| defineOptions-package | Define and Parse Command Line Options |
| callbacks | Built-in callbacks for option definitions |
| defineOptions | Define and Parse Command Line Options |
| define_option | Function to define an option for argument parsing |
| define_option-method | Function to define an option for argument parsing |
| new_parser_def | Constructor of ParserDef class |
| opt_optional_input_disallowed | Built-in callbacks for option definitions |
| opt_optional_input_required | Built-in callbacks for option definitions |
| opt_required_input_required | Built-in callbacks for option definitions |
| ParserDef | ParserDef S4 class |
| ParserDef-class | ParserDef S4 class |
| parse_with_defs | Function to parse command line arguments with ParserDef S4 object |
| parse_with_defs-method | Function to parse command line arguments with ParserDef S4 object |
| summary.parsed_result | Summarize parsed_result S3 object |