diff options
Diffstat (limited to 'libcxx/include/__ranges/transform_view.h')
| -rw-r--r-- | libcxx/include/__ranges/transform_view.h | 294 |
1 files changed, 127 insertions, 167 deletions
diff --git a/libcxx/include/__ranges/transform_view.h b/libcxx/include/__ranges/transform_view.h index 3678f9d64f7b..55c6ce587bd6 100644 --- a/libcxx/include/__ranges/transform_view.h +++ b/libcxx/include/__ranges/transform_view.h @@ -53,15 +53,13 @@ _LIBCPP_BEGIN_NAMESPACE_STD namespace ranges { -template<class _Fn, class _View> -concept __regular_invocable_with_range_ref = - regular_invocable<_Fn, range_reference_t<_View>>; +template <class _Fn, class _View> +concept __regular_invocable_with_range_ref = regular_invocable<_Fn, range_reference_t<_View>>; -template<class _View, class _Fn> +template <class _View, class _Fn> concept __transform_view_constraints = - view<_View> && is_object_v<_Fn> && - regular_invocable<_Fn&, range_reference_t<_View>> && - __can_reference<invoke_result_t<_Fn&, range_reference_t<_View>>>; + view<_View> && is_object_v<_Fn> && regular_invocable<_Fn&, range_reference_t<_View>> && + __can_reference<invoke_result_t<_Fn&, range_reference_t<_View>>>; # if _LIBCPP_STD_VER >= 23 template <input_range _View, move_constructible _Fn> @@ -70,100 +68,99 @@ template <input_range _View, copy_constructible _Fn> # endif requires __transform_view_constraints<_View, _Fn> class transform_view : public view_interface<transform_view<_View, _Fn>> { - template<bool> class __iterator; - template<bool> class __sentinel; + template <bool> + class __iterator; + template <bool> + class __sentinel; _LIBCPP_NO_UNIQUE_ADDRESS __movable_box<_Fn> __func_; _LIBCPP_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 transform_view() + requires default_initializable<_View> && default_initializable<_Fn> + = default; - _LIBCPP_HIDE_FROM_ABI - constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 transform_view(_View __base, _Fn __func) - : __func_(std::in_place, std::move(__func)), __base_(std::move(__base)) {} + _LIBCPP_HIDE_FROM_ABI constexpr _LIBCPP_EXPLICIT_SINCE_CXX23 transform_view(_View __base, _Fn __func) + : __func_(std::in_place, std::move(__func)), __base_(std::move(__base)) {} - _LIBCPP_HIDE_FROM_ABI - constexpr _View base() const& requires copy_constructible<_View> { return __base_; } - _LIBCPP_HIDE_FROM_ABI - constexpr _View base() && { return std::move(__base_); } - - _LIBCPP_HIDE_FROM_ABI - constexpr __iterator<false> begin() { - return __iterator<false>{*this, ranges::begin(__base_)}; + _LIBCPP_HIDE_FROM_ABI constexpr _View base() const& + requires copy_constructible<_View> + { + return __base_; } - _LIBCPP_HIDE_FROM_ABI - constexpr __iterator<true> begin() const - requires range<const _View> && - __regular_invocable_with_range_ref<const _Fn&, const _View> + _LIBCPP_HIDE_FROM_ABI constexpr _View base() && { return std::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_with_range_ref<const _Fn&, 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() + _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_with_range_ref<const _Fn&, const _View> + _LIBCPP_HIDE_FROM_ABI constexpr __sentinel<true> end() const + requires range<const _View> && __regular_invocable_with_range_ref<const _Fn&, const _View> { return __sentinel<true>(ranges::end(__base_)); } - _LIBCPP_HIDE_FROM_ABI - constexpr __iterator<true> end() const - requires common_range<const _View> && - __regular_invocable_with_range_ref<const _Fn&, const _View> + _LIBCPP_HIDE_FROM_ABI constexpr __iterator<true> end() const + requires common_range<const _View> && __regular_invocable_with_range_ref<const _Fn&, 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_); } + _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> +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 <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 <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 <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 <forward_range _View> +struct __transform_view_iterator_concept<_View> { + using type = forward_iterator_tag; +}; -template<class, class> +template <class, class> struct __transform_view_iterator_category_base {}; -template<forward_range _View, class _Fn> +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_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 - >; + using iterator_category = + conditional_t< is_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 >; }; # if _LIBCPP_STD_VER >= 23 @@ -176,66 +173,54 @@ 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>; + using _Base = __maybe_const<_Const, _View>; - _Parent *__parent_ = nullptr; + _Parent* __parent_ = nullptr; - template<bool> + template <bool> friend class transform_view<_View, _Fn>::__iterator; - template<bool> + 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>; + 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 __iterator() + requires default_initializable<iterator_t<_Base>> + = default; - _LIBCPP_HIDE_FROM_ABI - constexpr __iterator(_Parent& __parent, iterator_t<_Base> __current) - : __parent_(std::addressof(__parent)), __current_(std::move(__current)) {} + _LIBCPP_HIDE_FROM_ABI constexpr __iterator(_Parent& __parent, iterator_t<_Base> __current) + : __parent_(std::addressof(__parent)), __current_(std::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) + _LIBCPP_HIDE_FROM_ABI constexpr __iterator(__iterator<!_Const> __i) requires _Const && convertible_to<iterator_t<_View>, iterator_t<_Base>> - : __parent_(__i.__parent_), __current_(std::move(__i.__current_)) {} + : __parent_(__i.__parent_), __current_(std::move(__i.__current_)) {} - _LIBCPP_HIDE_FROM_ABI - constexpr const iterator_t<_Base>& base() const& noexcept { - return __current_; - } + _LIBCPP_HIDE_FROM_ABI constexpr const iterator_t<_Base>& base() const& noexcept { return __current_; } - _LIBCPP_HIDE_FROM_ABI - constexpr iterator_t<_Base> base() && { - return std::move(__current_); - } + _LIBCPP_HIDE_FROM_ABI constexpr iterator_t<_Base> base() && { return std::move(__current_); } - _LIBCPP_HIDE_FROM_ABI - constexpr decltype(auto) operator*() const - noexcept(noexcept(std::invoke(*__parent_->__func_, *__current_))) - { + _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) operator*() const + noexcept(noexcept(std::invoke(*__parent_->__func_, *__current_))) { return std::invoke(*__parent_->__func_, *__current_); } - _LIBCPP_HIDE_FROM_ABI - constexpr __iterator& operator++() { + _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator++() { ++__current_; return *this; } - _LIBCPP_HIDE_FROM_ABI - constexpr void operator++(int) { ++__current_; } + _LIBCPP_HIDE_FROM_ABI constexpr void operator++(int) { ++__current_; } - _LIBCPP_HIDE_FROM_ABI - constexpr __iterator operator++(int) + _LIBCPP_HIDE_FROM_ABI constexpr __iterator operator++(int) requires forward_range<_Base> { auto __tmp = *this; @@ -243,16 +228,14 @@ public: return __tmp; } - _LIBCPP_HIDE_FROM_ABI - constexpr __iterator& operator--() + _LIBCPP_HIDE_FROM_ABI constexpr __iterator& operator--() requires bidirectional_range<_Base> { --__current_; return *this; } - _LIBCPP_HIDE_FROM_ABI - constexpr __iterator operator--(int) + _LIBCPP_HIDE_FROM_ABI constexpr __iterator operator--(int) requires bidirectional_range<_Base> { auto __tmp = *this; @@ -260,104 +243,88 @@ public: return __tmp; } - _LIBCPP_HIDE_FROM_ABI - constexpr __iterator& operator+=(difference_type __n) + _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) + _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(std::invoke(*__parent_->__func_, __current_[__n]))) + _LIBCPP_HIDE_FROM_ABI constexpr decltype(auto) operator[](difference_type __n) const + noexcept(noexcept(std::invoke(*__parent_->__func_, __current_[__n]))) requires random_access_range<_Base> { return std::invoke(*__parent_->__func_, __current_[__n]); } - _LIBCPP_HIDE_FROM_ABI - friend constexpr bool operator==(const __iterator& __x, const __iterator& __y) + _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) + _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) + _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) + _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) + _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 auto operator<=>(const __iterator& __x, const __iterator& __y) + _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_; } - _LIBCPP_HIDE_FROM_ABI - friend constexpr __iterator operator+(__iterator __i, difference_type __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 __iterator operator+(difference_type __n, __iterator __i) + _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) + _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) + _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)) - { + _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 std::move(*__i); else @@ -374,53 +341,46 @@ template <input_range _View, copy_constructible _Fn> template <bool _Const> class transform_view<_View, _Fn>::__sentinel { using _Parent = __maybe_const<_Const, transform_view>; - using _Base = __maybe_const<_Const, _View>; + using _Base = __maybe_const<_Const, _View>; sentinel_t<_Base> __end_ = sentinel_t<_Base>(); - template<bool> + template <bool> friend class transform_view<_View, _Fn>::__iterator; - template<bool> + template <bool> friend class transform_view<_View, _Fn>::__sentinel; public: - _LIBCPP_HIDE_FROM_ABI - __sentinel() = default; + _LIBCPP_HIDE_FROM_ABI __sentinel() = default; - _LIBCPP_HIDE_FROM_ABI - constexpr explicit __sentinel(sentinel_t<_Base> __end) : __end_(__end) {} + _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) + _LIBCPP_HIDE_FROM_ABI constexpr __sentinel(__sentinel<!_Const> __i) requires _Const && convertible_to<sentinel_t<_View>, sentinel_t<_Base>> - : __end_(std::move(__i.__end_)) {} + : __end_(std::move(__i.__end_)) {} - _LIBCPP_HIDE_FROM_ABI - constexpr sentinel_t<_Base> base() const { return __end_; } + _LIBCPP_HIDE_FROM_ABI constexpr sentinel_t<_Base> base() const { return __end_; } - template<bool _OtherConst> + 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) { + _LIBCPP_HIDE_FROM_ABI friend constexpr bool operator==(const __iterator<_OtherConst>& __x, const __sentinel& __y) { return __x.__current_ == __y.__end_; } - template<bool _OtherConst> + 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>> + _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> + 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>> + _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_; } @@ -428,25 +388,25 @@ public: namespace views { namespace __transform { - struct __fn { - template<class _Range, class _Fn> - [[nodiscard]] _LIBCPP_HIDE_FROM_ABI - constexpr auto operator()(_Range&& __range, _Fn&& __f) const +struct __fn { + template <class _Range, class _Fn> + [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr auto operator()(_Range&& __range, _Fn&& __f) const noexcept(noexcept(transform_view(std::forward<_Range>(__range), std::forward<_Fn>(__f)))) - -> decltype( transform_view(std::forward<_Range>(__range), std::forward<_Fn>(__f))) - { return transform_view(std::forward<_Range>(__range), std::forward<_Fn>(__f)); } + -> decltype(transform_view(std::forward<_Range>(__range), std::forward<_Fn>(__f))) { + return transform_view(std::forward<_Range>(__range), std::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(std::__bind_back(*this, std::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(std::__bind_back(*this, std::forward<_Fn>(__f))); + } +}; } // namespace __transform inline namespace __cpo { - inline constexpr auto transform = __transform::__fn{}; +inline constexpr auto transform = __transform::__fn{}; } // namespace __cpo } // namespace views |