[C++-sig] Arbitrary argument lists, Python style?

[Conan Brink]

Forgive me if I'm just being dense, but in hours of searching multiple
archives, I have not been able to find a way to implement the following
Python code in C++ via BPL (simplified somewhat for purposes of this
discussion):

 

class BackCaller:

  def SetCallback(self, action, *args):

    self.cb = (action, args)

 

  def CallItBack(self):

    if self.cb:

      (action, args) = self.cb

      return action(*args)

 

The thing that's causing me to pull foot-long hairs from my head is that
little *args

 

Is such a thing possible, or do I need to do one of the following:

1)                            Tell my Python users that they have to
explicitly wrap their args in a tuple?

2)                            Write a Python wrapper that does the
translation back and forth between the variable arg list and a tuple
that can be passed explicitly to and from my BPL-wrapped class?

 

(and no, I'm not just doing this for fun - I've got some existing Python
code that is being redone in C++ because it needs to live closer to the
wire)

 

-Conan




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