On 07-11-2012 19:02, Victor Snyder wrote:

ptr_map lets me map simple types to pointers-to-T, preserving polymorphic behavior of the mapped-to objects, and clearly stating that the ptr_map solely owns the pointed-to objects.

I'd like to map pointers-to-U to pointers-to-T and have the map solely own the key objects as well as the mapped-to objects. ptr_map doesn't do this. I could map shared_ptrs-to-U to pointers-to-T, but then I lose the clear ownership semantics.

Does anyone know of an easy workaround to get the behavior and semantics that I want, or is this more properly a feature request?

I don't know of an easy way. You're welcome to suggest it, but its not a trivial update to ptr_map. Perhaps something like typedef ptr_array Key: typedef ptr_map Map; would work? Let us know if this is an option. -Thorsten