[Boost-users] problems with boost::spirit

14 Mar 2009

      Hi all, 

I wanna get boost::spirit to tell me which position in my string is 
liable that parsing fails. Here's a fully compiling demonstration: 

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

using namespace std; 
using namespace boost::spirit; 

int main() 
{ 
  string s = "#x"; 
  rule<> r = chlit<>('#') >> chlit<>('X') >> *space_p; 

  parse_info<> p = parse(s.c_str(),r); 
  if(p.full) 
    cout << "File is OK:\n"; 
  else 
    cout << "Error at pos " << p.length << ".\n"; 

  return 0; 
}
#-------------------------------------------------------------------- 

With this I get: 

Error at pos 4294967295. 

But if "string s = "#Xx" I get: 

Error at pos 2. 

This is what I want. But why do I get 4294967295 which is 2^32-1. 

Thanks for any comments, 
Goran.