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std::ranges..._view::begin(3) C++ Standard Libarystd::ranges..._view::begin(3) NAME std::ranges::adjacent_view::begin - std::ranges::adjacent_view::begin Synopsis 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_));. Parameters (none) Return value Iterator to the first element. 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' ); } See also end returns an iterator or a sentinel to the end (C++23) (public member function) ranges::begin returns an iterator to the beginning of a range (C++20) (customization point object) http://cppreference.com 2024.06.10 std::ranges..._view::begin(3)
NAME | Synopsis | Parameters | Return value | Example | See also
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