[Boost-users] Program options: Set function for an option?

Subject: [Boost-users] Program options: Set function for an option?
From: Ingo Maindorfer (ingo_at_[hidden])
Date: 2010-08-17 05:43:59

Hi!

Let's assume we have this: (stolen from tutorial):

// Declare the supported options.
po::options_description desc("Allowed options");
desc.add_options()
     ("compression", po::value<int>(), "set compression level")
;

po::variables_map vm;
po::store(po::parse_command_line(ac, av, desc), vm);
po::notify(vm);

...

if (vm.count("compression")) {
     cout << "Compression level was set to "
<< vm["compression"].as<int>() << ".\n";
} else {
     cout << "Compression level was not set.\n";
}

Is there a way to set a new int to "compression" programmatically like this:

vm["compression"].set( 42 ) ?

Best regards,

Ingo