boost::program_options: How to specify a command without “--” or “-”
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23-06-2021 - |
سؤال
I'm using boost::program_options to implement a command-line utility with this syntax:
myutil command [--in file_name] [---out file_name]
where 'command' is mandatory, and is one of the following:
read | write | find | version | help
the thing is that 'command' should not require --
or -
and I have not found how to do that with boost::program_options.
المحلول
The command line options which have no name are called positional options:
po::positional_options_description p;
p.add("command", -1);
po::variables_map vm;
po::store(po::command_line_parser(ac, av).
options(desc).positional(p).run(), vm);
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