On Mon, 2002-10-21 at 22:32, David B. Held wrote: 
>  [...]
>  interleave the two sets over the same tree nodes.  It could be
>  possible to generalize map into an arbitrary-arity tuple ordering
>  container.  After all, why not a trimap?  I could imagine this
>  
It seems that there would be the problem of all elements of the tuple
having to be const so that modifications do not change the ordering. 

I imagine that the only other option would be to include a mechanism of
alerting the container of changes to a particular element, which would
certainly be clumsy. 


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