#include <iostream>
#include <ranges>
#include <sstream>
#include <string>

int main()
{
    auto input = std::istringstream{"0 1 2 3 4 5 6 7 8 9"};
    auto below_5 = std::ranges::istream_view<int>(input) 
        | std::views::take_while([](auto x) { return x < 5; });	

    for (auto e : below_5) std::cout << e << ' ';
}