[Rcpp-devel] Modules and default constructors

[Douglas Bates]

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.