wks000 at t-online.de
Sat Jan 11 21:49:42 CET 2003
Erik Max Francis <max at alcyone.com>:
>Steve Hunt wrote:
>> Well that's not really what qua means. It means "in the role of".
>And it's one of those fancy Latin words that's only used in very limited
>circumstances. The only uses I've seen are _sine qua non_ ("without
>which, not") and _X qua X_ (with X being the same word both before and
There is a qua clause in Simula 67, a kind of class cast, so to speak.
<ref expr> qua <class name>
first asserts that <ref expr> is indeed a valid reference of an
instance of <class name> or a subclass of <class name>, and then
returns an expression of type ref(name). In combination with inspect
it allowes late binding in an otherwise statically typed language.
Thank you for observing all safety precautions
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