#include <iterator>
#include <type_traits>
int main()
{
typedef std::istream_iterator<double> I1;
static_assert((std::is_convertible<I1,
std::iterator<std::input_iterator_tag, double, std::ptrdiff_t,
const double*, const double&> >::value), "");
static_assert((std::is_same<I1::char_type, char>::value), "");
static_assert((std::is_same<I1::traits_type, std::char_traits<char> >::value), "");
static_assert((std::is_same<I1::istream_type, std::istream>::value), "");
typedef std::istream_iterator<unsigned, wchar_t> I2;
static_assert((std::is_convertible<I2,
std::iterator<std::input_iterator_tag, unsigned, std::ptrdiff_t,
const unsigned*, const unsigned&> >::value), "");
static_assert((std::is_same<I2::char_type, wchar_t>::value), "");
static_assert((std::is_same<I2::traits_type, std::char_traits<wchar_t> >::value), "");
static_assert((std::is_same<I2::istream_type, std::wistream>::value), "");
}