std::ranges::subrange<I,S,K>::prev

 

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Ranges library

Range access
begin cbegin end cend	rbegin crbegin rend crend	size ssize data cdata	empty
Range primitives
iterator_tsentinel_t	range_size_trange_difference_t	range_reference_trange_rvalue_reference_t	range_value_t
Dangling iterator handling
dangling	borrowed_iterator_t	borrowed_subrange_t
Range concepts
range borrowed_range    sized_range	common_range view viewable_range	input_range output_range forward_range	bidirectional_range random_access_range contiguous_range
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view_interface	subrange
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empty_viewviews::empty	single_viewviews::single	iota_viewviews::iota	basic_istream_viewviews::istream
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views::all_tviews::all ref_view owning_view common_viewviews::common reverse_viewviews::reverse views::counted zip_viewviews::zip (C++23)(C++23)	take_viewviews::take take_while_viewviews::take_while drop_viewviews::drop drop_while_viewviews::drop_while zip_transform_viewviews::zip_transform (C++23)(C++23)	elements_viewviews::elements keys_viewviews::keys values_viewviews::values transform_viewviews::transform adjacent_viewviews::adjacent (C++23)(C++23)	filter_viewviews::filter join_viewviews::join split_viewviews::split lazy_split_viewviews::lazy_split adjacent_transform_viewviews::adjacent_transform (C++23)(C++23)
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copyable-box	simple-view

 

std::ranges::subrange

Member functions

subrange::subrange (C++20)

subrange::operator PairLike (C++20)

Observers

subrange::begin (C++20)

subrange::end (C++20)

subrange::empty (C++20)

subrange::size (C++20)

Iterator operations

subrange::advance (C++20)

subrange::next (C++20)

subrange::prev (C++20)

Deduction guides

Non-member functions

get (C++20)

Helper types

subrange_kind (C++20)

tuple_size (C++20)

tuple_element (C++20)

 

[[nodiscard]] constexpr subrange prev( std::iter_difference_t<I> n = 1 ) const     requires std::bidirectional_iterator<I>;		(since C++20)

Obtains a subrange whose iterator is decremented by n times or incremented by min(-n, size()) times respect to that of *this, when n >= 0 or n < 0 respectively.

Equivalent to auto tmp = *this; tmp.advance(-n); return tmp;. The behavior is undefined if the iterator is decremented after being a non-decrementable value.

Parameters

n

-

number of minimal decrements of the iterator

Return value

A subrange whose iterator is decremented by n times or incremented by min(-n, size()) times respect to that of *this, when n >= 0 or n < 0 respectively.

Complexity

Generally n decrements or min(-n, size()) increments on the iterator, when n >= 0 or n < 0 respectively.

Constant if I models random_access_iterator, and either n >= 0 or std::sized_sentinel_for<S, I> is modeled.

See also

next (C++20)	obtains a copy of the subrange with its iterator advanced by a given distance (public member function)
advance (C++20)	advances the iterator by given distance (public member function)
prev (C++11)	decrement an iterator (function template)
ranges::prev (C++20)	decrement an iterator by a given distance or to a bound (niebloid)