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std::ranges::lazy_split_view<V,Pattern>:: end

From cppreference.net
C++
Ranges library
Range adaptors
std::ranges::lazy_split_view
constexpr auto end ( ) requires ranges:: forward_range < V > && ranges:: common_range < V > ;
(1) (since C++20)
constexpr auto end ( ) const ;
(2) (since C++20)

Returns an iterator or sometimes a sentinel representing the end of the view . Let base_ be the underlying view.

1) Returns an iterator. Equivalent to: return /*outer_iterator*/ < /*simple_view*/ < V >> { * this, ranges:: end ( base_ ) } ; .
2) Returns an outer_iterator or a std::default_sentinel .

Equivalent to: 

if constexpr (ranges::forward_range<V> && ranges::forward_range<const V> &&
              ranges::common_range<const V>)
    return /*outer_iterator*/<true>{*this, ranges::end(base_)};
else
    return std::default_sentinel;

Return value

An outer_iterator or a std::default_sentinel representing the end of the view .

Example

Run this code 
#include <iostream>
#include <ranges>
#include <string_view>
int main()
{
    constexpr std::string_view keywords{"false float for friend"};
    std::ranges::lazy_split_view kw{keywords, ' '};
    const auto count = std::ranges::distance(kw.begin(), kw.end());
    std::cout << "Words count: " << count << '\n';
}

Output: 

Words count: 4

See also

returns an iterator to the beginning
(public member function)
returns an iterator or a sentinel to the end
(public member function of std::ranges::split_view<V,Pattern> )
(C++20)
returns an iterator to the beginning of a range
(customization point object)
(C++20)
returns a sentinel indicating the end of a range
(customization point object)