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cppdraft/range/slide/overview.md

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+[range.slide.overview]
+
+# 25 Ranges library [[ranges]](./#ranges)
+
+## 25.7 Range adaptors [[range.adaptors]](range.adaptors#range.slide.overview)
+
+### 25.7.30 Slide view [[range.slide]](range.slide#overview)
+
+#### 25.7.30.1 Overview [range.slide.overview]
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L14872)
+
+slide_view takes a view and a number N and
+produces a view
+whose Mth element is a view over
+the Mth through(M+N−1)th elements
+of the original view[.](#1.sentence-1)
+
+If the original view has fewer than N elements,
+the resulting view is empty[.](#1.sentence-2)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L14882)
+
+The name views​::​slide denotes
+a range adaptor object ([[range.adaptor.object]](range.adaptor.object "25.7.2 Range adaptor objects"))[.](#2.sentence-1)
+
+Given subexpressions E and N,
+the expression views​::​slide(E, N) is expression-equivalent toslide_view(E, N)[.](#2.sentence-2)
+
+[*Example [1](#example-1)*: vector v = {1, 2, 3, 4};
+
+for (auto i : v | views::slide(2)) { cout << '[' << i[0] << ", " << i[1] << "] "; // prints [1, 2] [2, 3] [3, 4]} — *end example*]

cppdraft/range/slide/sentinel.md

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+[range.slide.sentinel]
+
+# 25 Ranges library [[ranges]](./#ranges)
+
+## 25.7 Range adaptors [[range.adaptors]](range.adaptors#range.slide.sentinel)
+
+### 25.7.30 Slide view [[range.slide]](range.slide#sentinel)
+
+#### 25.7.30.4 Class slide_view​::​*sentinel* [range.slide.sentinel]
+
+[🔗](#lib:slide_view::sentinel)
+
+namespace std::ranges {template<[forward_range](range.refinements#concept:forward_range "25.4.6 Other range refinements [range.refinements]") V>requires [view](range.view#concept:view "25.4.5 Views [range.view]")<V>class slide_view<V>::*sentinel* { sentinel_t<V> *end_* = sentinel_t<V>(); // *exposition only*constexpr explicit *sentinel*(sentinel_t<V> end); // *exposition only*public:*sentinel*() = default; friend constexpr bool operator==(const *iterator*<false>& x, const *sentinel*& y); friend constexpr range_difference_t<V>operator-(const *iterator*<false>& x, const *sentinel*& y)requires [sized_sentinel_for](iterator.concept.sizedsentinel#concept:sized_sentinel_for "24.3.4.8 Concept sized_­sentinel_­for [iterator.concept.sizedsentinel]")<sentinel_t<V>, iterator_t<V>>; friend constexpr range_difference_t<V>operator-(const *sentinel*& y, const *iterator*<false>& x)requires [sized_sentinel_for](iterator.concept.sizedsentinel#concept:sized_sentinel_for "24.3.4.8 Concept sized_­sentinel_­for [iterator.concept.sizedsentinel]")<sentinel_t<V>, iterator_t<V>>; };}
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15524)
+
+[*Note [1](#note-1)*:
+
+*sentinel* is used
+only when [*slide-caches-first*](range.slide.view#concept:slide-caches-first "25.7.30.2 Class template slide_­view [range.slide.view]")<V> is true[.](#1.sentence-1)
+
+— *end note*]
+
+[🔗](#lib:slide_view::sentinel,constructor)
+
+`constexpr explicit sentinel(sentinel_t<V> end);
+`
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15536)
+
+*Effects*: Initializes *end_* with end[.](#2.sentence-1)
+
+[🔗](#lib:operator==,slide_view::sentinel)
+
+`friend constexpr bool operator==(const iterator<false>& x, const sentinel& y);
+`
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15547)
+
+*Returns*: x.*last_ele_* == y.*end_*[.](#3.sentence-1)
+
+[🔗](#lib:operator-,slide_view::sentinel)
+
+`friend constexpr range_difference_t<V>
+  operator-(const iterator<false>& x, const sentinel& y)
+    requires [sized_sentinel_for](iterator.concept.sizedsentinel#concept:sized_sentinel_for "24.3.4.8 Concept sized_­sentinel_­for [iterator.concept.sizedsentinel]")<sentinel_t<V>, iterator_t<V>>;
+`
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15560)
+
+*Returns*: x.*last_ele_* - y.*end_*[.](#4.sentence-1)
+
+[🔗](#lib:operator-,slide_view::sentinel_)
+
+`friend constexpr range_difference_t<V>
+  operator-(const sentinel& y, const iterator<false>& x)
+    requires [sized_sentinel_for](iterator.concept.sizedsentinel#concept:sized_sentinel_for "24.3.4.8 Concept sized_­sentinel_­for [iterator.concept.sizedsentinel]")<sentinel_t<V>, iterator_t<V>>;
+`
+
+[5](#5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15573)
+
+*Returns*: y.*end_* - x.*last_ele_*[.](#5.sentence-1)

cppdraft/range/slide/view.md

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+[range.slide.view]
+
+# 25 Ranges library [[ranges]](./#ranges)
+
+## 25.7 Range adaptors [[range.adaptors]](range.adaptors#range.slide.view)
+
+### 25.7.30 Slide view [[range.slide]](range.slide#view)
+
+#### 25.7.30.2 Class template slide_view [range.slide.view]
+
+[🔗](#lib:slide_view)
+
+namespace std::ranges {template<class V>concept [*slide-caches-nothing*](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]") = [random_access_range](range.refinements#concept:random_access_range "25.4.6 Other range refinements [range.refinements]")<V> && [sized_range](range.sized#concept:sized_range "25.4.4 Sized ranges [range.sized]")<V>; // *exposition only*template<class V>concept [*slide-caches-last*](#concept:slide-caches-last "25.7.30.2 Class template slide_­view [range.slide.view]") = // *exposition only*![*slide-caches-nothing*](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<V> && [bidirectional_range](range.refinements#concept:bidirectional_range "25.4.6 Other range refinements [range.refinements]")<V> && [common_range](range.refinements#concept:common_range "25.4.6 Other range refinements [range.refinements]")<V>; template<class V>concept [*slide-caches-first*](#concept:slide-caches-first "25.7.30.2 Class template slide_­view [range.slide.view]") = // *exposition only*![*slide-caches-nothing*](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<V> && ![*slide-caches-last*](#concept:slide-caches-last "25.7.30.2 Class template slide_­view [range.slide.view]")<V>; template<[forward_range](range.refinements#concept:forward_range "25.4.6 Other range refinements [range.refinements]") V>requires [view](range.view#concept:view "25.4.5 Views [range.view]")<V>class slide_view : public view_interface<slide_view<V>> { V *base_*; // *exposition only* range_difference_t<V> *n_*; // *exposition only*// [[range.slide.iterator]](range.slide.iterator "25.7.30.3 Class template slide_­view​::​iterator"), class template slide_view​::​*iterator*template<bool> class *iterator*; // *exposition only*// [[range.slide.sentinel]](range.slide.sentinel "25.7.30.4 Class slide_­view​::​sentinel"), class slide_view​::​*sentinel*class *sentinel*; // *exposition only*public:constexpr explicit slide_view(V base, range_difference_t<V> n); constexpr V base() const & requires [copy_constructible](concept.copyconstructible#concept:copy_constructible "18.4.14 Concept copy_­constructible [concept.copyconstructible]")<V> { return *base_*; }constexpr V base() && { return std::move(*base_*); }constexpr auto begin()requires (!([*simple-view*](range.utility.helpers#concept:simple-view "25.5.2 Helper concepts [range.utility.helpers]")<V> && [*slide-caches-nothing*](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<const V>)); constexpr auto begin() const requires [*slide-caches-nothing*](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<const V>; constexpr auto end()requires (!([*simple-view*](range.utility.helpers#concept:simple-view "25.5.2 Helper concepts [range.utility.helpers]")<V> && [*slide-caches-nothing*](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<const V>)); constexpr auto end() const requires [*slide-caches-nothing*](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<const V>; constexpr auto size() requires [sized_range](range.sized#concept:sized_range "25.4.4 Sized ranges [range.sized]")<V>; constexpr auto size() const requires [sized_range](range.sized#concept:sized_range "25.4.4 Sized ranges [range.sized]")<const V>; constexpr auto reserve_hintsize() requires [approximately_sized_range](range.approximately.sized#concept:approximately_sized_range "25.4.3 Approximately sized ranges [range.approximately.sized]")<V>; constexpr auto reserve_hintsize() const requires [approximately_sized_range](range.approximately.sized#concept:approximately_sized_range "25.4.3 Approximately sized ranges [range.approximately.sized]")<const V>; }; template<class R> slide_view(R&&, range_difference_t<R>) -> slide_view<views::all_t<R>>;}
+
+[🔗](#lib:slide_view,constructor_)
+
+`constexpr explicit slide_view(V base, range_difference_t<V> n);
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L14960)
+
+*Preconditions*: n > 0 is true[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L14964)
+
+*Effects*: Initializes *base_* with std​::​move(base) and*n_* with n[.](#2.sentence-1)
+
+[🔗](#lib:begin,slide_view)
+
+`constexpr auto begin()
+  requires (!([simple-view](range.utility.helpers#concept:simple-view "25.5.2 Helper concepts [range.utility.helpers]")<V> && [slide-caches-nothing](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<const V>));
+`
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L14977)
+
+*Returns*: 
+
+- [(3.1)](#3.1)
+
+If V models [*slide-caches-first*](#concept:slide-caches-first "25.7.30.2 Class template slide_­view [range.slide.view]"),*iterator*<false>(ranges::begin(*base_*),
+ ranges::next(ranges::begin(*base_*), *n_* - 1, ranges::end(*base_*)), *n_*)
+
+- [(3.2)](#3.2)
+
+Otherwise, *iterator*<false>(ranges​::​begin(*base_*), *n_*)[.](#3.sentence-1)
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L14990)
+
+*Remarks*: In order to provide the amortized constant-time complexity
+required by the [range](range.range#concept:range "25.4.2 Ranges [range.range]") concept,
+this function caches the result within the slide_view for use on subsequent calls
+when V models [*slide-caches-first*](#concept:slide-caches-first "25.7.30.2 Class template slide_­view [range.slide.view]")[.](#4.sentence-1)
+
+[🔗](#lib:begin,slide_view_)
+
+`constexpr auto begin() const requires [slide-caches-nothing](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<const V>;
+`
+
+[5](#5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15005)
+
+*Returns*: *iterator*<true>(ranges​::​begin(*base_*), *n_*)[.](#5.sentence-1)
+
+[🔗](#lib:end,slide_view)
+
+`constexpr auto end()
+  requires (!([simple-view](range.utility.helpers#concept:simple-view "25.5.2 Helper concepts [range.utility.helpers]")<V> && [slide-caches-nothing](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<const V>));
+`
+
+[6](#6)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15017)
+
+*Returns*: 
+
+- [(6.1)](#6.1)
+
+If V models [*slide-caches-nothing*](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]"),*iterator*<false>(ranges::begin(*base_*) + range_difference_t<V>(size()), *n_*)
+
+- [(6.2)](#6.2)
+
+Otherwise, if V models [*slide-caches-last*](#concept:slide-caches-last "25.7.30.2 Class template slide_­view [range.slide.view]"),*iterator*<false>(ranges::prev(ranges::end(*base_*), *n_* - 1, ranges::begin(*base_*)), *n_*)
+
+- [(6.3)](#6.3)
+
+Otherwise, if V models [common_range](range.refinements#concept:common_range "25.4.6 Other range refinements [range.refinements]"),*iterator*<false>(ranges::end(*base_*), ranges::end(*base_*), *n_*)
+
+- [(6.4)](#6.4)
+
+Otherwise, *sentinel*(ranges​::​end(*base_*))[.](#6.sentence-1)
+
+[7](#7)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15039)
+
+*Remarks*: In order to provide the amortized constant-time complexity
+required by the [range](range.range#concept:range "25.4.2 Ranges [range.range]") concept,
+this function caches the result within the slide_view for use on subsequent calls
+when V models [*slide-caches-last*](#concept:slide-caches-last "25.7.30.2 Class template slide_­view [range.slide.view]")[.](#7.sentence-1)
+
+[🔗](#lib:end,slide_view_)
+
+`constexpr auto end() const requires [slide-caches-nothing](#concept:slide-caches-nothing "25.7.30.2 Class template slide_­view [range.slide.view]")<const V>;
+`
+
+[8](#8)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15054)
+
+*Returns*: begin() + range_difference_t<const V>(size())[.](#8.sentence-1)
+
+[🔗](#lib:size,slide_view)
+
+`constexpr auto size() requires [sized_range](range.sized#concept:sized_range "25.4.4 Sized ranges [range.sized]")<V>;
+constexpr auto size() const requires [sized_range](range.sized#concept:sized_range "25.4.4 Sized ranges [range.sized]")<const V>;
+`
+
+[9](#9)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15066)
+
+*Effects*: Equivalent to:auto sz = ranges::distance(*base_*) - *n_* + 1;if (sz < 0) sz = 0;return *to-unsigned-like*(sz);
+
+[🔗](#lib:reserve_hint,slide_view)
+
+`constexpr auto reserve_hint() requires [approximately_sized_range](range.approximately.sized#concept:approximately_sized_range "25.4.3 Approximately sized ranges [range.approximately.sized]")<V>;
+constexpr auto reserve_hint() const requires [approximately_sized_range](range.approximately.sized#concept:approximately_sized_range "25.4.3 Approximately sized ranges [range.approximately.sized]")<const V>;
+`
+
+[10](#10)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/ranges.tex#L15083)
+
+*Effects*: Equivalent to:auto sz = static_cast<range_difference_t<decltype((*base_*))>>(ranges::reserve_hint(*base_*)) -*n_* + 1;if (sz < 0) sz = 0;return *to-unsigned-like*(sz);