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

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 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_ ) ; .

#include <iostream>
#include <ranges>
#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 << ' ';
    std::cout << '\n';
}

∀x ∃y