as_pair flag from_aux_file named named named OptionsDescription positional positional positional PositionalOptionsDescription ProgramOptions ValueSemantics ~ProgramOptions

positional() void positional ( const char *  name, const ValueSemantics *  value, const char *  description  ) Add a positional option. Parameters name The option name value The option value semantics description The option description A positional option is also a named option (thus the name parameter). For example, a positional option input can be used either as: Program <value> or Program --input <value> Positional options should be added in the expected order of the command line.