std::ranges::views::istream, std::ranges::basic_istream_view, std::ranges::istream_view, std::ranges::wistream_view

template< std::movable Val, class CharT,
class Traits = std::char_traits<CharT> >
requires std::default_initializable<Val> &&
/*stream-extractable*/<Val, CharT, Traits>
class basic_istream_view
: public ranges::view_interface<basic_istream_view<Val, CharT, Traits>>

Helper templates

template< class Val >
using istream_view = ranges::basic_istream_view<Val, char>;

template< class Val >
using wistream_view = ranges::basic_istream_view<Val, wchar_t>;

Customization point objects

namespace views {
template< class T >
constexpr /* unspecified */ istream = /* unspecified */;
}

Helper concepts

template< class Val, class CharT, class Traits >
concept /*stream-extractable*/ =
requires(std::basic_istream<CharT, Traits>& is, Val& t) {
is >> t;
};

#include <algorithm>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <ranges>
#include <sstream>
#include <string>
 
int main()
{
    auto words = std::istringstream{"today is yesterday’s tomorrow"};
    for (const auto& s : std::views::istream<std::string>(words))
        std::cout << std::quoted(s, '/') << ' ';
    std::cout << '\n';
 
    auto floats = std::istringstream{"1.1  2.2\t3.3\v4.4\f55\n66\r7.7  8.8"};
    std::ranges::copy
    (
        std::views::istream<float>(floats),
        std::ostream_iterator<float>{std::cout, ", "}
    );
    std::cout << '\n';
}