[Boost-users] Re: unordered_map has no lower_bound?

From: Martin Wartens (martin.wartens_at_[hidden])
Date: 2005-04-05 08:17:53

Hi,
I can confirm that the cast-variants don't prevent the warning. "return !!
*prev_ptr;" and "return *prev_ptr? true: false;" both seem to work. 
Back to the main topic: I find it quite unsatisfiying that there is seems to be 
no way to avoid searching for the same position twice 
("get_bucket", "find_iterator"). I don't see where the hint-version of insert 
could be of any use, especially since the standard says "Implementations are 
permitted to ignore the hint". I would need a function like "insert_if" taking 
a predicate that decides whether to insert when an object with the same key 
already exists.

Martin