tmp/tmpxvtp3kq9/{from.md → to.md}
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| 1 |
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#### Class template `split_view` <a id="range.split.view">[[range.split.view]]</a>
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``` cpp
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namespace std::ranges {
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template<auto> struct require-constant; // exposition only
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template<class R>
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concept tiny-range = // exposition only
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sized_range<R> &&
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requires { typename require-constant<remove_reference_t<R>::size()>; } &&
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(remove_reference_t<R>::size() <= 1);
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template<input_range V, forward_range Pattern>
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requires view<V> && view<Pattern> &&
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indirectly_comparable<iterator_t<V>, iterator_t<Pattern>, ranges::equal_to> &&
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(forward_range<V> || tiny-range<Pattern>)
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class split_view : public view_interface<split_view<V, Pattern>> {
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private:
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V base_ = V(); // exposition only
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Pattern pattern_ = Pattern(); // exposition only
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iterator_t<V> current_ = iterator_t<V>(); // exposition only, present only if !forward_range<V>
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// [range.split.outer], class template split_view::outer-iterator
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template<bool> struct outer-iterator; // exposition only
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// [range.split.inner], class template split_view::inner-iterator
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template<bool> struct inner-iterator; // exposition only
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public:
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split_view() = default;
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constexpr split_view(V base, Pattern pattern);
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template<input_range R>
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requires constructible_from<V, views::all_t<R>> &&
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constructible_from<Pattern, single_view<range_value_t<R>>>
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constexpr split_view(R&& r, range_value_t<R> e);
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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 (forward_range<V>)
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return outer-iterator<simple-view<V>>{*this, ranges::begin(base_)};
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else {
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current_ = ranges::begin(base_);
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return outer-iterator<false>{*this};
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}
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}
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constexpr auto begin() const requires forward_range<V> && forward_range<const V> {
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return outer-iterator<true>{*this, ranges::begin(base_)};
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}
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constexpr auto end() requires forward_range<V> && common_range<V> {
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return outer-iterator<simple-view<V>>{*this, ranges::end(base_)};
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}
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constexpr auto end() const {
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if constexpr (forward_range<V> && forward_range<const V> && common_range<const V>)
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return outer-iterator<true>{*this, ranges::end(base_)};
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else
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return default_sentinel;
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}
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};
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template<class R, class P>
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split_view(R&&, P&&) -> split_view<views::all_t<R>, views::all_t<P>>;
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template<input_range R>
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split_view(R&&, range_value_t<R>)
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-> split_view<views::all_t<R>, single_view<range_value_t<R>>>;
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}
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```
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``` cpp
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constexpr split_view(V base, Pattern pattern);
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```
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*Effects:* Initializes *base\_* with `std::move(base)`, and *pattern\_*
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with `std::move(pattern)`.
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``` cpp
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template<input_range R>
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requires constructible_from<V, views::all_t<R>> &&
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constructible_from<Pattern, single_view<range_value_t<R>>>
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constexpr split_view(R&& r, range_value_t<R> e);
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```
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*Effects:* Initializes *base\_* with `views::all(std::forward<R>(r))`,
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| 87 |
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and *pattern\_* with `single_view{std::move(e)}`.
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