[Boost-users] Function or Bind question

Subject: [Boost-users] Function or Bind question
From: John Dlugosz (JDlugosz_at_[hidden])
Date: 2010-08-13 12:49:09

The command-line-argument library has a callback function 'notifier' used like this:

        po::wvalue<std::wstring>()->notifier(&foo)

If I write 

        void foo (const std::wstring& s)
         {
         C::bar(s);
         }

it works fine.  wstring and void are the template arguments to the function object.
Now if I write notifier(&C::bar) instead, I get a huge spiel of compiler errors.  Yet, from the body of foo you can see that s can be implicitly converted to the type of bar's argument (const boost::filesystem::wpath&) and the return type is also void.

I thought that generalized functions objects pretty much worked that if you can write the call in normal code, it makes the correct wrapper to do that.  What am I missing?

--John





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