[range.take.while.view] (original) (raw)

25 Ranges library [ranges]

25.7 Range adaptors [range.adaptors]

25.7.11 Take while view [range.take.while]

25.7.11.2 Class template take_while_view [range.take.while.view]

namespace std::ranges { template<view V, class Pred> requires input_range<V> && is_object_v<Pred> && indirect_unary_predicate<const Pred, iterator_t<V>> class take_while_view : public view_interface<take_while_view<V, Pred>> { template<bool> class sentinel; V base_ = V(); movable-box<Pred> pred_; public: take_while_view() requires default_initializable<V> && default_initializable<Pred> = default;constexpr explicit take_while_view(V base, Pred pred);constexpr V base() const & requires copy_constructible<V> { return base_; } constexpr V base() && { return std::move(base_); } constexpr const Pred& pred() const;constexpr auto begin() requires (<V>) { return ranges::begin(base_); } constexpr auto begin() const requires range<const V> && indirect_unary_predicate<const Pred, iterator_t<const V>> { return ranges::begin(base_); } constexpr auto end() requires (<V>) { return sentinel<false>(ranges::end(base_), addressof(*pred_)); } constexpr auto end() const requires range<const V> && indirect_unary_predicate<const Pred, iterator_t<const V>> { return sentinel<true>(ranges::end(base_), addressof(*pred_)); } };template<class R, class Pred> take_while_view(R&&, Pred) -> take_while_view<views::all_t<R>, Pred>;}

constexpr explicit take_while_view(V base, Pred pred);

Effects: Initializes base_ with std​::​move(base) and_pred__ with std​::​move(pred).

constexpr const Pred& pred() const;

Effects: Equivalent to: return *pred_;