How to specialize templates for l-value and non-l-value arguments?

[Roman D. Boiko]

On Thursday, 14 June 2012 at 15:27:24 UTC, Roman D. Boiko wrote:
> I have a struct that holds an immutable pointer to some data. I 
> would like to initialize it with a pointer to anything that is 
> passed inside, so if it is a not an l-value, I would need to 
> copy it to the heap first. How can I determine if it is an 
> l-value? How to implement copying correctly?
Comments like "this is bullshit, you don't want to do that" are 
welcome :) I'm not sure what would be the correct thing to do in 
this case.