tmp/tmpkzea2va1/{from.md → to.md}
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| 1 |
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#### Class template `chunk_view` for input ranges <a id="range.chunk.view.input">[[range.chunk.view.input]]</a>
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``` cpp
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namespace std::ranges {
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template<class I>
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constexpr I div-ceil(I num, I denom) { // exposition only
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I r = num / denom;
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if (num % denom)
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++r;
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return r;
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}
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template<view V>
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requires input_range<V>
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class chunk_view : public view_interface<chunk_view<V>> {
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V base_; // exposition only
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range_difference_t<V> n_; // exposition only
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range_difference_t<V> remainder_ = 0; // exposition only
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non-propagating-cache<iterator_t<V>> current_; // exposition only
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// [range.chunk.outer.iter], class chunk_view::outer-iterator
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class outer-iterator; // exposition only
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// [range.chunk.inner.iter], class chunk_view::inner-iterator
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class inner-iterator; // exposition only
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public:
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constexpr explicit chunk_view(V base, range_difference_t<V> n);
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constexpr V base() const & requires copy_constructible<V> { return base_; }
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constexpr V base() && { return std::move(base_); }
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constexpr outer-iterator begin();
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constexpr default_sentinel_t end() const noexcept;
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constexpr auto size() requires sized_range<V>;
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constexpr auto size() const requires sized_range<const V>;
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};
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template<class R>
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chunk_view(R&&, range_difference_t<R>) -> chunk_view<views::all_t<R>>;
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}
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```
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``` cpp
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constexpr explicit chunk_view(V base, range_difference_t<V> n);
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```
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*Preconditions:* `n > 0` is `true`.
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*Effects:* Initializes *base\_* with `std::move(base)` and *n\_* with
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`n`.
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``` cpp
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constexpr outer-iterator begin();
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```
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*Effects:* Equivalent to:
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``` cpp
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current_ = ranges::begin(base_);
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remainder_ = n_;
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return outer-iterator(*this);
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```
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``` cpp
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constexpr default_sentinel_t end() const noexcept;
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```
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*Returns:* `default_sentinel`.
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``` cpp
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constexpr auto size() requires sized_range<V>;
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constexpr auto size() const requires sized_range<const V>;
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```
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*Effects:* Equivalent to:
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``` cpp
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return to-unsigned-like(div-ceil(ranges::distance(base_), n_));
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```
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