memory pool algorithms

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Hi Guys,

I was just wondering if anyone knew of an algorithm/method which 
facilitated simple memory pool allocation of a single type but with 
constant time allocation/deallocation/item retrieval by index and also 
provided a 'nice' way to iterate through the used elements?

We have a class which gives us everything but the last two together. We 
can add a linked list of used elements (giving us the iteration) but then 
you can't retrieve by index in constant time. Or we can retrieve by index 
in constant time but then you can't iterate cleanly because there will be 
holes in the memory pool.

Cheers, Paul.
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