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[C++] A functor abuse, but a cool abuse :D

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Taken from http://www.boost.org/doc/html/program_options/tutorial.html, here's my “omigod why haven't I thought of this before” moment of the week:

// Declare the supported options.
po::options_description desc("Allowed options");
desc.add_options()
    ("help", "produce help message")
    ("compression", po::value(), "set compression level")
;

All I can say is: -_-)=b