#include <iostream>
#include <string>
#include <sstream>
#include <cassert>
int main()
{
std::istringstream stream( "-1" );
std::cout << "flags: " << (unsigned long)stream.flags() << std::endl;
unsigned short n = 0;
stream >> n;
cout << "sz us" << (size_t)(sizeof n) << " :: " << n;
// assert( stream.fail());
//std::cout << "can't convert -1 to unsigned short" << std::endl;
return 0;
}