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From: rogeeff (rogeeff_at_[hidden])
Date: 2002-02-07 20:48:41


I recently meet the need for joining iterator, i.e. iterator that
traverse through "concatenation" of two collections; first elements
of first collection then the second. Inducing example looked like

Let say we have a storage of objects that need to provide an access
to them by integer ID. IDs could not constitute continuous set. But
we can insure that tere is a continuous subset of most frequently
accessed IDs. So storage implemented as combination of vector and map.
Now I need an iterator for this storage that will traverse through
all the objects. Here where joining iterator come to use.

Implementation and test module are located here:

If boosters will find it intersting and reusable I could also provide
example and docs.

There is one small flaw with current implementation: it could lie
sometimes about resulting iterator category. Does anybody know
elegant way to deduce most restrictive category of two provided?


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