Deriving from Map and obtaining const view facilities was straight forward, but of course one remaining problem is getting at the uninherited stuff.

Map itself uses a couple of macros, but that would presumably require building in Eigen namespace, and some arcane template incantations.

The only thing I can think of right now is to edit the Eigen Map source code and add another plugin mechanism.

Am I missing something obvious?

Is the answer RTF source code