Re: [Boost-users] [ptr_container] ptr_map predicates

Bill Buklis wrote:

Nevermind. I see you did put the predicate in your message. Thanks. Somehow I missed it when reading it.

bool predicate( const std::pair& p ) { return p.first.size() > 3; }

This does work correctly. Thanks.

HTH

Out of curiosity, if nothing else, is there a corresponding typedef that would match this? std::map would use value_type. What would be the equivalent for the ptr_map/void-ptr-map? Of course, depending on the length and indirection, it may be better anyway to explicitly list it out as the std::pair.

The current docs are a bit weak in this matter. But ptr_map::value_type is T* ptr_vector<T>::value_type is T* The fact that you cannot use the normal iterator to access the key in an algorithm is of course bad when you need it, but I still feel that the design in general is OK given the domain. There is no nested typedef right now that would give you the value-type of the void-ptr-map used internally, though you are guaranteed that it is std::map. I could thus add another pair of typedefs for this case. How does void_ptr_map_reference void_ptr_map_const_reference sound? Is it worth the effort? -Thorsten