std::ranges::chunk_by_view<V,Pred>::find_next, std::ranges::chunk_by_view<V,Pred>::find_prev

 

C++

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Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Execution support library (C++26)

Technical specifications

Symbols index

External libraries

 

Ranges library

Range access begin cbegin   end cend rbegin crbegin   rend crend size ssize   data cdata empty

Range conversions std::from_range_t std::from_range (C++23)(C++23)     to (C++23)

Dangling iterator handling dangling borrowed_iterator_t borrowed_subrange_t

Range primitives
range_size_trange_difference_trange_value_t elements_of (C++23)	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (C++23)(C++23)	range_reference_trange_const_reference_trange_rvalue_reference_trange_common_reference_t (C++23)

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	constant_range (C++23)

Views
view_interface	subrange

Range factories
empty_viewviews::empty	single_viewviews::single	basic_istream_viewviews::istream	iota_viewviews::iota	repeat_viewviews::repeat (C++23)(C++23)

Range adaptors
views::all_tviews::all ref_view owning_view as_rvalue_viewviews::as_rvalue (C++23)(C++23)   filter_viewviews::filter transform_viewviews::transform take_viewviews::take take_while_viewviews::take_while concat_viewviews::concat (C++26)(C++26)	drop_viewviews::drop drop_while_viewviews::drop_while join_viewviews::join join_with_viewviews::join_with (C++23)(C++23)   lazy_split_viewviews::lazy_split split_viewviews::split views::counted common_viewviews::common	reverse_viewviews::reverse as_const_viewviews::as_const (C++23)(C++23) elements_viewviews::elements keys_viewviews::keys values_viewviews::values enumerate_viewviews::enumerate (C++23)(C++23) zip_viewviews::zip (C++23)(C++23) zip_transform_viewviews::zip_transform (C++23)(C++23)	adjacent_viewviews::adjacent (C++23)(C++23) views::pairwise (C++23) adjacent_transform_viewviews::adjacent_transform (C++23)(C++23) views::pairwise_transform (C++23) chunk_viewviews::chunk (C++23)(C++23) slide_viewviews::slide (C++23)(C++23) chunk_by_viewviews::chunk_by (C++23)(C++23) stride_viewviews::stride (C++23)(C++23) cartesian_product_viewviews::cartesian_product (C++23)(C++23)

Range generators std::generator (C++23)

Range adaptor closure objects range_adaptor_closure (C++23)

Range adaptor objects

Helper items
copyable-box movable-box (until C++23)  (C++23)	simple-view non-propagating-cache

 

std::ranges::chunk_by_view

Member functions

chunk_by_view::chunk_by_view

chunk_by_view::base

chunk_by_view::pred

chunk_by_view::begin

chunk_by_view::end

chunk_by_view::find_next

chunk_by_view::find_prev

Deduction guides

Iterator

chunk_by_view::iterator::iterator

chunk_by_view::iterator::operator*

chunk_by_view::iterator::operator++ chunk_by_view::iterator::operator++(int) chunk_by_view::iterator::operator-- chunk_by_view::iterator::operator--(int)

operator==(chunk_by_view::iterator)

 

std::ranges::chunk_by_view::next

constexpr ranges::iterator_t<V>     /*find-next*/( ranges::iterator_t<V> current );		(since C++23) (exposition only*)

Finds the next chunk.

Let base_ and pred_ be appropriate underlying data-members of chunk_by_view.

Equivalent to

return ranges::next
(
    ranges::adjacent_find
    (
        current, ranges::end(base_), std::not_fn(std::ref(*pred_))
    ),
    1, ranges::end(base_)
);

The behavior is undefined if pred_.has_value() is false before the call to this function.

Used in the following non-static member functions:

• ranges::chunk_by_view::iterator::operator++

Parameters

current

-

the iterator to current element in adapted view

Return value

An iterator to the next chunk, as described above.

std::ranges::chunk_by_view::prev

constexpr ranges::iterator_t<V>     /*find-prev*/( ranges::iterator_t<V> current )         requires ranges::bidirectional_range<V>;		(since C++23) (exposition only*)

Finds the previous chunk.

Let base_ and pred_ be appropriate underlying data-members of chunk_by_view.

Returns an iterator i in the range [ranges::begin(base_), current) such that:

• ranges::adjacent_find(i, current, std::not_fn(std::ref(*pred_))) is equal to current, and
• if i is not equal to ranges::begin(base_), then bool(std::invoke(*pred_, *ranges::prev(i), *i)) is false.

The behavior is undefined if before the call to this function current == ranges::begin(base_) or pred_.has_value() != true.

Used in the following non-static member functions:

• ranges::chunk_by_view::iterator::operator--

Parameters

current

-

the iterator to current element in adapted view

Return value

An iterator to the previous chunk, as described above.