[Boost-users] [program_options] Limited multitoken

Hello, I'm working on a personal project. Everything works using my own options processing function, but I am having a hard time implementing one specific aspect of my option processing code using the Boost program_options library. My program has a flag (-j) which takes in two doubles as arguments. Currently, I can invoke my program like so: ./foo -j 1.0 2.0 3 where 3 is treated like a positional. Because the -j option must consume several tokens, it seemed natural that I should use multitoken, like so: vector<double> v; po::options_description desc("Allowed options"); desc.add_options() ("jingle,j", po::value(&v)->multitoken(), "Test thing"); But this causes positional arguments to get eaten up and added to v when -j is the last flag option. So, in my example, v would contain 1.0, 2.0, and 3.0. I suppose I am looking for some way to indicate that the -j flag consumes exactly two tokens. I've looked over the documentation on the Boost website, but I couldn't find anything about this. Any help would be greatly appreciated. Thanks, -Brad