#include <streambuf>
#include <type_traits>
int main()
{
static_assert((std::is_same<std::streambuf::char_type, char>::value), "");
static_assert((std::is_same<std::streambuf::traits_type, std::char_traits<char> >::value), "");
static_assert((std::is_same<std::streambuf::int_type, std::char_traits<char>::int_type>::value), "");
static_assert((std::is_same<std::streambuf::pos_type, std::char_traits<char>::pos_type>::value), "");
static_assert((std::is_same<std::streambuf::off_type, std::char_traits<char>::off_type>::value), "");
static_assert((std::is_same<std::wstreambuf::char_type, wchar_t>::value), "");
static_assert((std::is_same<std::wstreambuf::traits_type, std::char_traits<wchar_t> >::value), "");
static_assert((std::is_same<std::wstreambuf::int_type, std::char_traits<wchar_t>::int_type>::value), "");
static_assert((std::is_same<std::wstreambuf::pos_type, std::char_traits<wchar_t>::pos_type>::value), "");
static_assert((std::is_same<std::wstreambuf::off_type, std::char_traits<wchar_t>::off_type>::value), "");
}