Restoring authorship annotation for Andrey Khalyavin <halyavin@gmail.com>. Commit 2 of 2.

1 files changed, 441 insertions, 441 deletions

diff --git a/contrib/libs/cxxsupp/libcxx/include/__ranges/transform_view.h b/contrib/libs/cxxsupp/libcxx/include/__ranges/transform_view.h
index 24576aa0ac..de1296cbd2 100644
--- a/contrib/libs/cxxsupp/libcxx/include/__ranges/transform_view.h
+++ b/contrib/libs/cxxsupp/libcxx/include/__ranges/transform_view.h
@@ -1,441 +1,441 @@
-// -*- 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___RANGES_TRANSFORM_VIEW_H 
-#define _LIBCPP___RANGES_TRANSFORM_VIEW_H 
- 
-#include <__compare/three_way_comparable.h> 
-#include <__concepts/constructible.h> 
-#include <__concepts/convertible_to.h> 
-#include <__concepts/copyable.h> 
-#include <__concepts/derived_from.h> 
-#include <__concepts/equality_comparable.h> 
-#include <__concepts/invocable.h> 
-#include <__config> 
-#include <__functional/bind_back.h> 
-#include <__functional/invoke.h> 
-#include <__iterator/concepts.h> 
-#include <__iterator/iter_swap.h> 
-#include <__iterator/iterator_traits.h> 
-#include <__memory/addressof.h> 
-#include <__ranges/access.h> 
-#include <__ranges/all.h> 
-#include <__ranges/concepts.h> 
-#include <__ranges/copyable_box.h> 
-#include <__ranges/empty.h> 
-#include <__ranges/range_adaptor.h> 
-#include <__ranges/size.h> 
-#include <__ranges/view_interface.h> 
-#include <__utility/forward.h> 
-#include <__utility/in_place.h> 
-#include <__utility/move.h> 
-#include <type_traits> 
- 
-#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 
-#pragma GCC system_header 
-#endif 
- 
-_LIBCPP_BEGIN_NAMESPACE_STD 
- 
-#if !defined(_LIBCPP_HAS_NO_RANGES) 
- 
-namespace ranges { 
- 
-template<class _View, class _Fn> 
-concept __transform_view_constraints = 
-           view<_View> && is_object_v<_Fn> && 
-           regular_invocable<_Fn&, range_reference_t<_View>> && 
-           __referenceable<invoke_result_t<_Fn&, range_reference_t<_View>>>; 
- 
-template<input_range _View, copy_constructible _Fn> 
-  requires __transform_view_constraints<_View, _Fn> 
-class transform_view : public view_interface<transform_view<_View, _Fn>> { 
-  template<bool> class __iterator; 
-  template<bool> class __sentinel; 
- 
-  [[no_unique_address]] __copyable_box<_Fn> __func_; 
-  [[no_unique_address]] _View __base_ = _View(); 
- 
-public: 
-  _LIBCPP_HIDE_FROM_ABI 
-  transform_view() 
-    requires default_initializable<_View> && default_initializable<_Fn> = default; 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr transform_view(_View __base, _Fn __func) 
-    : __func_(_VSTD::in_place, _VSTD::move(__func)), __base_(_VSTD::move(__base)) {} 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr _View base() const& requires copy_constructible<_View> { return __base_; } 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr _View base() && { return _VSTD::move(__base_); } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator<false> begin() { 
-    return __iterator<false>{*this, ranges::begin(__base_)}; 
-  } 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator<true> begin() const 
-    requires range<const _View> && 
-             regular_invocable<const _Fn&, range_reference_t<const _View>> 
-  { 
-    return __iterator<true>(*this, ranges::begin(__base_)); 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __sentinel<false> end() { 
-    return __sentinel<false>(ranges::end(__base_)); 
-  } 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator<false> end() 
-    requires common_range<_View> 
-  { 
-    return __iterator<false>(*this, ranges::end(__base_)); 
-  } 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __sentinel<true> end() const 
-    requires range<const _View> && 
-             regular_invocable<const _Fn&, range_reference_t<const _View>> 
-  { 
-    return __sentinel<true>(ranges::end(__base_)); 
-  } 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator<true> end() const 
-    requires common_range<const _View> && 
-             regular_invocable<const _Fn&, range_reference_t<const _View>> 
-  { 
-    return __iterator<true>(*this, ranges::end(__base_)); 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr auto size() requires sized_range<_View> { return ranges::size(__base_); } 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr auto size() const requires sized_range<const _View> { return ranges::size(__base_); } 
-}; 
- 
-template<class _Range, class _Fn> 
-transform_view(_Range&&, _Fn) -> transform_view<views::all_t<_Range>, _Fn>; 
- 
-template<class _View> 
-struct __transform_view_iterator_concept { using type = input_iterator_tag; }; 
- 
-template<random_access_range _View> 
-struct __transform_view_iterator_concept<_View> { using type = random_access_iterator_tag; }; 
- 
-template<bidirectional_range _View> 
-struct __transform_view_iterator_concept<_View> { using type = bidirectional_iterator_tag; }; 
- 
-template<forward_range _View> 
-struct __transform_view_iterator_concept<_View> { using type = forward_iterator_tag; }; 
- 
-template<class, class> 
-struct __transform_view_iterator_category_base {}; 
- 
-template<forward_range _View, class _Fn> 
-struct __transform_view_iterator_category_base<_View, _Fn> { 
-  using _Cat = typename iterator_traits<iterator_t<_View>>::iterator_category; 
- 
-  using iterator_category = conditional_t< 
-    is_lvalue_reference_v<invoke_result_t<_Fn&, range_reference_t<_View>>>, 
-    conditional_t< 
-      derived_from<_Cat, contiguous_iterator_tag>, 
-      random_access_iterator_tag, 
-      _Cat 
-    >, 
-    input_iterator_tag 
-  >; 
-}; 
- 
-template<input_range _View, copy_constructible _Fn> 
-  requires __transform_view_constraints<_View, _Fn> 
-template<bool _Const> 
-class transform_view<_View, _Fn>::__iterator 
-  : public __transform_view_iterator_category_base<_View, _Fn> { 
- 
-  using _Parent = __maybe_const<_Const, transform_view>; 
-  using _Base = __maybe_const<_Const, _View>; 
- 
-  _Parent *__parent_ = nullptr; 
- 
-  template<bool> 
-  friend class transform_view<_View, _Fn>::__iterator; 
- 
-  template<bool> 
-  friend class transform_view<_View, _Fn>::__sentinel; 
- 
-public: 
-  iterator_t<_Base> __current_ = iterator_t<_Base>(); 
- 
-  using iterator_concept = typename __transform_view_iterator_concept<_View>::type; 
-  using value_type = remove_cvref_t<invoke_result_t<_Fn&, range_reference_t<_Base>>>; 
-  using difference_type = range_difference_t<_Base>; 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  __iterator() requires default_initializable<iterator_t<_Base>> = default; 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator(_Parent& __parent, iterator_t<_Base> __current) 
-    : __parent_(_VSTD::addressof(__parent)), __current_(_VSTD::move(__current)) {} 
- 
-  // Note: `__i` should always be `__iterator<false>`, but directly using 
-  // `__iterator<false>` is ill-formed when `_Const` is false 
-  // (see http://wg21.link/class.copy.ctor#5). 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator(__iterator<!_Const> __i) 
-    requires _Const && convertible_to<iterator_t<_View>, iterator_t<_Base>> 
-    : __parent_(__i.__parent_), __current_(_VSTD::move(__i.__current_)) {} 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr iterator_t<_Base> base() const& 
-    requires copyable<iterator_t<_Base>> 
-  { 
-    return __current_; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr iterator_t<_Base> base() && { 
-    return _VSTD::move(__current_); 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr decltype(auto) operator*() const 
-    noexcept(noexcept(_VSTD::invoke(*__parent_->__func_, *__current_))) 
-  { 
-    return _VSTD::invoke(*__parent_->__func_, *__current_); 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator& operator++() { 
-    ++__current_; 
-    return *this; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr void operator++(int) { ++__current_; } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator operator++(int) 
-    requires forward_range<_Base> 
-  { 
-    auto __tmp = *this; 
-    ++*this; 
-    return __tmp; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator& operator--() 
-    requires bidirectional_range<_Base> 
-  { 
-    --__current_; 
-    return *this; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator operator--(int) 
-    requires bidirectional_range<_Base> 
-  { 
-    auto __tmp = *this; 
-    --*this; 
-    return __tmp; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator& operator+=(difference_type __n) 
-    requires random_access_range<_Base> 
-  { 
-    __current_ += __n; 
-    return *this; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __iterator& operator-=(difference_type __n) 
-    requires random_access_range<_Base> 
-  { 
-    __current_ -= __n; 
-    return *this; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr decltype(auto) operator[](difference_type __n) const 
-    noexcept(noexcept(_VSTD::invoke(*__parent_->__func_, __current_[__n]))) 
-    requires random_access_range<_Base> 
-  { 
-    return _VSTD::invoke(*__parent_->__func_, __current_[__n]); 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr bool operator==(const __iterator& __x, const __iterator& __y) 
-    requires equality_comparable<iterator_t<_Base>> 
-  { 
-    return __x.__current_ == __y.__current_; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr bool operator<(const __iterator& __x, const __iterator& __y) 
-    requires random_access_range<_Base> 
-  { 
-    return __x.__current_ < __y.__current_; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr bool operator>(const __iterator& __x, const __iterator& __y) 
-    requires random_access_range<_Base> 
-  { 
-    return __x.__current_ > __y.__current_; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr bool operator<=(const __iterator& __x, const __iterator& __y) 
-    requires random_access_range<_Base> 
-  { 
-    return __x.__current_ <= __y.__current_; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr bool operator>=(const __iterator& __x, const __iterator& __y) 
-    requires random_access_range<_Base> 
-  { 
-    return __x.__current_ >= __y.__current_; 
-  } 
- 
-#if !defined(_LIBCPP_HAS_NO_SPACESHIP_OPERATOR) 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr auto operator<=>(const __iterator& __x, const __iterator& __y) 
-    requires random_access_range<_Base> && three_way_comparable<iterator_t<_Base>> 
-  { 
-    return __x.__current_ <=> __y.__current_; 
-  } 
-#endif // !defined(_LIBCPP_HAS_NO_SPACESHIP_OPERATOR) 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr __iterator operator+(__iterator __i, difference_type __n) 
-    requires random_access_range<_Base> 
-  { 
-    return __iterator{*__i.__parent_, __i.__current_ + __n}; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr __iterator operator+(difference_type __n, __iterator __i) 
-    requires random_access_range<_Base> 
-  { 
-    return __iterator{*__i.__parent_, __i.__current_ + __n}; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr __iterator operator-(__iterator __i, difference_type __n) 
-    requires random_access_range<_Base> 
-  { 
-    return __iterator{*__i.__parent_, __i.__current_ - __n}; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr difference_type operator-(const __iterator& __x, const __iterator& __y) 
-    requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>> 
-  { 
-    return __x.__current_ - __y.__current_; 
-  } 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr decltype(auto) iter_move(const __iterator& __i) 
-    noexcept(noexcept(*__i)) 
-  { 
-    if constexpr (is_lvalue_reference_v<decltype(*__i)>) 
-      return _VSTD::move(*__i); 
-    else 
-      return *__i; 
-  } 
-}; 
- 
-template<input_range _View, copy_constructible _Fn> 
-  requires __transform_view_constraints<_View, _Fn> 
-template<bool _Const> 
-class transform_view<_View, _Fn>::__sentinel { 
-  using _Parent = __maybe_const<_Const, transform_view>; 
-  using _Base = __maybe_const<_Const, _View>; 
- 
-  sentinel_t<_Base> __end_ = sentinel_t<_Base>(); 
- 
-  template<bool> 
-  friend class transform_view<_View, _Fn>::__iterator; 
- 
-  template<bool> 
-  friend class transform_view<_View, _Fn>::__sentinel; 
- 
-public: 
-  _LIBCPP_HIDE_FROM_ABI 
-  __sentinel() = default; 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr explicit __sentinel(sentinel_t<_Base> __end) : __end_(__end) {} 
- 
-  // Note: `__i` should always be `__sentinel<false>`, but directly using 
-  // `__sentinel<false>` is ill-formed when `_Const` is false 
-  // (see http://wg21.link/class.copy.ctor#5). 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr __sentinel(__sentinel<!_Const> __i) 
-    requires _Const && convertible_to<sentinel_t<_View>, sentinel_t<_Base>> 
-    : __end_(_VSTD::move(__i.__end_)) {} 
- 
-  _LIBCPP_HIDE_FROM_ABI 
-  constexpr sentinel_t<_Base> base() const { return __end_; } 
- 
-  template<bool _OtherConst> 
-    requires sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>> 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr bool operator==(const __iterator<_OtherConst>& __x, const __sentinel& __y) { 
-    return __x.__current_ == __y.__end_; 
-  } 
- 
-  template<bool _OtherConst> 
-    requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>> 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr range_difference_t<__maybe_const<_OtherConst, _View>> 
-  operator-(const __iterator<_OtherConst>& __x, const __sentinel& __y) { 
-    return __x.__current_ - __y.__end_; 
-  } 
- 
-  template<bool _OtherConst> 
-    requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>> 
-  _LIBCPP_HIDE_FROM_ABI 
-  friend constexpr range_difference_t<__maybe_const<_OtherConst, _View>> 
-  operator-(const __sentinel& __x, const __iterator<_OtherConst>& __y) { 
-    return __x.__end_ - __y.__current_; 
-  } 
-}; 
- 
-namespace views { 
-namespace __transform { 
-  struct __fn { 
-    template<class _Range, class _Fn> 
-    [[nodiscard]] _LIBCPP_HIDE_FROM_ABI 
-    constexpr auto operator()(_Range&& __range, _Fn&& __f) const 
-      noexcept(noexcept(transform_view(_VSTD::forward<_Range>(__range), _VSTD::forward<_Fn>(__f)))) 
-      -> decltype(      transform_view(_VSTD::forward<_Range>(__range), _VSTD::forward<_Fn>(__f))) 
-      { return          transform_view(_VSTD::forward<_Range>(__range), _VSTD::forward<_Fn>(__f)); } 
- 
-    template<class _Fn> 
-      requires constructible_from<decay_t<_Fn>, _Fn> 
-    [[nodiscard]] _LIBCPP_HIDE_FROM_ABI 
-    constexpr auto operator()(_Fn&& __f) const 
-      noexcept(is_nothrow_constructible_v<decay_t<_Fn>, _Fn>) 
-    { return __range_adaptor_closure_t(_VSTD::__bind_back(*this, _VSTD::forward<_Fn>(__f))); } 
-  }; 
-} 
- 
-inline namespace __cpo { 
-  inline constexpr auto transform = __transform::__fn{}; 
-} 
-} // namespace views 
- 
-} // namespace ranges 
- 
-#endif // !defined(_LIBCPP_HAS_NO_RANGES) 
- 
-_LIBCPP_END_NAMESPACE_STD 
- 
-#endif // _LIBCPP___RANGES_TRANSFORM_VIEW_H 
+// -*- 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___RANGES_TRANSFORM_VIEW_H
+#define _LIBCPP___RANGES_TRANSFORM_VIEW_H
+
+#include <__compare/three_way_comparable.h>
+#include <__concepts/constructible.h>
+#include <__concepts/convertible_to.h>
+#include <__concepts/copyable.h>
+#include <__concepts/derived_from.h>
+#include <__concepts/equality_comparable.h>
+#include <__concepts/invocable.h>
+#include <__config>
+#include <__functional/bind_back.h>
+#include <__functional/invoke.h>
+#include <__iterator/concepts.h>
+#include <__iterator/iter_swap.h>
+#include <__iterator/iterator_traits.h>
+#include <__memory/addressof.h>
+#include <__ranges/access.h>
+#include <__ranges/all.h>
+#include <__ranges/concepts.h>
+#include <__ranges/copyable_box.h>
+#include <__ranges/empty.h>
+#include <__ranges/range_adaptor.h>
+#include <__ranges/size.h>
+#include <__ranges/view_interface.h>
+#include <__utility/forward.h>
+#include <__utility/in_place.h>
+#include <__utility/move.h>
+#include <type_traits>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if !defined(_LIBCPP_HAS_NO_RANGES)
+
+namespace ranges {
+
+template<class _View, class _Fn>
+concept __transform_view_constraints =
+           view<_View> && is_object_v<_Fn> &&
+           regular_invocable<_Fn&, range_reference_t<_View>> &&
+           __referenceable<invoke_result_t<_Fn&, range_reference_t<_View>>>;
+
+template<input_range _View, copy_constructible _Fn>
+  requires __transform_view_constraints<_View, _Fn>
+class transform_view : public view_interface<transform_view<_View, _Fn>> {
+  template<bool> class __iterator;
+  template<bool> class __sentinel;
+
+  [[no_unique_address]] __copyable_box<_Fn> __func_;
+  [[no_unique_address]] _View __base_ = _View();
+
+public:
+  _LIBCPP_HIDE_FROM_ABI
+  transform_view()
+    requires default_initializable<_View> && default_initializable<_Fn> = default;
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr transform_view(_View __base, _Fn __func)
+    : __func_(_VSTD::in_place, _VSTD::move(__func)), __base_(_VSTD::move(__base)) {}
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr _View base() const& requires copy_constructible<_View> { return __base_; }
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr _View base() && { return _VSTD::move(__base_); }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator<false> begin() {
+    return __iterator<false>{*this, ranges::begin(__base_)};
+  }
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator<true> begin() const
+    requires range<const _View> &&
+             regular_invocable<const _Fn&, range_reference_t<const _View>>
+  {
+    return __iterator<true>(*this, ranges::begin(__base_));
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __sentinel<false> end() {
+    return __sentinel<false>(ranges::end(__base_));
+  }
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator<false> end()
+    requires common_range<_View>
+  {
+    return __iterator<false>(*this, ranges::end(__base_));
+  }
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __sentinel<true> end() const
+    requires range<const _View> &&
+             regular_invocable<const _Fn&, range_reference_t<const _View>>
+  {
+    return __sentinel<true>(ranges::end(__base_));
+  }
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator<true> end() const
+    requires common_range<const _View> &&
+             regular_invocable<const _Fn&, range_reference_t<const _View>>
+  {
+    return __iterator<true>(*this, ranges::end(__base_));
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr auto size() requires sized_range<_View> { return ranges::size(__base_); }
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr auto size() const requires sized_range<const _View> { return ranges::size(__base_); }
+};
+
+template<class _Range, class _Fn>
+transform_view(_Range&&, _Fn) -> transform_view<views::all_t<_Range>, _Fn>;
+
+template<class _View>
+struct __transform_view_iterator_concept { using type = input_iterator_tag; };
+
+template<random_access_range _View>
+struct __transform_view_iterator_concept<_View> { using type = random_access_iterator_tag; };
+
+template<bidirectional_range _View>
+struct __transform_view_iterator_concept<_View> { using type = bidirectional_iterator_tag; };
+
+template<forward_range _View>
+struct __transform_view_iterator_concept<_View> { using type = forward_iterator_tag; };
+
+template<class, class>
+struct __transform_view_iterator_category_base {};
+
+template<forward_range _View, class _Fn>
+struct __transform_view_iterator_category_base<_View, _Fn> {
+  using _Cat = typename iterator_traits<iterator_t<_View>>::iterator_category;
+
+  using iterator_category = conditional_t<
+    is_lvalue_reference_v<invoke_result_t<_Fn&, range_reference_t<_View>>>,
+    conditional_t<
+      derived_from<_Cat, contiguous_iterator_tag>,
+      random_access_iterator_tag,
+      _Cat
+    >,
+    input_iterator_tag
+  >;
+};
+
+template<input_range _View, copy_constructible _Fn>
+  requires __transform_view_constraints<_View, _Fn>
+template<bool _Const>
+class transform_view<_View, _Fn>::__iterator
+  : public __transform_view_iterator_category_base<_View, _Fn> {
+
+  using _Parent = __maybe_const<_Const, transform_view>;
+  using _Base = __maybe_const<_Const, _View>;
+
+  _Parent *__parent_ = nullptr;
+
+  template<bool>
+  friend class transform_view<_View, _Fn>::__iterator;
+
+  template<bool>
+  friend class transform_view<_View, _Fn>::__sentinel;
+
+public:
+  iterator_t<_Base> __current_ = iterator_t<_Base>();
+
+  using iterator_concept = typename __transform_view_iterator_concept<_View>::type;
+  using value_type = remove_cvref_t<invoke_result_t<_Fn&, range_reference_t<_Base>>>;
+  using difference_type = range_difference_t<_Base>;
+
+  _LIBCPP_HIDE_FROM_ABI
+  __iterator() requires default_initializable<iterator_t<_Base>> = default;
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator(_Parent& __parent, iterator_t<_Base> __current)
+    : __parent_(_VSTD::addressof(__parent)), __current_(_VSTD::move(__current)) {}
+
+  // Note: `__i` should always be `__iterator<false>`, but directly using
+  // `__iterator<false>` is ill-formed when `_Const` is false
+  // (see http://wg21.link/class.copy.ctor#5).
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator(__iterator<!_Const> __i)
+    requires _Const && convertible_to<iterator_t<_View>, iterator_t<_Base>>
+    : __parent_(__i.__parent_), __current_(_VSTD::move(__i.__current_)) {}
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr iterator_t<_Base> base() const&
+    requires copyable<iterator_t<_Base>>
+  {
+    return __current_;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr iterator_t<_Base> base() && {
+    return _VSTD::move(__current_);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr decltype(auto) operator*() const
+    noexcept(noexcept(_VSTD::invoke(*__parent_->__func_, *__current_)))
+  {
+    return _VSTD::invoke(*__parent_->__func_, *__current_);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator& operator++() {
+    ++__current_;
+    return *this;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr void operator++(int) { ++__current_; }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator operator++(int)
+    requires forward_range<_Base>
+  {
+    auto __tmp = *this;
+    ++*this;
+    return __tmp;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator& operator--()
+    requires bidirectional_range<_Base>
+  {
+    --__current_;
+    return *this;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator operator--(int)
+    requires bidirectional_range<_Base>
+  {
+    auto __tmp = *this;
+    --*this;
+    return __tmp;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator& operator+=(difference_type __n)
+    requires random_access_range<_Base>
+  {
+    __current_ += __n;
+    return *this;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __iterator& operator-=(difference_type __n)
+    requires random_access_range<_Base>
+  {
+    __current_ -= __n;
+    return *this;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr decltype(auto) operator[](difference_type __n) const
+    noexcept(noexcept(_VSTD::invoke(*__parent_->__func_, __current_[__n])))
+    requires random_access_range<_Base>
+  {
+    return _VSTD::invoke(*__parent_->__func_, __current_[__n]);
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr bool operator==(const __iterator& __x, const __iterator& __y)
+    requires equality_comparable<iterator_t<_Base>>
+  {
+    return __x.__current_ == __y.__current_;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr bool operator<(const __iterator& __x, const __iterator& __y)
+    requires random_access_range<_Base>
+  {
+    return __x.__current_ < __y.__current_;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr bool operator>(const __iterator& __x, const __iterator& __y)
+    requires random_access_range<_Base>
+  {
+    return __x.__current_ > __y.__current_;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr bool operator<=(const __iterator& __x, const __iterator& __y)
+    requires random_access_range<_Base>
+  {
+    return __x.__current_ <= __y.__current_;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr bool operator>=(const __iterator& __x, const __iterator& __y)
+    requires random_access_range<_Base>
+  {
+    return __x.__current_ >= __y.__current_;
+  }
+
+#if !defined(_LIBCPP_HAS_NO_SPACESHIP_OPERATOR)
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr auto operator<=>(const __iterator& __x, const __iterator& __y)
+    requires random_access_range<_Base> && three_way_comparable<iterator_t<_Base>>
+  {
+    return __x.__current_ <=> __y.__current_;
+  }
+#endif // !defined(_LIBCPP_HAS_NO_SPACESHIP_OPERATOR)
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr __iterator operator+(__iterator __i, difference_type __n)
+    requires random_access_range<_Base>
+  {
+    return __iterator{*__i.__parent_, __i.__current_ + __n};
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr __iterator operator+(difference_type __n, __iterator __i)
+    requires random_access_range<_Base>
+  {
+    return __iterator{*__i.__parent_, __i.__current_ + __n};
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr __iterator operator-(__iterator __i, difference_type __n)
+    requires random_access_range<_Base>
+  {
+    return __iterator{*__i.__parent_, __i.__current_ - __n};
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr difference_type operator-(const __iterator& __x, const __iterator& __y)
+    requires sized_sentinel_for<iterator_t<_Base>, iterator_t<_Base>>
+  {
+    return __x.__current_ - __y.__current_;
+  }
+
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr decltype(auto) iter_move(const __iterator& __i)
+    noexcept(noexcept(*__i))
+  {
+    if constexpr (is_lvalue_reference_v<decltype(*__i)>)
+      return _VSTD::move(*__i);
+    else
+      return *__i;
+  }
+};
+
+template<input_range _View, copy_constructible _Fn>
+  requires __transform_view_constraints<_View, _Fn>
+template<bool _Const>
+class transform_view<_View, _Fn>::__sentinel {
+  using _Parent = __maybe_const<_Const, transform_view>;
+  using _Base = __maybe_const<_Const, _View>;
+
+  sentinel_t<_Base> __end_ = sentinel_t<_Base>();
+
+  template<bool>
+  friend class transform_view<_View, _Fn>::__iterator;
+
+  template<bool>
+  friend class transform_view<_View, _Fn>::__sentinel;
+
+public:
+  _LIBCPP_HIDE_FROM_ABI
+  __sentinel() = default;
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr explicit __sentinel(sentinel_t<_Base> __end) : __end_(__end) {}
+
+  // Note: `__i` should always be `__sentinel<false>`, but directly using
+  // `__sentinel<false>` is ill-formed when `_Const` is false
+  // (see http://wg21.link/class.copy.ctor#5).
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr __sentinel(__sentinel<!_Const> __i)
+    requires _Const && convertible_to<sentinel_t<_View>, sentinel_t<_Base>>
+    : __end_(_VSTD::move(__i.__end_)) {}
+
+  _LIBCPP_HIDE_FROM_ABI
+  constexpr sentinel_t<_Base> base() const { return __end_; }
+
+  template<bool _OtherConst>
+    requires sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr bool operator==(const __iterator<_OtherConst>& __x, const __sentinel& __y) {
+    return __x.__current_ == __y.__end_;
+  }
+
+  template<bool _OtherConst>
+    requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr range_difference_t<__maybe_const<_OtherConst, _View>>
+  operator-(const __iterator<_OtherConst>& __x, const __sentinel& __y) {
+    return __x.__current_ - __y.__end_;
+  }
+
+  template<bool _OtherConst>
+    requires sized_sentinel_for<sentinel_t<_Base>, iterator_t<__maybe_const<_OtherConst, _View>>>
+  _LIBCPP_HIDE_FROM_ABI
+  friend constexpr range_difference_t<__maybe_const<_OtherConst, _View>>
+  operator-(const __sentinel& __x, const __iterator<_OtherConst>& __y) {
+    return __x.__end_ - __y.__current_;
+  }
+};
+
+namespace views {
+namespace __transform {
+  struct __fn {
+    template<class _Range, class _Fn>
+    [[nodiscard]] _LIBCPP_HIDE_FROM_ABI
+    constexpr auto operator()(_Range&& __range, _Fn&& __f) const
+      noexcept(noexcept(transform_view(_VSTD::forward<_Range>(__range), _VSTD::forward<_Fn>(__f))))
+      -> decltype(      transform_view(_VSTD::forward<_Range>(__range), _VSTD::forward<_Fn>(__f)))
+      { return          transform_view(_VSTD::forward<_Range>(__range), _VSTD::forward<_Fn>(__f)); }
+
+    template<class _Fn>
+      requires constructible_from<decay_t<_Fn>, _Fn>
+    [[nodiscard]] _LIBCPP_HIDE_FROM_ABI
+    constexpr auto operator()(_Fn&& __f) const
+      noexcept(is_nothrow_constructible_v<decay_t<_Fn>, _Fn>)
+    { return __range_adaptor_closure_t(_VSTD::__bind_back(*this, _VSTD::forward<_Fn>(__f))); }
+  };
+}
+
+inline namespace __cpo {
+  inline constexpr auto transform = __transform::__fn{};
+}
+} // namespace views
+
+} // namespace ranges
+
+#endif // !defined(_LIBCPP_HAS_NO_RANGES)
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___RANGES_TRANSFORM_VIEW_H