#include <iostream>
#include <string>

void foo(int & length,		// string's length placed here
	 ostream & out,		// illegal to copy
	 const string & s) {	// too expensive to copy
  length = s.size();
  out << "foo: The string's length is " << length << ".\n";
  return;
}

int main(int argc, char *argv[]) {
  cout << "This silly program prints the length of the first command-line argument.\n";
  if (argc == 1) {		// too few command-line arguments
    cerr << argv[0] << ": string\n";
    throw "too few command-line arguments";
  }

  int l;			// initially has garbage value
  foo(argv[1], l);
  cout << argv[1] << " has " << l << " characters.\n";

  return EXIT_SUCCESS;
}