What is wrong with this code for reading binary files? It compiles OK, but will not print out the file as planned, in fact, it prints nothing at all.

#include <iostream>
#include <fstream>

int main(int argc, const char *argv[])
{
   if (argc < 2) {
      ::std::cerr << "usage: " << argv[0] << " <filename>\n";
      return 1;
   }
   ::std::basic_ifstream<unsigned char> in(argv[1], ::std::ios::binary);
   unsigned char uc;
   while (in.get(uc)) {
      printf("%02X ", uc);
   }
   // TODO: error handling, in case the file could not be opened or read
   return 0;
}