[C++-sig] V2 equivalent of make_ref

[Ralf W. Grosse-Kunstleve]

What is the equivalent of make_ref in V2?
Here is what I would like to do:

boost::python::module("any")
  .add("__version__", boost::python::make_ref("1.2.3"));

I tried to find the documentation for boost::python::ref but the link to
reference_hpp.html is broken.

Thanks,
        Ralf


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