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NNTP-Posting-Date: Sun, 24 Jul 2011 14:53:13 -0500
Date: Sun, 24 Jul 2011 12:53:07 -0700
From: Patricia Shanahan <pats@acm.org>
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Subject: Re: Arithmetic overflow checking
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On 7/24/2011 11:09 AM, markspace wrote:
> On 7/24/2011 10:54 AM, Patricia Shanahan wrote:
>> meanwhile complex would be forced to provide a meaningless conversion to
>> byte.
>
>
> It could just throw an error. Collections uses this technique to make
> unmodifiable Collection's. An unmodifiable List for example throws
> UnsupportedOperation if add() is invoked. 'Taint the prettiest but it
> works.
>
>

As well as not being particularly pretty, it changes what could be a
compile time error to an exception during execution.

Note that misuses of arithmetic operator overloading can use exactly the
same technique - extend Number and throw exceptions for the Number
methods.

I still don't see the advantage over a marker interface.

Patricia