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From: Ted Dennison<dennison@telepath.com>
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Subject: Re: ada vs. cpp
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Date: Tue, 13 Nov 2001 16:05:41 GMT
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Date: 2001-11-13T16:05:41+00:00
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In article <3bf0e265.74480421@News.CIS.DFN.DE>, Dmitry A. Kazakov says...
>template <int From, int To> class String {...};
>
>Here the string bounds identify the type. Which has a nasty
>consequence that String<1,10> and String<1,80> are two different
>types.

It should be noted that this is a *theoretical* example Dmitry is presenting.
C++'s "string" class is *not* defined this way. It is rather a single
instantiation of another template, and thus all objects of this class *are* the
same type.

Another thing I noticed with C++ templates is that instantiations that use the
same parameters appear to actually *be* the same object, unlike how Ada generics
work. That actually would help alleviate this problem a bit more than if you had
the same problem in Ada.

---
T.E.D.    homepage   - http://www.telepath.com/dennison/Ted/TED.html

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