[boost] [program options] why is ->multitoken() not default for vector arguments?

Subject: [boost] [program options] why is ->multitoken() not default for vector arguments?
From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2009-06-08 14:47:05

Hi,

I have code like

         bpo::options_description desc("Allowed options");
         desc.add_options()
         ("help", "produce help message")
         ("file", bpo::value<std::string>(), ".sug file with graph 
description")
         ("new_edge", bpo::value<std::vector<unsigned>>()->multitoken(),
          "two numbers denoting the new edge");

I had to add the ->multitoken to make a command like

./clique_tester.exe --new_edge 1 2 --file bug1.sug

                              ^^^^^^^^
work.

This seems wierd. Why would I want a vector of values, yet only parse 
one of the trailing argument?

Thanks

-Thorsten