Sean Robinson 3efd045ea9 Add ArgumentParser.is_used to discern user-supplied values from defaults ... .present returns std::nullopt if the optional argument is not given by the user -- as long as a .default_value is not defined. With a .default_value, .present cannot be used to determine if a value is user-provided or the default. .is_used fills that role and only returns true if the argument was passed by the user. Signed-off-by: Sean Robinson <sean.robinson@scottsdalecc.edu>		2021-04-07 14:09:10 -07:00
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argparse	Add ArgumentParser.is_used to discern user-supplied values from defaults	2021-04-07 14:09:10 -07:00