std::ranges::slide_view<V>::begin

 

C++

Compiler support

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)

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
to (C++23)
Range primitives
range_size_trange_difference_trange_value_trange_reference_t	iterator_tconst_iterator_tsentinel_tconst_sentinel_t (C++23)(C++23)	range_const_reference_trange_rvalue_reference_trange_common_reference_t (C++23)	elements_of (C++23)
Dangling iterator handling
dangling	borrowed_iterator_t	borrowed_subrange_t
Range concepts
range borrowed_range sized_range constant_range (C++23)	common_range view viewable_range	input_range output_range forward_range	bidirectional_range random_access_range contiguous_range
Views
view_interface	subrange
Range factories
empty_viewviews::empty single_viewviews::single	iota_viewviews::iota repeat_viewviews::repeat (C++23)(C++23)	basic_istream_viewviews::istream
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	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 objects
Range adaptor closure objects
range_adaptor_closure (C++23)
Helper items
copyable-box movable-box (until C++23)(C++23)	simple-view non-propagating-cache

 

std::ranges::slide_view

Member functions

slide_view::slide_view (C++23)

slide_view::begin (C++23)

slide_view::end (C++23)

slide_view::size (C++23)

Deduction guides

Iterator

Member functions

slide_view::iterator::iterator (C++23)

slide_view::iterator::operator* (C++23)

slide_view::iterator::operator[] (C++23)

slide_view::iterator::operator++ slide_view::iterator::operator++(int) slide_view::iterator::operator-- slide_view::iterator::operator--(int) slide_view::iterator::operator+= slide_view::iterator::operator-= (C++23)(C++23)(C++23)(C++23)(C++23)(C++23)

Non-member functions

operator==(slide_view::iterator) operator<(slide_view::iterator) operator>(slide_view::iterator) operator<=(slide_view::iterator) operator>=(slide_view::iterator) operator<=>(slide_view::iterator) (C++23)(C++23)(C++23)(C++23)(C++23)(C++23)

operator+(slide_view::iterator) operator-(slide_view::iterator) (C++23)(C++23)

Sentinel

Member functions

slide_view::sentinel::sentinel (C++23)

Non-member functions

operator==(slide_view::iterator,slide_view::sentinel) (C++23)

operator-(slide_view::iterator,slide_view::sentinel) (C++23)

 

constexpr auto begin()     requires (!(__simple_view<V> && __slide_caches_nothing<const V>));	(1)	(since C++23)
constexpr auto begin() const     requires __slide_caches_nothing<const V>;	(2)	(since C++23)

Returns an iterator to the first element of the slide_view.

1) If V models __slide_caches_first, equivalent to:

return iterator<false>(
           ranges::begin(base_),
           ranges::next(ranges::begin(base_), n_ - 1, ranges::end(base_)),
           n_
       );

Otherwise, equivalent to: return iterator<false>(ranges::begin(base_), n_);.

If V models __slide_caches_first this function caches the result within the slide_view::cached_begin_ for use on subsequent calls. This is necessary to provide the amortized constant-time complexity required by the range.

2) Equivalent to: return iterator<true>(ranges::begin(base_), n_);.

Parameters

(none)

Return value

An iterator to the first element of slide_view, which points to the n_-sized subrange of the possibly const-qualified underlying view type – V for overload (1) or const V for overload (2).

Example

A link to test: Compiler Explorer

Run this code

#include <ranges>
#include <iostream>
#include <string_view>
using namespace std::literals;
 
int main()
{
    static constexpr auto source = {"∀x"sv, "∃y"sv, "ε"sv, "δ"sv};
    auto view {std::ranges::slide_view(source, 2)};
    const auto subrange {*(view.begin())};
    for (std::string_view const s: subrange)
        std::cout << s << ' ';
}

Output:

∀x ∃y

See also

end (C++23)	returns an iterator or a sentinel to the end (public member function)
operator== (C++23)	compares a sentinel with an iterator returned from slide_view::begin (function)