Defined in header <ranges> | ||
|---|---|---|
template< ranges::view V >
requires ranges::input_range<V>
class as_rvalue_view :
public ranges::view_interface<as_rvalue_view<V>>
| (1) | (since C++23) |
namespace views {
inline constexpr /* unspecified */ as_rvalue = /* unspecified */;
}
| (2) | (since C++23) |
| Call signature | ||
template< ranges::viewable_range R >
requires /* see below */
constexpr ranges::view auto as_rvalue( R&& r );
| (since C++23) |
view whose elements are rvalues.e be a subexpression and let T be decltype((e)). Then the expression views::as_rvalue(e) is expression-equivalent to: views::all(e), if it is a well-formed expression and std::same_as<ranges::range_rvalue_reference_t<T>, ranges::range_reference_t<T>> is true; as_rvalue_view{e} otherwise.Typical implementations of as_rvalue_view only hold one non-static data member:
V (shown here as base_, the name is exposition only). |
(C++23) | constructs an as_rvalue_view (public member function) |
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(C++23) | returns the underlying view V (public member function) |
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(C++23) | returns the beginning iterator of the as_rvalue_view (public member function) |
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(C++23) | returns the end iterator of the as_rvalue_view (public member function) |
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(C++23) | returns the size of the view if it is bounded (public member function) |
Inherited from |
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(C++20) | returns whether the derived view is empty. Provided if it satisfies sized_range or forward_range. (public member function of std::ranges::view_interface<D>) |
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(C++23) | returns a constant iterator to the beginning of the range. (public member function of std::ranges::view_interface<D>) |
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(C++23) | returns a sentinel for the constant iterator of the range. (public member function of std::ranges::view_interface<D>) |
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(C++20) | returns whether the derived view is not empty. Provided if ranges::empty is applicable to it. (public member function of std::ranges::view_interface<D>) |
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(C++20) | returns the first element in the derived view. Provided if it satisfies forward_range. (public member function of std::ranges::view_interface<D>) |
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(C++20) | returns the last element in the derived view. Provided if it satisfies bidirectional_range and common_range. (public member function of std::ranges::view_interface<D>) |
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(C++20) | returns the nth element in the derived view. Provided if it satisfies random_access_range. (public member function of std::ranges::view_interface<D>) |
as_rvalue_view() requires std::default_initializable<V> = default; | (1) | (since C++23) |
constexpr explicit as_rvalue_view( V base ); | (2) | (since C++23) |
base_ via its default member initializer (= V()).base_ with std::move(base).| base | - | a view |
constexpr V base() const& requires std::copy_constructible<V>; | (1) | (since C++23) |
constexpr V base() &&; | (2) | (since C++23) |
Returns the underlying view.
return base_;.return std::move(base_);. constexpr auto begin() requires (!__simple_view<V>); | (1) | (since C++23) |
constexpr auto begin() const requires ranges::range<const V>; | (2) | (since C++23) |
std::move_iterator(ranges::begin(base_)). constexpr auto end() requires (!__simple_view<V>); | (1) | (since C++23) |
constexpr auto end() const requires ranges::range<const V>; | (2) | (since C++23) |
std::move_iterator(ranges::end(base_)) if V models common_range, otherwise std::move_sentinel(ranges::end(base_)).std::move_iterator(ranges::end(base_)) if const V models common_range, otherwise std::move_sentinel(ranges::end(base_)). constexpr auto size() requires ranges::sized_range<V>; | (1) | (since C++23) |
constexpr auto size() const requires ranges::sized_range<const V>; | (2) | (since C++23) |
Returns the size of the view if the view is bounded.
return ranges::size(base_);
template< class R > as_rvalue_view( R&& ) -> as_rvalue_view<views::all_t<R>>; | (since C++23) |
template< class T >
inline constexpr bool enable_borrowed_range<std::ranges::as_rvalue_view<T>> =
std::ranges::enable_borrowed_range<T>;
| (since C++23) |
This specialization of std::ranges::enable_borrowed_range makes as_rvalue_view satisfy borrowed_range when the underlying view satisfies it.
| Feature-test macro | Value | Std | Comment |
|---|---|---|---|
__cpp_lib_ranges_as_rvalue | 202207L | (C++23) |
std::ranges::as_rvalue_view |
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(C++11) | iterator adaptor which dereferences to an rvalue reference (class template) |
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(C++20) | sentinel adaptor for use with std::move_iterator (class template) |
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(C++23) | converts a view into a constant_range (class template) (range adaptor object) |
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