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

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C++
Ranges library
Range adaptors
std::ranges::slide_view
Member functions
slide_view::begin
(C++26)
Deduction guides
Iterator
Member functions
Non-member functions
Sentinel
Member functions
Non-member functions
constexpr auto begin ( )
requires ( ! ( /*simple-view*/ < V > && /*slide-caches-nothing*/ < const V > ) ) ;
(1) (since C++23)
constexpr auto begin ( ) const
requires /*slide-caches-nothing*/ < const V > ;
(2) (since C++23)

Returns an iterator to the first element of the slide_view .

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_ ) ; .

Contents

Parameters

(none)

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 ) .

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

See also

returns an iterator or a sentinel to the end
(public member function)
(C++23)
compares a sentinel with an iterator returned from slide_view::begin
(function)