[boost] Spirit rules

From: Kai-Mikael Jää-Aro (kai_at_[hidden])
Date: 2003-07-16 11:23:14

I obviously have not understood how spirit rules are supposed to work.  The 
simple program below fails to compile (spewing out 42 lines of error messages).
If I replace the application of 'Id' with int_p directly it works OK.
What am I supposed to do to get the intended effect?

#include <iostream>
#include <boost/spirit.hpp>

using namespace std;
using namespace boost::spirit;

int main(int *argc, char *argv[])
{

   int ID;

   rule<> Id = int_p;

   if (parse(argv[1],
            Id [assign(ID)],
            space_p).full)
     {
       cout << "Value = " << ID << endl;
     }
   else
     {
       cout << "Failed\n";
     }
}