[pointer container] Wishlist: Iterating through nullable vectors and compiler firewalls

Two quick queries.

Would it make sense to have the iterator increment and decrement operators and 
begin() member function of ptr_vector< nullable<> > skip missing records so 
that applications have no need to check?

What is stopping pointer container classes from being used with opaque types 
as a compilation firewall?

--
Andrew Hain
Oasys
http://www.oasys-software.com

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