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I need to be able to have boost::program_options parse an array of doubles that are passed on a command line. For positive doubles, this is no problem, of course (use multitoken with std::vector<double> in add_options), but for negative ones, I know that these are ambiguous arguments. Here is a demonstration of what I would like to take in: mycommand --extent -1.0 -2.0 -3.0 1.0 2.0 3.0 --some-other-argument somevalue extent is to be backed by a Bounds class with at least one constructor that takes in six individual T arguments (in this case -- double ). template <typename T> class Bounds { public: typedef T value_type; typedef typename std::vector< Range<T> >::size_type size_type; typedef typename std::vector< Range<T> > Ranges; Bounds( T minx, T miny, T minz, T maxx, T maxy, T maxz) { // fill Ranges vector } private: Ranges ranges; }; What else must I supply to support using add_options take in the Bounds class? I'd like to do something similar to this. Possible? namespace po = boost::program_options; po::options_description options("options"); options.add_options() ("extent,e", po::value< Bounds< double > >(), "Extent to clip points to") po::variables_map vm; po::store(po::command_line_parser(argc, argv). options(options).positional(p).run(), vm); po::notify(vm); if (vm.count("extent")) { Bounds<double> bounds = vm["extent"].as< Bounds<double> >(); // do other stuff }

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