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

int main()
{
    float f;
    try
    {
        f = boost::lexical_cast<float>(".");
        std::cout << "boost::lexical_cast<float>(\".\") returned " << f << std::endl;
    }
    catch (boost::bad_lexical_cast &e)
    {
        std::cout << "boost::lexical_cast<float>(\".\") threw bad_lexical_cast" << std::endl;
    }
    return 0;
}