25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.29 Chunk view [range.chunk]

25.7.29.2 Class template chunk_view for input ranges [range.chunk.view.input]

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namespace std::ranges { template<class I> constexpr I div-ceil(I num, I denom) { // exposition only I r = num / denom; if (num % denom) ++r; return r; } template<view V> requires input_range<V> class chunk_view : public view_interface<chunk_view<V>> { V base_; // exposition only range_difference_t<V> n_; // exposition only range_difference_t<V> remainder_ = 0; // exposition only non-propagating-cache<iterator_t<V>> current_; // exposition only // [range.chunk.outer.iter], class chunk_view​::​outer-iterator class outer-iterator; // exposition only // [range.chunk.inner.iter], class chunk_view​::​inner-iterator class inner-iterator; // exposition only public: constexpr explicit chunk_view(V base, range_difference_t<V> n); constexpr V base() const & requires copy_constructible<V> { return base_; } constexpr V base() && { return std::move(base_); } constexpr outer-iterator begin(); constexpr default_sentinel_t end() const noexcept; constexpr auto size() requires sized_range<V>; constexpr auto size() const requires sized_range<const V>; }; template<class R> chunk_view(R&&, range_difference_t<R>) -> chunk_view<views::all_t<R>>; }
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constexpr explicit chunk_view(V base, range_difference_t<V> n);
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Preconditions: n > 0 is true.
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Effects: Initializes base_ with std​::​move(base) and n_ with n.
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constexpr outer-iterator begin();
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Effects: Equivalent to: current_ = ranges::begin(base_); remainder_ = n_; return outer-iterator(*this);
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constexpr default_sentinel_t end() const noexcept;
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Returns: default_sentinel.
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constexpr auto size() requires sized_range<V>; constexpr auto size() const requires sized_range<const V>;
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Effects: Equivalent to: return to-unsigned-like(div-ceil(ranges::distance(base_), n_));