#include <boost/lexical_cast.hpp> 
#include <string> 
#include <iostream> 

int main() 
{ 
  try 
  { 
    int i = boost::lexical_cast<int>("abc"); 
    std::cout << i << std::endl; 
  } 
  catch (boost::bad_lexical_cast &e) 
  { 
    std::cerr << e.what() << std::endl; 
  } 
}