tmp/tmpuyxg9169/{from.md → to.md}
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| 1 |
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#### Class template `common_view` <a id="range.common.view">[[range.common.view]]</a>
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``` cpp
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namespace std::ranges {
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template<view V>
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requires (!common_range<V> && copyable<iterator_t<V>>)
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class common_view : public view_interface<common_view<V>> {
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private:
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V base_ = V(); // exposition only
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public:
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common_view() = default;
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constexpr explicit common_view(V r);
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template<viewable_range R>
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requires (!common_range<R> && constructible_from<V, views::all_t<R>>)
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constexpr explicit common_view(R&& r);
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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() {
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if constexpr (random_access_range<V> && sized_range<V>)
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return ranges::begin(base_);
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else
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return common_iterator<iterator_t<V>, sentinel_t<V>>(ranges::begin(base_));
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}
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constexpr auto begin() const requires range<const V> {
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if constexpr (random_access_range<const V> && sized_range<const V>)
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return ranges::begin(base_);
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else
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return common_iterator<iterator_t<const V>, sentinel_t<const V>>(ranges::begin(base_));
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}
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constexpr auto end() {
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if constexpr (random_access_range<V> && sized_range<V>)
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return ranges::begin(base_) + ranges::size(base_);
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else
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return common_iterator<iterator_t<V>, sentinel_t<V>>(ranges::end(base_));
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}
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constexpr auto end() const requires range<const V> {
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if constexpr (random_access_range<const V> && sized_range<const V>)
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return ranges::begin(base_) + ranges::size(base_);
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else
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return common_iterator<iterator_t<const V>, sentinel_t<const V>>(ranges::end(base_));
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}
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constexpr auto size() requires sized_range<V> {
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return ranges::size(base_);
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}
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constexpr auto size() const requires sized_range<const V> {
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return ranges::size(base_);
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}
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};
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template<class R>
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common_view(R&&) -> common_view<views::all_t<R>>;
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}
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```
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``` cpp
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constexpr explicit common_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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template<viewable_range R>
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requires (!common_range<R> && constructible_from<V, views::all_t<R>>)
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constexpr explicit common_view(R&& r);
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```
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*Effects:* Initializes *base\_* with `views::all(std::forward<R>(r))`.
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