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

Andrew Hain skrev:
> 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?

Well, it is always a design trade-off. If we did that, then people who 
need to know the index of the null value is in trouble.

I do think it would make sense to add some utility iterator/range:

boost::ptr_vector<T> vec;
...
BOOST_FOREACH( T& e, boost::filter_nulls(vec) )

or something. I'm open to naming ideas 

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

Can you be more specific? I have some trouble knowing the precise problem.

Thanks

-Thorsten
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