std::ranges::adjacent_view<V,N>::begin
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< cpp | ranges | adjacent view
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' ); }
[edit] See also
returns an iterator or a sentinel to the end (public member function) | |
(C++20) |
returns an iterator to the beginning of a range (customization point object) |