From: Victor Porton <porton@narod.ru>
Subject: Re: Tell whether a primitive subprogram was overridden
Date: Tue, 19 Aug 2014 02:57:15 +0300
Date: 2014-08-19T02:57:15+03:00 [thread overview]
Message-ID: <lsu3sr$kcv$1@speranza.aioe.org> (raw)
In-Reply-To: 0b8124b3-5d31-4c2b-a27e-64795625c7f0@googlegroups.com
Adam Beneschan wrote:
> On Monday, August 18, 2014 4:41:24 PM UTC-7, Victor Porton wrote:
>> Is it possible to determine whether for a given object of type T'Class a
>> primitive subprogram F was overridden (not the same as for type T)?
>>
>> I would like this check for efficiency reasons, not to pass it to a
>> callback if the default "null" operation was not overridden.
>
> No, Ada doesn't provide a mechanism for this. I don't know of a language
> that does, although in some languages you might be able to use
> "reflection" to squeeze the information out, but with some difficulty.
>
> The best solution that I can think of is to add a function to T:
>
> function F_Does_Something_Useful (Obj : T) return boolean;
>
> This would be False for T, but for any derived type where you override F,
> you'd also override this function to make it return True.
No, I won't add this obscure function F_Does_Something_Useful only to
increase the speed for a tiny bit.
--
Victor Porton - http://portonvictor.org
next prev parent reply other threads:[~2014-08-18 23:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-18 23:41 Tell whether a primitive subprogram was overridden Victor Porton
2014-08-18 23:52 ` Adam Beneschan
2014-08-18 23:57 ` Victor Porton [this message]
2014-08-19 9:50 ` Simon Wright
2014-08-19 1:29 ` Shark8
2014-08-19 7:31 ` Dmitry A. Kazakov
2014-08-19 13:45 ` Victor Porton
2014-08-19 13:57 ` Dmitry A. Kazakov
2014-08-19 15:54 ` Victor Porton
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