ArgParser::oe_positional(param_arg_handler_t h)
{
    OptionEntry oe;
    oe.param_arg_handler = h;
    return oe;
}
ArgParser::oe_positional(param_arg_handler_t h)
{
    OptionEntry oe;
    oe.param_arg_handler = h;
    return oe;
}