[C++-sig] copy_const_reference or return_internal_reference?

[Ralf W. Grosse-Kunstleve]

I have an object composed of 12 double. A const& to this object is returned by
a member function of another class. From the viewpoint of using the returned
object in Python I do not care if I get a copy or a reference to the returned
object. In Boost.Python Version 2 I have the choice of using
copy_const_reference or return_internal_reference. Are there considerations
that would lead me to prefer one over the other, such as size of generated code
or memory overhead?

Thanks,
        Ralf


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