I see in the documentation the class positional_options_description is used to list names for positional options. But nowhere in the documentation does it say how to pass this to the parser! Given the code based on the documentation samples, po::store(po::parse_command_line(argc,argv,opt),vm); po::notify(vm); and po::positional_options_description pd; pd.add("output-file", 2).add("input-file", -1); where do I tell parse_command_line about pd? = TradeStation Group, Inc. is a publicly-traded holding company (NASDAQ GS: TRAD) of three operating subsidiaries, TradeStation Securities, Inc. (Member NYSE, FINRA, SIPC and NFA), TradeStation Technologies, Inc., a trading software and subscription company, and TradeStation Europe Limited, a United Kingdom, FSA-authorized introducing brokerage firm. None of these companies provides trading or investment advice, recommendations or endorsements of any kind. The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer.