ArgParser::oe_optionalParameter(param_arg_handler_t h)
{
    OptionEntry oe;
    oe.parameter_needed = false;
    oe.param_arg_handler = h;
    return oe;
}
ArgParser::oe_optionalParameter(param_arg_handler_t h)
{
    OptionEntry oe;
    oe.parameter_needed = false;
    oe.param_arg_handler = h;
    return oe;
}