[Boost-users] [boost bimap]- question on use of optional sorting predicate for set_of declarations

Subject: [Boost-users] [boost bimap]- question on use of optional sorting predicate for set_of declarations
From: Curtis Himel (chimel_at_[hidden])
Date: 2009-11-27 13:41:53

I have a question with sorting of sets in the bimap framework.  I have a bimap declared thus:
 
 
//Boost Bimap requires this predicate struct setup
struct AreDecalIDsInCorrectRenderOrderStruct
{
   bool operator() (const short nDecalID1, const short nDecalID2) const
   {
       //Do comparison
   }
};
 
typedef boost::bimap<boost::bimaps::unordered_multiset_of<int>, boost::bimaps::set_of<short, AreDecalIDsInCorrectRenderOrderStruct>> intMultisetShortSetBimap;
 
 intMultisetShortSetBimap m_mStructureIDToLinkedDecalID;

 
 
 
The problem is this isn't working as I expected.  I'm expecting that when I insert elements using:
 
m_mStructureIDToLinkedDecalID.insert(intMultisetShortSetBimap ::value_type(nStructureID, nDecalID));

and then later retrieve them using:
 
pair<intMultisetShortSetBimap ::left_const_iterator, intMultisetShortSetBimap ::left_const_iterator> equalRange =
  m_mStructureIDToLinkedDecalID.left.equal_range(nStructureID);
 
that the retrieved elements with equal range would be sorted according to the predicate I used.  But they aren't.  Instead their order is dependent on the order they were inserted.  I've verified that my predicate is being called on insertions.
Am I misunderstanding the purpose of passing a sorting predicate to a set_of declaration?  If so, what does the sorting actually do and is there a way to get boost::bimap to do what I want?
Thanks for any help.
 
-Curtis
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