From: dewar@cs.nyu.edu (Robert Dewar)
Subject: Re: Simpler question, create instance of unknown tag
Date: 1996/03/15
Date: 1996-03-15T00:00:00+00:00 [thread overview]
Message-ID: <dewar.826948716@schonberg> (raw)
In-Reply-To: DoBw6H.Lyv@plato.ds.boeing.com
Scott asked:
" Can one use an Ada.Tags.Tag value (call it a meta-type)
and dynamically use it to create a concrete object
where the new object'Tag = this_tag_value
The compilers definitely can do this (for the Input implementation)
but can us mortals do it?"
No, there is no way to do it, and I have found several times that this
is a minor irritation. For the most part, GNAT translates the stream
attributes into legitimate lower level Ada, but it can't do that for
Input (see GNAT sources for details on the very interesting "kludge"
needed to implement this feature).
It's hard to think of a nice syntax for adding this to the language?
next prev parent reply other threads:[~1996-03-15 0:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
1996-03-15 0:00 Simpler question, create instance of unknown tag Scott Moody
1996-03-15 0:00 ` Simpler question, create instance of unkno Scott Moody
1996-03-15 0:00 ` Robert Dewar [this message]
1996-03-18 0:00 ` Simpler question, create instance of unknown tag Tucker Taft
[not found] ` <4ikbhn$cl6@watnews1.watson.ibm.com>
[not found] ` <DoHFu8.E2A@world.std.com>
1996-03-19 0:00 ` Norman H. Cohen
1996-03-19 0:00 ` Robert A Duff
1996-03-26 0:00 ` AdaWorks
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