I believe it is now recommended that a class to be exposed in a module
should expose a default constructor (i.e. a constructor called with no
arguments). Is such a constructor actually called or is it just there
to establish the necessary linkage? In a class where it would not
make sense to construct an object without arguments I was going to
have the default constructor throw an exception but that might not be
a good idea. I seem to recall the discussion between John and Romain
indicating that it must be called during the initialization of the
reference class in R.
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