std::ranges::adjacent_view<V,N>::begin

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Ranges library

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begin
cbegin
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(C++23)

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elements_viewviews::elements
keys_viewviews::keys
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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)
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cartesian_product_viewviews::cartesian_product (C++23)(C++23)

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copyable-box
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(until C++23) (C++23)

simple-view
non-propagating-cache

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std::ranges::adjacent_view

Member functions
adjacent_view::adjacent_view
adjacent_view::begin
adjacent_view::end
adjacent_view::size
adjacent_view::reserve_hint (C++26)
Iterator
Member functions
adjacent_view::iterator::iterator
adjacent_view::iterator::operator*
adjacent_view::iterator::operator[]
adjacent_view::iterator::operator++ adjacent_view::iterator::operator++(int) adjacent_view::iterator::operator-- adjacent_view::iterator::operator--(int) adjacent_view::iterator::operator+= adjacent_view::iterator::operator-=
Non-member functions
operator==(adjacent_view::iterator) operator<(adjacent_view::iterator) operator>(adjacent_view::iterator) operator<=(adjacent_view::iterator) operator>=(adjacent_view::iterator) operator<=>(adjacent_view::iterator)
operator+(adjacent_view::iterator) operator-(adjacent_view::iterator)
iter_move(adjacent_view::iterator)
iter_swap(adjacent_view::iterator)
Sentinel
Member functions
adjacent_view::sentinel::sentinel
Non-member functions
operator==(adjacent_view::iterator,adjacent_view::sentinel)
operator-(adjacent_view::iterator,adjacent_view::sentinel)

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constexprauto begin() requires(!__SimpleView<V>);	(1)	(since C++23)
constexprauto begin()const requiresranges::range<const V>;	(2)	(since C++23)

Returns aniterator to the first element of theadjacent_view.

Letbase_ be the underlying view.

1) Equivalent toreturn/*iterator*/<false>(ranges::begin(base_),ranges::end(base_));.

2) Equivalent toreturn/*iterator*/<true>(ranges::begin(base_),ranges::end(base_));.

[edit]Parameters

(none)

[edit]Return value

Iterator to the first element.

[edit]Example

Run this code

#include <ranges>#include <tuple>#include <type_traits> int main(){constexprstaticauto v={'A','B','C','D','E'}; constexprauto view= std::views::adjacent<3>(v); constexprauto tuple=*view.begin();     static_assert(std::is_same_v<            decltype(tuple),conststd::tuple<charconst&,charconst&,charconst&>>);     static_assert(        std::get<0>(tuple)=='A'&&        std::get<1>(tuple)=='B'&&        std::get<2>(tuple)=='C');}

[edit]See also

end	returns an iterator or a sentinel to the end (public member function)[edit]
ranges::begin (C++20)	returns an iterator to the beginning of a range (customization point object)[edit]

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std::ranges::adjacent_view<V,N>::begin

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