25 Ranges library [ranges]

25.2 Header <ranges> synopsis [ranges.syn]

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#include <compare> // see [compare.syn] #include <initializer_list> // see [initializer.list.syn] #include <iterator> // see [iterator.synopsis] namespace std::ranges { inline namespace unspecified { // [range.access], range access inline constexpr unspecified begin = unspecified; // freestanding inline constexpr unspecified end = unspecified; // freestanding inline constexpr unspecified cbegin = unspecified; // freestanding inline constexpr unspecified cend = unspecified; // freestanding inline constexpr unspecified rbegin = unspecified; // freestanding inline constexpr unspecified rend = unspecified; // freestanding inline constexpr unspecified crbegin = unspecified; // freestanding inline constexpr unspecified crend = unspecified; // freestanding inline constexpr unspecified size = unspecified; // freestanding inline constexpr unspecified ssize = unspecified; // freestanding inline constexpr unspecified empty = unspecified; // freestanding inline constexpr unspecified data = unspecified; // freestanding inline constexpr unspecified cdata = unspecified; // freestanding } // [range.range], ranges template<class T> concept range = see below; // freestanding template<class T> constexpr bool enable_borrowed_range = false; // freestanding template<class T> concept borrowed_range = see below; // freestanding template<class T> using iterator_t = decltype(ranges::begin(declval<T&>())); // freestanding template<range R> using sentinel_t = decltype(ranges::end(declval<R&>())); // freestanding template<range R> using const_iterator_t = decltype(ranges::cbegin(declval<R&>())); // freestanding template<range R> using const_sentinel_t = decltype(ranges::cend(declval<R&>())); // freestanding template<range R> using range_difference_t = iter_difference_t<iterator_t<R>>; // freestanding template<sized_range R> using range_size_t = decltype(ranges::size(declval<R&>())); // freestanding template<range R> using range_value_t = iter_value_t<iterator_t<R>>; // freestanding template<range R> using range_reference_t = iter_reference_t<iterator_t<R>>; // freestanding template<range R> using range_const_reference_t = iter_const_reference_t<iterator_t<R>>; // freestanding template<range R> using range_rvalue_reference_t = iter_rvalue_reference_t<iterator_t<R>>; // freestanding template<range R> using range_common_reference_t = iter_common_reference_t<iterator_t<R>>; // freestanding // [range.sized], sized ranges template<class> constexpr bool disable_sized_range = false; // freestanding template<class T> concept sized_range = see below; // freestanding // [range.view], views template<class T> constexpr bool enable_view = see below; // freestanding struct view_base {}; // freestanding template<class T> concept view = see below; // freestanding // [range.refinements], other range refinements template<class R, class T> concept output_range = see below; // freestanding template<class T> concept input_range = see below; // freestanding template<class T> concept forward_range = see below; // freestanding template<class T> concept bidirectional_range = see below; // freestanding template<class T> concept random_access_range = see below; // freestanding template<class T> concept contiguous_range = see below; // freestanding template<class T> concept common_range = see below; // freestanding template<class T> concept viewable_range = see below; // freestanding template<class T> concept constant_range = see below; // freestanding // [view.interface], class template view_interface template<class D> requires is_class_v<D> && same_as<D, remove_cv_t<D>> class view_interface; // freestanding // [range.subrange], sub-ranges enum class subrange_kind : bool { unsized, sized }; // freestanding template<input_or_output_iterator I, sentinel_for<I> S = I, subrange_kind K = see below> requires (K == subrange_kind::sized || !sized_sentinel_for<S, I>) class subrange; // freestanding template<class I, class S, subrange_kind K> constexpr bool enable_borrowed_range<subrange<I, S, K>> = true; // freestanding template<size_t N, class I, class S, subrange_kind K> requires ((N == 0 && copyable<I>) || N == 1) constexpr auto get(const subrange<I, S, K>& r); // freestanding template<size_t N, class I, class S, subrange_kind K> requires (N < 2) constexpr auto get(subrange<I, S, K>&& r); // freestanding } namespace std { using ranges::get; // freestanding } namespace std::ranges { // [range.dangling], dangling iterator handling struct dangling; // freestanding // [range.elementsof], class template elements_of template<range R, class Allocator = allocator<byte>> struct elements_of; template<range R> using borrowed_iterator_t = see below; // freestanding template<range R> using borrowed_subrange_t = see below; // freestanding // [range.utility.conv], range conversions template<class C, input_range R, class... Args> requires (!view<C>) constexpr C to(R&& r, Args&&... args); // freestanding template<template<class...> class C, input_range R, class... Args> constexpr auto to(R&& r, Args&&... args); // freestanding template<class C, class... Args> requires (!view<C>) constexpr auto to(Args&&... args); // freestanding template<template<class...> class C, class... Args> constexpr auto to(Args&&... args); // freestanding // [range.empty], empty view template<class T> requires is_object_v<T> class empty_view; // freestanding template<class T> constexpr bool enable_borrowed_range<empty_view<T>> = true; // freestanding namespace views { template<class T> constexpr empty_view<T> empty{}; // freestanding } // [range.single], single view template<move_constructible T> requires is_object_v<T> class single_view; // freestanding namespace views { inline constexpr unspecified single = unspecified; } // freestanding template<bool Const, class T> using maybe-const = conditional_t<Const, const T, T>; // exposition only // [range.iota], iota view template<weakly_incrementable W, semiregular Bound = unreachable_sentinel_t> requires weakly-equality-comparable-with<W, Bound> && copyable<W> class iota_view; // freestanding template<class W, class Bound> constexpr bool enable_borrowed_range<iota_view<W, Bound>> = true; // freestanding namespace views { inline constexpr unspecified iota = unspecified; } // freestanding // [range.repeat], repeat view template<move_constructible T, semiregular Bound = unreachable_sentinel_t> requires see below class repeat_view; // freestanding namespace views { inline constexpr unspecified repeat = unspecified; } // freestanding // [range.istream], istream view template<movable Val, class CharT, class Traits = char_traits<CharT>> requires see below class basic_istream_view; template<class Val> using istream_view = basic_istream_view<Val, char>; template<class Val> using wistream_view = basic_istream_view<Val, wchar_t>; namespace views { template<class T> constexpr unspecified istream = unspecified; } // [range.adaptor.object], range adaptor objects template<class D> requires is_class_v<D> && same_as<D, remove_cv_t<D>> class range_adaptor_closure { }; // freestanding // [range.all], all view namespace views { inline constexpr unspecified all = unspecified; // freestanding template<viewable_range R> using all_t = decltype(all(declval<R>())); // freestanding } // [range.ref.view], ref view template<range R> requires is_object_v<R> class ref_view; // freestanding template<class T> constexpr bool enable_borrowed_range<ref_view<T>> = true; // freestanding // [range.owning.view], owning view template<range R> requires see below class owning_view; // freestanding template<class T> constexpr bool enable_borrowed_range<owning_view<T>> = // freestanding enable_borrowed_range<T>; // [range.as.rvalue], as rvalue view template<view V> requires input_range<V> class as_rvalue_view; // freestanding template<class T> constexpr bool enable_borrowed_range<as_rvalue_view<T>> = // freestanding enable_borrowed_range<T>; namespace views { inline constexpr unspecified as_rvalue = unspecified; } // freestanding // [range.filter], filter view template<input_range V, indirect_unary_predicate<iterator_t<V>> Pred> requires view<V> && is_object_v<Pred> class filter_view; // freestanding namespace views { inline constexpr unspecified filter = unspecified; } // freestanding // [range.transform], transform view template<input_range V, move_constructible F> requires view<V> && is_object_v<F> && regular_invocable<F&, range_reference_t<V>> && can-reference<invoke_result_t<F&, range_reference_t<V>>> class transform_view; // freestanding namespace views { inline constexpr unspecified transform = unspecified; } // freestanding // [range.take], take view template<view> class take_view; // freestanding template<class T> constexpr bool enable_borrowed_range<take_view<T>> = // freestanding enable_borrowed_range<T>; namespace views { inline constexpr unspecified take = unspecified; } // freestanding // [range.take.while], take while view template<view V, class Pred> requires input_range<V> && is_object_v<Pred> && indirect_unary_predicate<const Pred, iterator_t<V>> class take_while_view; // freestanding namespace views { inline constexpr unspecified take_while = unspecified; } // freestanding // [range.drop], drop view template<view V> class drop_view; // freestanding template<class T> constexpr bool enable_borrowed_range<drop_view<T>> = // freestanding enable_borrowed_range<T>; namespace views { inline constexpr unspecified drop = unspecified; } // freestanding // [range.drop.while], drop while view template<view V, class Pred> requires input_range<V> && is_object_v<Pred> && indirect_unary_predicate<const Pred, iterator_t<V>> class drop_while_view; // freestanding template<class T, class Pred> constexpr bool enable_borrowed_range<drop_while_view<T, Pred>> = // freestanding enable_borrowed_range<T>; namespace views { inline constexpr unspecified drop_while = unspecified; } // freestanding // [range.join], join view template<input_range V> requires view<V> && input_range<range_reference_t<V>> class join_view; // freestanding namespace views { inline constexpr unspecified join = unspecified; } // freestanding // [range.join.with], join with view template<input_range V, forward_range Pattern> requires see below class join_with_view; // freestanding namespace views { inline constexpr unspecified join_with = unspecified; } // freestanding // [range.lazy.split], lazy split view template<class R> concept tiny-range = see below; // exposition only template<input_range V, forward_range Pattern> requires view<V> && view<Pattern> && indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> && (forward_range<V> || tiny-range<Pattern>) class lazy_split_view; // freestanding // [range.split], split view template<forward_range V, forward_range Pattern> requires view<V> && view<Pattern> && indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> class split_view; // freestanding namespace views { inline constexpr unspecified lazy_split = unspecified; // freestanding inline constexpr unspecified split = unspecified; // freestanding } // [range.concat], concat view template<input_range... Views> requires see below class concat_view; // freestanding namespace views { inline constexpr unspecified concat = unspecified; } // freestanding // [range.counted], counted view namespace views { inline constexpr unspecified counted = unspecified; } // freestanding // [range.common], common view template<view V> requires (!common_range<V> && copyable<iterator_t<V>>) class common_view; // freestanding template<class T> constexpr bool enable_borrowed_range<common_view<T>> = // freestanding enable_borrowed_range<T>; namespace views { inline constexpr unspecified common = unspecified; } // freestanding // [range.reverse], reverse view template<view V> requires bidirectional_range<V> class reverse_view; // freestanding template<class T> constexpr bool enable_borrowed_range<reverse_view<T>> = // freestanding enable_borrowed_range<T>; namespace views { inline constexpr unspecified reverse = unspecified; } // freestanding // [range.as.const], as const view template<input_range R> constexpr auto& possibly-const-range(R& r) noexcept { // exposition only if constexpr (constant_range<const R> && !constant_range<R>) { return const_cast<const R&>(r); } else { return r; } } template<view V> requires input_range<V> class as_const_view; // freestanding template<class T> constexpr bool enable_borrowed_range<as_const_view<T>> = // freestanding enable_borrowed_range<T>; namespace views { inline constexpr unspecified as_const = unspecified; } // freestanding // [range.elements], elements view template<input_range V, size_t N> requires see below class elements_view; // freestanding template<class T, size_t N> constexpr bool enable_borrowed_range<elements_view<T, N>> = // freestanding enable_borrowed_range<T>; template<class R> using keys_view = elements_view<R, 0>; // freestanding template<class R> using values_view = elements_view<R, 1>; // freestanding namespace views { template<size_t N> constexpr unspecified elements = unspecified; // freestanding inline constexpr auto keys = elements<0>; // freestanding inline constexpr auto values = elements<1>; // freestanding } // [range.enumerate], enumerate view template<view V> requires see below class enumerate_view; // freestanding template<class View> constexpr bool enable_borrowed_range<enumerate_view<View>> = // freestanding enable_borrowed_range<View>; namespace views { inline constexpr unspecified enumerate = unspecified; } // freestanding // [range.zip], zip view template<input_range... Views> requires (view<Views> && ...) && (sizeof...(Views) > 0) class zip_view; // freestanding template<class... Views> constexpr bool enable_borrowed_range<zip_view<Views...>> = // freestanding (enable_borrowed_range<Views> && ...); namespace views { inline constexpr unspecified zip = unspecified; } // freestanding // [range.zip.transform], zip transform view template<move_constructible F, input_range... Views> requires (view<Views> && ...) && (sizeof...(Views) > 0) && is_object_v<F> && regular_invocable<F&, range_reference_t<Views>...> && can-reference<invoke_result_t<F&, range_reference_t<Views>...>> class zip_transform_view; // freestanding namespace views { inline constexpr unspecified zip_transform = unspecified; } // freestanding // [range.adjacent], adjacent view template<forward_range V, size_t N> requires view<V> && (N > 0) class adjacent_view; // freestanding template<class V, size_t N> constexpr bool enable_borrowed_range<adjacent_view<V, N>> = // freestanding enable_borrowed_range<V>; namespace views { template<size_t N> constexpr unspecified adjacent = unspecified; // freestanding inline constexpr auto pairwise = adjacent<2>; // freestanding } // [range.adjacent.transform], adjacent transform view template<forward_range V, move_constructible F, size_t N> requires see below class adjacent_transform_view; // freestanding namespace views { template<size_t N> constexpr unspecified adjacent_transform = unspecified; // freestanding inline constexpr auto pairwise_transform = adjacent_transform<2>; // freestanding } // [range.chunk], chunk view template<view V> requires input_range<V> class chunk_view; // freestanding template<view V> requires forward_range<V> class chunk_view<V>; // freestanding template<class V> constexpr bool enable_borrowed_range<chunk_view<V>> = // freestanding forward_range<V> && enable_borrowed_range<V>; namespace views { inline constexpr unspecified chunk = unspecified; } // freestanding // [range.slide], slide view template<forward_range V> requires view<V> class slide_view; // freestanding template<class V> constexpr bool enable_borrowed_range<slide_view<V>> = // freestanding enable_borrowed_range<V>; namespace views { inline constexpr unspecified slide = unspecified; } // freestanding // [range.chunk.by], chunk by view template<forward_range V, indirect_binary_predicate<iterator_t<V>, iterator_t<V>> Pred> requires view<V> && is_object_v<Pred> class chunk_by_view; // freestanding namespace views { inline constexpr unspecified chunk_by = unspecified; } // freestanding // [range.stride], stride view template<input_range V> requires view<V> class stride_view; // freestanding template<class V> constexpr bool enable_borrowed_range<stride_view<V>> = // freestanding enable_borrowed_range<V>; namespace views { inline constexpr unspecified stride = unspecified; } // freestanding // [range.cartesian], cartesian product view template<input_range First, forward_range... Vs> requires (view<First> && ... && view<Vs>) class cartesian_product_view; // freestanding namespace views { inline constexpr unspecified cartesian_product = unspecified; } // freestanding } namespace std { namespace views = ranges::views; // freestanding template<class T> struct tuple_size; // freestanding template<size_t I, class T> struct tuple_element; // freestanding template<class I, class S, ranges::subrange_kind K> struct tuple_size<ranges::subrange<I, S, K>> // freestanding : integral_constant<size_t, 2> {}; template<class I, class S, ranges::subrange_kind K> struct tuple_element<0, ranges::subrange<I, S, K>> { // freestanding using type = I; }; template<class I, class S, ranges::subrange_kind K> struct tuple_element<1, ranges::subrange<I, S, K>> { // freestanding using type = S; }; template<class I, class S, ranges::subrange_kind K> struct tuple_element<0, const ranges::subrange<I, S, K>> { // freestanding using type = I; }; template<class I, class S, ranges::subrange_kind K> struct tuple_element<1, const ranges::subrange<I, S, K>> { // freestanding using type = S; }; struct from_range_t { explicit from_range_t() = default; }; // freestanding inline constexpr from_range_t from_range{}; // freestanding }
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Within this Clause, for an integer-like type X ([iterator.concept.winc]), make-unsigned-like-t<X> denotes make_unsigned_t<X> if X is an integer type; otherwise, it denotes a corresponding unspecified unsigned-integer-like type of the same width as X.
For an expression x of type X, to-unsigned-like(x) is x explicitly converted to make-unsigned-like-t<X>.
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Also within this Clause, make-signed-like-t<X> for an integer-like type X denotes make_signed_t<X> if X is an integer type; otherwise, it denotes a corresponding unspecified signed-integer-like type of the same width as X.