Look-ahead question

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#156

From: John R. Ehrman (408-463-3543 T/5...
Date: Tue, 03 Oct 2006 18:46

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The D' attribute reference will return 0 if the symbol is not
defined, or 1 if it is; both tests are made at the position in
the program where the attribute reference occurs. D' is meant
to do just what you need (and was invented for that purpose).

John Ehrman
    (------------------ Referenced Note Follows --------------------)
Date:         Tue, 3 Oct 2006 20:37:53 +0200
From: Abe Kornelis <abe@bixoft.nl>

Does anybody know of a way to tell in advance whether or not a
specific field will be defined before its mapping macro is invoked?

I have not been able to find a solution.

After a field has been defined (DS or DC) I can of course use the
D' attribute. But to my knowledge, this will not work *before* the
field in question has been defined.

I need to take action before the field is actually defined...

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From: "John R. Ehrman (408-463-3543 T/543-)" <ehrman@vnet.ibm.com>
Newsgroups: bit.listserv.asm370
Subject: Look-ahead question
Date: Tue, 3 Oct 2006 11:46:19 -0700
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