std::ranges::adjacent_view<V,N>::begin
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std::ranges::adjacent_view
adjacent_view::begin
(C++26)
Member functions
Non-member functions
constexpr auto begin() requires (!__SimpleView<V>);
(1)
(since C++23)
constexpr auto begin() const requires ranges::range <const V>;
(2)
(since C++23)
Returns an iterator to the first element of the adjacent_view.
Let base_ be the underlying view.
1) Equivalent to return /*iterator*/<false>(ranges::begin (base_), ranges::end (base_));.
2) Equivalent to return /*iterator*/<true>(ranges::begin (base_), ranges::end (base_));.
Contents
[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() { constexpr static auto v = {'A', 'B', 'C', 'D', 'E'}; constexpr auto view = std::views::adjacent <3>(v); constexpr auto tuple = *view.begin(); static_assert ( std::is_same_v < decltype(tuple), const std::tuple <char const&, char const&, char const&> > ); static_assert ( std::get<0>(tuple) == 'A' && std::get<1>(tuple) == 'B' && std::get<2>(tuple) == 'C' ); }