tmp/tmpxnkzpixu/{from.md → to.md}
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| 1 |
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#### Class template `adjacent_view` <a id="range.adjacent.view">[[range.adjacent.view]]</a>
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``` cpp
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namespace std::ranges {
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template<forward_range V, size_t N>
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requires view<V> && (N > 0)
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class adjacent_view : public view_interface<adjacent_view<V, N>> {
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V base_ = V(); // exposition only
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// [range.adjacent.iterator], class template adjacent_view::iterator
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template<bool> class iterator; // exposition only
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// [range.adjacent.sentinel], class template adjacent_view::sentinel
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template<bool> class sentinel; // exposition only
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struct as-sentinel{}; // exposition only
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public:
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adjacent_view() requires default_initializable<V> = default;
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constexpr explicit adjacent_view(V base);
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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 auto begin() requires (!simple-view<V>) {
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return iterator<false>(ranges::begin(base_), ranges::end(base_));
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}
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constexpr auto begin() const requires range<const V> {
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return iterator<true>(ranges::begin(base_), ranges::end(base_));
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}
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constexpr auto end() requires (!simple-view<V>) {
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if constexpr (common_range<V>) {
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return iterator<false>(as-sentinel{}, ranges::begin(base_), ranges::end(base_));
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} else {
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return sentinel<false>(ranges::end(base_));
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}
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}
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constexpr auto end() const requires range<const V> {
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if constexpr (common_range<const V>) {
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return iterator<true>(as-sentinel{}, ranges::begin(base_), ranges::end(base_));
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} else {
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return sentinel<true>(ranges::end(base_));
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}
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}
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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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}
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```
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``` cpp
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constexpr explicit adjacent_view(V base);
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```
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*Effects:* Initializes *base\_* with `std::move(base)`.
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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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using ST = decltype(ranges::size(base_));
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using CT = common_type_t<ST, size_t>;
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auto sz = static_cast<CT>(ranges::size(base_));
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sz -= std::min<CT>(sz, N - 1);
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return static_cast<ST>(sz);
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```
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