Convert a string to an integer using the boost lexical_cast

#include <boost/lexical_cast.hpp>
#include <string>
int main()
{
    std::string str = "12345";
    int i;
    try
    {   
        i = boost::lexical_cast<int>(str);
    }
    catch( const boost::bad_lexical_cast & )
    {
        //unable to convert
    }
 
    return 0;
}

#include <boost/lexical_cast.hpp>
int main(int argc, char * argv[])
{
    using boost::lexical_cast;
    using boost::bad_lexical_cast;
 
    std::vector<int> args;
 
    while(*++argv)
    {
        try
        {
            args.push_back(lexical_cast<int>(*argv));
        }
        catch(bad_lexical_cast &)
        {
            args.push_back(0);
        }
    }
 
    return 0;
}