#include <string>
#include <sstream>
#include <iostream>
#include <boost/spirit/core.hpp>
#include <boost/spirit/actor.hpp>

int main(void)
{
   using namespace std;
   using namespace boost::spirit;

   double d;
   string s("0.6");
   parse(s.begin(), s.end(), real_p[assign_a(d)]);
   cout.setf(std::ios::fixed|std::ios::left);
   cout.precision(20);
   cout << "Parsing with Spirit gives: " << d << endl;

   stringstream stream(s);
   double std_result;
   stream >> std_result;
   std::cout << "Parsing with iostream gives: " << std_result << endl;
}