> Thank you very much for your answer, but what I really wanted was to> expose 
> to Python just the first element of the pair and not the whole> pair, so that 
> the fact that it is a pair in c++ would be transparent> to python. For 
> instance, if I had struct A{std::pair<int,bool> a;};,
> I just wanted to expose a.first, as a simple int...

Do you want

  a_obj = A()
  a_obj.a.first
 
to give you the int in Python or

  a_obj.a
 
?
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