#include <boost/program_options.hpp>
using namespace boost::program_options;

#include <string>
#include <vector>
#include <iostream>
using namespace std;

std::vector<option> parseDashless(std::vector<std::string>& cmdline)
{
    std::string s = cmdline[0];
    cmdline.erase(cmdline.begin());
    std::string::size_type n = s.find('=');
    if (n != s.npos)
    {
        return std::vector<option>(
            1, option(s.substr(0, n), 
                      std::vector<string>(1, s.substr(n+1))));        
    }
    else
    {
        return std::vector<option>(1, option(s, std::vector<string>()));
    }
}

int main(int ac, char* av[])
{
   options_description desc;
    desc.add_options()
        ("test", value<int>(), "test option")
    ;

    variables_map vm;
    store(
        command_line_parser(ac, av).options(desc)
        .extra_style_parser(parseDashless).run(),
        vm);
    if (vm.count("test"))
    cout << "test = " << vm["test"].as<int>() << "\n";  
    return 0;
}