[C++-sig] Finally!

[David Abrahams]

Extract support is implemented. Please see
libs/python/test/extract.[cpp/py] for example usage.

-Dave

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                  David Abrahams
      C++ Booster (http://www.boost.org)               O__  ==
      Pythonista (http://www.python.org)              c/ /'_ ==
  resume: http://users.rcn.com/abrahams/resume.html  (*) \(*) ==
          email: david.abrahams at rcn.com
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