24 Ranges library [ranges]

24.7 Range adaptors [range.adaptors]

24.7.5 All view [range.all]

24.7.5.3 Class template owning_­view [range.owning.view]

owning_­view is a move-only view of the elements of some other range.
namespace std::ranges { template<range R> requires movable<R> && (!is-initializer-list<R>) // see [range.refinements] class owning_view : public view_interface<owning_view<R>> { private: R r_ = R(); // exposition only public: owning_view() requires default_­initializable<R> = default; constexpr owning_view(R&& t); owning_view(owning_view&&) = default; owning_view& operator=(owning_view&&) = default; constexpr R& base() & noexcept { return r_; } constexpr const R& base() const& noexcept { return r_; } constexpr R&& base() && noexcept { return std::move(r_); } constexpr const R&& base() const&& noexcept { return std::move(r_); } constexpr iterator_t<R> begin() { return ranges::begin(r_); } constexpr sentinel_t<R> end() { return ranges::end(r_); } constexpr auto begin() const requires range<const R> { return ranges::begin(r_); } constexpr auto end() const requires range<const R> { return ranges::end(r_); } constexpr bool empty() requires requires { ranges::empty(r_); } { return ranges::empty(r_); } constexpr bool empty() const requires requires { ranges::empty(r_); } { return ranges::empty(r_); } constexpr auto size() requires sized_­range<R> { return ranges::size(r_); } constexpr auto size() const requires sized_­range<const R> { return ranges::size(r_); } constexpr auto data() requires contiguous_­range<R> { return ranges::data(r_); } constexpr auto data() const requires contiguous_­range<const R> { return ranges::data(r_); } }; }
constexpr owning_view(R&& t);
Effects: Initializes r_­ with std​::​move(t).