - - _BidirectionalIterator __lm1 = _Ops::prev(__last); - value_type __tmp = _Ops::__iter_move(__lm1); - _BidirectionalIterator __fp1 = std::__move_backward<_AlgPolicy>(__first, __lm1, std::move(__last)).second; - *__first = std::move(__tmp); - return __fp1; +__rotate_right(_BidirectionalIterator __first, _BidirectionalIterator __last) { + typedef typename iterator_traits<_BidirectionalIterator>::value_type value_type; + using _Ops = _IterOps<_AlgPolicy>; + + _BidirectionalIterator __lm1 = _Ops::prev(__last); + value_type __tmp = _Ops::__iter_move(__lm1); + _BidirectionalIterator __fp1 = std::__move_backward<_AlgPolicy>(__first, __lm1, std::move(__last)).second; + *__first = std::move(__tmp); + return __fp1; } template <class _AlgPolicy, class _ForwardIterator> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 _ForwardIterator -__rotate_forward(_ForwardIterator __first, _ForwardIterator __middle, _ForwardIterator __last) -{ - _ForwardIterator __i = __middle; - while (true) - { - _IterOps<_AlgPolicy>::iter_swap(__first, __i); - ++__first; - if (++__i == __last) - break; +__rotate_forward(_ForwardIterator __first, _ForwardIterator __middle, _ForwardIterator __last) { + _ForwardIterator __i = __middle; + while (true) { + _IterOps<_AlgPolicy>::iter_swap(__first, __i); + ++__first; + if (++__i == __last) + break; + if (__first == __middle) + __middle = __i; + } + _ForwardIterator __r = __first; + if (__first != __middle) { + __i = __middle; + while (true) { + _IterOps<_AlgPolicy>::iter_swap(__first, __i); + ++__first; + if (++__i == __last) { if (__first == __middle) - __middle = __i; - } - _ForwardIterator __r = __first; - if (__first != __middle) - { + break; __i = __middle; - while (true) - { - _IterOps<_AlgPolicy>::iter_swap(__first, __i); - ++__first; - if (++__i == __last) - { - if (__first == __middle) - break; - __i = __middle; - } - else if (__first == __middle) - __middle = __i; - } + } else if (__first == __middle) + __middle = __i; } - return __r; + } + return __r; } -template<typename _Integral> -inline _LIBCPP_HIDE_FROM_ABI -_LIBCPP_CONSTEXPR_SINCE_CXX17 _Integral -__algo_gcd(_Integral __x, _Integral __y) -{ - do - { - _Integral __t = __x % __y; - __x = __y; - __y = __t; - } while (__y); - return __x; +template <typename _Integral> +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 _Integral __algo_gcd(_Integral __x, _Integral __y) { + do { + _Integral __t = __x % __y; + __x = __y; + __y = __t; + } while (__y); + return __x; } template <class _AlgPolicy, typename _RandomAccessIterator> _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 _RandomAccessIterator -__rotate_gcd(_RandomAccessIterator __first, _RandomAccessIterator __middle, _RandomAccessIterator __last) -{ - typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type; - typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; - using _Ops = _IterOps<_AlgPolicy>; - - const difference_type __m1 = __middle - __first; - const difference_type __m2 = _Ops::distance(__middle, __last); - if (__m1 == __m2) - { - std::__swap_ranges<_AlgPolicy>(__first, __middle, __middle, __last); - return __middle; - } - const difference_type __g = std::__algo_gcd(__m1, __m2); - for (_RandomAccessIterator __p = __first + __g; __p != __first;) - { - value_type __t(_Ops::__iter_move(--__p)); - _RandomAccessIterator __p1 = __p; - _RandomAccessIterator __p2 = __p1 + __m1; - do - { - *__p1 = _Ops::__iter_move(__p2); - __p1 = __p2; - const difference_type __d = _Ops::distance(__p2, __last); - if (__m1 < __d) - __p2 += __m1; - else - __p2 = __first + (__m1 - __d); - } while (__p2 != __p); - *__p1 = std::move(__t); - } - return __first + __m2; +__rotate_gcd(_RandomAccessIterator __first, _RandomAccessIterator __middle, _RandomAccessIterator __last) { + typedef typename iterator_traits<_RandomAccessIterator>::difference_type difference_type; + typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; + using _Ops = _IterOps<_AlgPolicy>; + + const difference_type __m1 = __middle - __first; + const difference_type __m2 = _Ops::distance(__middle, __last); + if (__m1 == __m2) { + std::__swap_ranges<_AlgPolicy>(__first, __middle, __middle, __last); + return __middle; + } + const difference_type __g = std::__algo_gcd(__m1, __m2); + for (_RandomAccessIterator __p = __first + __g; __p != __first;) { + value_type __t(_Ops::__iter_move(--__p)); + _RandomAccessIterator __p1 = __p; + _RandomAccessIterator __p2 = __p1 + __m1; + do { + *__p1 = _Ops::__iter_move(__p2); + __p1 = __p2; + const difference_type __d = _Ops::distance(__p2, __last); + if (__m1 < __d) + __p2 += __m1; + else + __p2 = __first + (__m1 - __d); + } while (__p2 != __p); + *__p1 = std::move(__t); + } + return __first + __m2; } template <class _AlgPolicy, class _ForwardIterator> -inline _LIBCPP_HIDE_FROM_ABI -_LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator -__rotate_impl(_ForwardIterator __first, _ForwardIterator __middle, _ForwardIterator __last, - std::forward_iterator_tag) -{ - typedef typename iterator_traits<_ForwardIterator>::value_type value_type; - if (is_trivially_move_assignable<value_type>::value) - { - if (_IterOps<_AlgPolicy>::next(__first) == __middle) - return std::__rotate_left<_AlgPolicy>(__first, __last); - } - return std::__rotate_forward<_AlgPolicy>(__first, __middle, __last); +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _ForwardIterator +__rotate_impl(_ForwardIterator __first, _ForwardIterator __middle, _ForwardIterator __last, std::forward_iterator_tag) { + typedef typename iterator_traits<_ForwardIterator>::value_type value_type; + if (is_trivially_move_assignable<value_type>::value) { + if (_IterOps<_AlgPolicy>::next(__first) == __middle) + return std::__rotate_left<_AlgPolicy>(__first, __last); + } + return std::__rotate_forward<_AlgPolicy>(__first, __middle, __last); } template <class _AlgPolicy, class _BidirectionalIterator> -inline _LIBCPP_HIDE_FROM_ABI -_LIBCPP_CONSTEXPR_SINCE_CXX14 _BidirectionalIterator -__rotate_impl(_BidirectionalIterator __first, _BidirectionalIterator __middle, _BidirectionalIterator __last, - bidirectional_iterator_tag) -{ - typedef typename iterator_traits<_BidirectionalIterator>::value_type value_type; - if (is_trivially_move_assignable<value_type>::value) - { - if (_IterOps<_AlgPolicy>::next(__first) == __middle) - return std::__rotate_left<_AlgPolicy>(__first, __last); - if (_IterOps<_AlgPolicy>::next(__middle) == __last) - return std::__rotate_right<_AlgPolicy>(__first, __last); - } - return std::__rotate_forward<_AlgPolicy>(__first, __middle, __last); +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _BidirectionalIterator __rotate_impl( + _BidirectionalIterator __first, + _BidirectionalIterator __middle, + _BidirectionalIterator __last, + bidirectional_iterator_tag) { + typedef typename iterator_traits<_BidirectionalIterator>::value_type value_type; + if (is_trivially_move_assignable<value_type>::value) { + if (_IterOps<_AlgPolicy>::next(__first) == __middle) + return std::__rotate_left<_AlgPolicy>(__first, __last); + if (_IterOps<_AlgPolicy>::next(__middle) == __last) + return std::__rotate_right<_AlgPolicy>(__first, __last); + } + return std::__rotate_forward<_AlgPolicy>(__first, __middle, __last); } template <class _AlgPolicy, class _RandomAccessIterator> -inline _LIBCPP_HIDE_FROM_ABI -_LIBCPP_CONSTEXPR_SINCE_CXX14 _RandomAccessIterator -__rotate_impl(_RandomAccessIterator __first, _RandomAccessIterator __middle, _RandomAccessIterator __last, - random_access_iterator_tag) -{ - typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; - if (is_trivially_move_assignable<value_type>::value) - { - if (_IterOps<_AlgPolicy>::next(__first) == __middle) - return std::__rotate_left<_AlgPolicy>(__first, __last); - if (_IterOps<_AlgPolicy>::next(__middle) == __last) - return std::__rotate_right<_AlgPolicy>(__first, __last); - return std::__rotate_gcd<_AlgPolicy>(__first, __middle, __last); - } - return std::__rotate_forward<_AlgPolicy>(__first, __middle, __last); +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 _RandomAccessIterator __rotate_impl( + _RandomAccessIterator __first, + _RandomAccessIterator __middle, + _RandomAccessIterator __last, + random_access_iterator_tag) { + typedef typename iterator_traits<_RandomAccessIterator>::value_type value_type; + if (is_trivially_move_assignable<value_type>::value) { + if (_IterOps<_AlgPolicy>::next(__first) == __middle) + return std::__rotate_left<_AlgPolicy>(__first, __last); + if (_IterOps<_AlgPolicy>::next(__middle) == __last) + return std::__rotate_right<_AlgPolicy>(__first, __last); + return std::__rotate_gcd<_AlgPolicy>(__first, __middle, __last); + } + return std::__rotate_forward<_AlgPolicy>(__first, __middle, __last); } template <class _AlgPolicy, class _Iterator, class _Sentinel> -_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 -pair<_Iterator, _Iterator> +_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_Iterator, _Iterator> __rotate(_Iterator __first, _Iterator __middle, _Sentinel __last) { - using _Ret = pair<_Iterator, _Iterator>; + using _Ret = pair<_Iterator, _Iterator>; _Iterator __last_iter = _IterOps<_AlgPolicy>::next(__middle, __last); if (__first == __middle) - return _Ret(__last_iter, __last_iter); + return _Ret(__last_iter, __last_iter); if (__middle == __last) - return _Ret(std::move(__first), std::move(__last_iter)); + return _Ret(std::move(__first), std::move(__last_iter)); using _IterCategory = typename _IterOps<_AlgPolicy>::template __iterator_category<_Iterator>; - auto __result = std::__rotate_impl<_AlgPolicy>( - std::move(__first), std::move(__middle), __last_iter, _IterCategory()); + auto __result = std::__rotate_impl<_AlgPolicy>(std::move(__first), std::move(__middle), __last_iter, _IterCategory()); return _Ret(std::move(__result), std::move(__last_iter)); } template <class _ForwardIterator> -inline _LIBCPP_HIDE_FROM_ABI -_LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator -rotate(_ForwardIterator __first, _ForwardIterator __middle, _ForwardIterator __last) -{ - return std::__rotate<_ClassicAlgPolicy>( - std::move(__first), std::move(__middle), std::move(__last)).first; +inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _ForwardIterator +rotate(_ForwardIterator __first, _ForwardIterator __middle, _ForwardIterator __last) { + return std::__rotate<_ClassicAlgPolicy>(std::move(__first), std::move(__middle), std::move(__last)).first; } _LIBCPP_END_NAMESPACE_STD |