Re: [Boost-users] Help with (possibly MPL) pattern for a viewer that may contain a copy of statically allocated data

Steven Watanabe writes:

AMDG

Jesse Perla wrote:

...

I am wondering what the best pattern/approach for a data structure that may contain either a reference or a copy of some data used in a constructor.[...]

If you don't need to decide at runtime whether to store a copy or a reference, then you can avoid the reference when you have a copy using static polymorphism:

[beatiful solution snipped] When the OP's post got to my mailbox, I rapidly put myself to work in a solution with the hope that Steven was asleep or somehow away from his computer, but he's done it again --beating eveybody to providing an answer, and with style too! It's not fair! Joaquín M López Muñoz Telefónica, Investigación y Desarrollo