Consequently, to_input_view never models range concepts that are stronger than input_range. In particular, it does not model all of these:
Additionally, to_input_view does not model common_range. However, it does model borrowed_range, constant_range, and sized_range when the underlying view V models respective concepts.
V base_ (private) the underlying view
to_input_view
sized_range.
sized_range or forward_range
std::ranges::view_interface<D>) [edit] returns a constant iterator to the beginning of the range
std::ranges::view_interface<D>) [edit] returns a sentinel for the constant iterator of the range
std::ranges::view_interface<D>) [edit] returns whether the derived view is not empty, provided only if ranges::empty is applicable to it
std::ranges::view_interface<D>) [edit] gets the address of derived view's data, provided only if its iterator type satisfies contiguous_iterator
std::ranges::view_interface<D>) [edit] returns the first element in the derived view, provided if it satisfies forward_range
std::ranges::view_interface<D>) [edit] returns the last element in the derived view, provided only if it satisfies bidirectional_range and common_range
std::ranges::view_interface<D>) [edit] returns the nth element in the derived view, provided only if it satisfies random_access_range
std::ranges::view_interface<D>) [edit] std::ranges::to_input_view::to_input_view (1) (since C++26)
constexpr explicit to_input_view( V base );
(2) (since C++26)1) Value-initializes base_ via its default member initializer (= V()).
2) Initializes base_ with std::move(base).
constexpr V base() &&;
(2) (since C++26)1) Copy-constructs the result from the underlying view. Equivalent to return base_;.
2) Move-constructs the result from the underlying view. Equivalent to return std::move(base_);.
std::ranges::to_input_view::beginconstexpr auto begin() requires (!__simple_view<V>);
(1) (since C++26) (2) (since C++26) 1)Equivalent to
return /*iterator*/<false>(ranges::begin(base_)); 2)Equivalent to
return /*iterator*/<true>(ranges::begin(base_)); std::ranges::to_input_view::endconstexpr auto end() requires (!__simple_view<V>);
(1) (since C++26) (2) (since C++26) std::ranges::to_input_view::size [edit] Deduction guides template< class R >This specialization of std::ranges::enable_borrowed_range makes to_input_view satisfy borrowed_range when the underlying view satisfies it.
to_input_view can be useful to avoid the overhead necessary to provide support for the operations needed for greater iterator strength.
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