[QUANTITY] and [OBSERVATION] data models: mutability
mchill at dial.pipex.com
Wed May 5 04:44:41 PDT 2004
David Berry wrote:
> That's certainly a possibility. It would be particularly relevant I guess
> for multi-threaded access to the Quantity. But on the other side of the
> balance is the expense of object creation in most OO languages.
It applies not just to multi-threaded access, but any occasion where
more than one reference is held (I'm in a bit of a rush just now but can
do examples for next week if need be). The object creation overhead is
a red herring at this stage! It only really matters in tight, large
loops where Quantity is likely to be inappropriately heavyweight anyway.
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