std::ranges::slide_view<V>::begin
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std::ranges::slide_view
slide_view::begin
(C++26)
Member functions
Non-member functions
Member functions
Non-member functions
constexpr auto begin()
requires (!(/*simple-view*/<V> && /*slide-caches-nothing*/<const V>));
(1)
(since C++23)
requires (!(/*simple-view*/<V> && /*slide-caches-nothing*/<const V>));
constexpr auto begin() const
requires /*slide-caches-nothing*/<const V>;
(2)
(since C++23)
requires /*slide-caches-nothing*/<const V>;
Returns an iterator to the first element of the slide_view.
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_ );.Contents
[edit] Parameters
(none)
[edit] Return value
An iterator to the first element of slide_view, which points to the n_ -sized subrange of the underlying view type: V for overload (1) or const V for overload (2).
[edit] Example
Run this code
#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'; }
Output:
∀x ∃y