str node = cfg (Name::IRCServer);
    int i = 5;
    float f;

    list<str> args;
    CmdLineParser::Schema schema ({
        { 'a', "address", &node },
        { 'i', "integer", &i    },
        { 'p', "pi",      &f    },
    });

    CmdLineParser parser (argc, argv, schema);
    parser.parse (args);