| // -*- 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___ITERATOR_MOVE_ITERATOR_H |
| #define _LIBCPP___ITERATOR_MOVE_ITERATOR_H |
| |
| #include <__compare/compare_three_way_result.h> |
| #include <__compare/three_way_comparable.h> |
| #include <__concepts/assignable.h> |
| #include <__concepts/convertible_to.h> |
| #include <__concepts/derived_from.h> |
| #include <__concepts/same_as.h> |
| #include <__config> |
| #include <__iterator/concepts.h> |
| #include <__iterator/incrementable_traits.h> |
| #include <__iterator/iter_move.h> |
| #include <__iterator/iter_swap.h> |
| #include <__iterator/iterator_traits.h> |
| #include <__iterator/move_sentinel.h> |
| #include <__iterator/readable_traits.h> |
| #include <__type_traits/conditional.h> |
| #include <__type_traits/enable_if.h> |
| #include <__type_traits/is_assignable.h> |
| #include <__type_traits/is_constructible.h> |
| #include <__type_traits/is_convertible.h> |
| #include <__type_traits/is_reference.h> |
| #include <__type_traits/is_same.h> |
| #include <__type_traits/remove_reference.h> |
| #include <__utility/declval.h> |
| #include <__utility/move.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER >= 20 |
| template<class _Iter, class = void> |
| struct __move_iter_category_base {}; |
| |
| template<class _Iter> |
| requires requires { typename iterator_traits<_Iter>::iterator_category; } |
| struct __move_iter_category_base<_Iter> { |
| using iterator_category = _If< |
| derived_from<typename iterator_traits<_Iter>::iterator_category, random_access_iterator_tag>, |
| random_access_iterator_tag, |
| typename iterator_traits<_Iter>::iterator_category |
| >; |
| }; |
| |
| template<class _Iter, class _Sent> |
| concept __move_iter_comparable = requires { |
| { std::declval<const _Iter&>() == std::declval<_Sent>() } -> convertible_to<bool>; |
| }; |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| template <class _Iter> |
| class _LIBCPP_TEMPLATE_VIS move_iterator |
| #if _LIBCPP_STD_VER >= 20 |
| : public __move_iter_category_base<_Iter> |
| #endif |
| { |
| #if _LIBCPP_STD_VER >= 20 |
| private: |
| _LIBCPP_HIDE_FROM_ABI |
| static constexpr auto __get_iter_concept() { |
| if constexpr (random_access_iterator<_Iter>) { |
| return random_access_iterator_tag{}; |
| } else if constexpr (bidirectional_iterator<_Iter>) { |
| return bidirectional_iterator_tag{}; |
| } else if constexpr (forward_iterator<_Iter>) { |
| return forward_iterator_tag{}; |
| } else { |
| return input_iterator_tag{}; |
| } |
| } |
| #endif // _LIBCPP_STD_VER >= 20 |
| public: |
| #if _LIBCPP_STD_VER >= 20 |
| using iterator_type = _Iter; |
| using iterator_concept = decltype(__get_iter_concept()); |
| // iterator_category is inherited and not always present |
| using value_type = iter_value_t<_Iter>; |
| using difference_type = iter_difference_t<_Iter>; |
| using pointer = _Iter; |
| using reference = iter_rvalue_reference_t<_Iter>; |
| #else |
| typedef _Iter iterator_type; |
| typedef _If< |
| __is_cpp17_random_access_iterator<_Iter>::value, |
| random_access_iterator_tag, |
| typename iterator_traits<_Iter>::iterator_category |
| > iterator_category; |
| typedef typename iterator_traits<iterator_type>::value_type value_type; |
| typedef typename iterator_traits<iterator_type>::difference_type difference_type; |
| typedef iterator_type pointer; |
| |
| typedef typename iterator_traits<iterator_type>::reference __reference; |
| typedef typename conditional< |
| is_reference<__reference>::value, |
| __libcpp_remove_reference_t<__reference>&&, |
| __reference |
| >::type reference; |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| explicit move_iterator(_Iter __i) : __current_(std::move(__i)) {} |
| |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator& operator++() { ++__current_; return *this; } |
| |
| _LIBCPP_DEPRECATED_IN_CXX20 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| pointer operator->() const { return __current_; } |
| |
| #if _LIBCPP_STD_VER >= 20 |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| move_iterator() requires is_constructible_v<_Iter> : __current_() {} |
| |
| template <class _Up> |
| requires (!_IsSame<_Up, _Iter>::value) && convertible_to<const _Up&, _Iter> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| move_iterator(const move_iterator<_Up>& __u) : __current_(__u.base()) {} |
| |
| template <class _Up> |
| requires (!_IsSame<_Up, _Iter>::value) && |
| convertible_to<const _Up&, _Iter> && |
| assignable_from<_Iter&, const _Up&> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| move_iterator& operator=(const move_iterator<_Up>& __u) { |
| __current_ = __u.base(); |
| return *this; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI constexpr const _Iter& base() const & noexcept { return __current_; } |
| _LIBCPP_HIDE_FROM_ABI constexpr _Iter base() && { return std::move(__current_); } |
| |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| reference operator*() const { return ranges::iter_move(__current_); } |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| reference operator[](difference_type __n) const { return ranges::iter_move(__current_ + __n); } |
| |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| auto operator++(int) |
| requires forward_iterator<_Iter> |
| { |
| move_iterator __tmp(*this); ++__current_; return __tmp; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| void operator++(int) { ++__current_; } |
| #else |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator() : __current_() {} |
| |
| template <class _Up, class = __enable_if_t< |
| !is_same<_Up, _Iter>::value && is_convertible<const _Up&, _Iter>::value |
| > > |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator(const move_iterator<_Up>& __u) : __current_(__u.base()) {} |
| |
| template <class _Up, class = __enable_if_t< |
| !is_same<_Up, _Iter>::value && |
| is_convertible<const _Up&, _Iter>::value && |
| is_assignable<_Iter&, const _Up&>::value |
| > > |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator& operator=(const move_iterator<_Up>& __u) { |
| __current_ = __u.base(); |
| return *this; |
| } |
| |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| _Iter base() const { return __current_; } |
| |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| reference operator*() const { return static_cast<reference>(*__current_); } |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| reference operator[](difference_type __n) const { return static_cast<reference>(__current_[__n]); } |
| |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator operator++(int) { move_iterator __tmp(*this); ++__current_; return __tmp; } |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator& operator--() { --__current_; return *this; } |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator operator--(int) { move_iterator __tmp(*this); --__current_; return __tmp; } |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator operator+(difference_type __n) const { return move_iterator(__current_ + __n); } |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator& operator+=(difference_type __n) { __current_ += __n; return *this; } |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator operator-(difference_type __n) const { return move_iterator(__current_ - __n); } |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator& operator-=(difference_type __n) { __current_ -= __n; return *this; } |
| |
| #if _LIBCPP_STD_VER >= 20 |
| template<sentinel_for<_Iter> _Sent> |
| friend _LIBCPP_HIDE_FROM_ABI constexpr |
| bool operator==(const move_iterator& __x, const move_sentinel<_Sent>& __y) |
| requires __move_iter_comparable<_Iter, _Sent> |
| { |
| return __x.base() == __y.base(); |
| } |
| |
| template<sized_sentinel_for<_Iter> _Sent> |
| friend _LIBCPP_HIDE_FROM_ABI constexpr |
| iter_difference_t<_Iter> operator-(const move_sentinel<_Sent>& __x, const move_iterator& __y) |
| { |
| return __x.base() - __y.base(); |
| } |
| |
| template<sized_sentinel_for<_Iter> _Sent> |
| friend _LIBCPP_HIDE_FROM_ABI constexpr |
| iter_difference_t<_Iter> operator-(const move_iterator& __x, const move_sentinel<_Sent>& __y) |
| { |
| return __x.base() - __y.base(); |
| } |
| |
| friend _LIBCPP_HIDE_FROM_ABI constexpr |
| iter_rvalue_reference_t<_Iter> iter_move(const move_iterator& __i) |
| noexcept(noexcept(ranges::iter_move(__i.__current_))) |
| { |
| return ranges::iter_move(__i.__current_); |
| } |
| |
| template<indirectly_swappable<_Iter> _It2> |
| friend _LIBCPP_HIDE_FROM_ABI constexpr |
| void iter_swap(const move_iterator& __x, const move_iterator<_It2>& __y) |
| noexcept(noexcept(ranges::iter_swap(__x.__current_, __y.__current_))) |
| { |
| return ranges::iter_swap(__x.__current_, __y.__current_); |
| } |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| private: |
| template<class _It2> friend class move_iterator; |
| |
| _Iter __current_; |
| }; |
| _LIBCPP_CTAD_SUPPORTED_FOR_TYPE(move_iterator); |
| |
| template <class _Iter1, class _Iter2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| bool operator==(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) |
| { |
| return __x.base() == __y.base(); |
| } |
| |
| #if _LIBCPP_STD_VER <= 17 |
| template <class _Iter1, class _Iter2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| bool operator!=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) |
| { |
| return __x.base() != __y.base(); |
| } |
| #endif // _LIBCPP_STD_VER <= 17 |
| |
| template <class _Iter1, class _Iter2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| bool operator<(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) |
| { |
| return __x.base() < __y.base(); |
| } |
| |
| template <class _Iter1, class _Iter2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| bool operator>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) |
| { |
| return __x.base() > __y.base(); |
| } |
| |
| template <class _Iter1, class _Iter2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| bool operator<=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) |
| { |
| return __x.base() <= __y.base(); |
| } |
| |
| template <class _Iter1, class _Iter2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| bool operator>=(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) |
| { |
| return __x.base() >= __y.base(); |
| } |
| |
| #if _LIBCPP_STD_VER >= 20 |
| template <class _Iter1, three_way_comparable_with<_Iter1> _Iter2> |
| inline _LIBCPP_HIDE_FROM_ABI constexpr |
| auto operator<=>(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) |
| -> compare_three_way_result_t<_Iter1, _Iter2> |
| { |
| return __x.base() <=> __y.base(); |
| } |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| #ifndef _LIBCPP_CXX03_LANG |
| template <class _Iter1, class _Iter2> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| auto operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) |
| -> decltype(__x.base() - __y.base()) |
| { |
| return __x.base() - __y.base(); |
| } |
| #else |
| template <class _Iter1, class _Iter2> |
| inline _LIBCPP_HIDE_FROM_ABI |
| typename move_iterator<_Iter1>::difference_type |
| operator-(const move_iterator<_Iter1>& __x, const move_iterator<_Iter2>& __y) |
| { |
| return __x.base() - __y.base(); |
| } |
| #endif // !_LIBCPP_CXX03_LANG |
| |
| #if _LIBCPP_STD_VER >= 20 |
| template <class _Iter> |
| inline _LIBCPP_HIDE_FROM_ABI constexpr |
| move_iterator<_Iter> operator+(iter_difference_t<_Iter> __n, const move_iterator<_Iter>& __x) |
| requires requires { { __x.base() + __n } -> same_as<_Iter>; } |
| { |
| return __x + __n; |
| } |
| #else |
| template <class _Iter> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator<_Iter> |
| operator+(typename move_iterator<_Iter>::difference_type __n, const move_iterator<_Iter>& __x) |
| { |
| return move_iterator<_Iter>(__x.base() + __n); |
| } |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| template <class _Iter> |
| inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX17 |
| move_iterator<_Iter> |
| make_move_iterator(_Iter __i) |
| { |
| return move_iterator<_Iter>(std::move(__i)); |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___ITERATOR_MOVE_ITERATOR_H |