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?
Thanks!
