C++ Boost Converting from double to int

#include <iostream>
#include "boost/numeric/conversion/converter.hpp"

using namespace std;
using namespace boost;
using namespace boost::numeric;

int main()/*from   w w  w .ja  v a 2s  .co  m*/
{
    // Create the converter.
    typedef converter<int, double> Double2Int;

    // Define the variables for the example.
    double MyDouble = 2.1;
    int MyInt = Double2Int::convert(MyDouble);

    // Display the results.
    cout << "The double value is: " << MyDouble << endl;
    cout << "The int value is: " << MyInt << endl;

    // See what happens with a larger value.
    MyDouble = 3.8;
    MyInt = Double2Int::convert(MyDouble);
    cout << "The double value is: " << MyDouble << endl;
    cout << "The int value is: " << MyInt << endl;

    // We don't want truncation, so lets round.
    typedef conversion_traits<int, double> Traits;
    typedef converter<int, double, Traits, def_overflow_handler,
                      RoundEven<double> > Double2Rounded;
    MyInt = Double2Rounded::convert(MyDouble);
    cout << "The int value is: " << MyInt << endl;

    return 0;
}