std::ranges::views::repeat, std::ranges::repeat_view

template< std::move_constructible W,
std::semiregular Bound = std::unreachable_sentinel_t >
requires (std::is_object_v<W> && std::same_as<W, std::remove_cv_t<W>> &&
(/*integer-like-with-usable-difference-type*/<Bound> ||
std::same_as<Bound, std::unreachable_sentinel_t>))
class repeat_view : public ranges::view_interface<repeat_view<W, Bound>>

namespace views {
inline constexpr /* unspecified */ repeat = /* unspecified */;
}

Call signature

template< class W >
requires /* see below */
constexpr /* see below */ repeat( W&& value );

template< class W, class Bound >
requires /* see below */
constexpr /* see below */ repeat( W&& value, Bound&& bound );

Helper concepts

concept /*integer-like-with-usable-difference-type*/ =
/*is-signed-integer-like*/<T> ||
(/*is-integer-like*/ <T> && std::weakly_incrementable<T>)

#include <iostream>
#include <ranges>
#include <string_view>
using namespace std::literals;
 
int main()
{
    // bounded overload
    for (auto s : std::views::repeat("C++"sv, 3))
        std::cout << s << ' ';
    std::cout << '\n';
 
    // unbounded overload
    for (auto s : std::views::repeat("I know that you know that"sv)
                | std::views::take(3))
        std::cout << s << ' ';
    std::cout << "...\n";
}