Re: [boost] [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