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Article #2038

Why \new... is outer. Was: reserving registers from within macros

#2038
From: David Kastrup
Date: Thu, 03 Sep 1992 13:37
19 lines
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asnd@reg.triumf.ca (Donald Arseneau) writes:

>In article <repasky.715398745@sun.bdc.ubc.ca>, repasky@bdc.ubc.ca (Dick Repasky) writes...
>>I would like to write a macro that reserves registers and assigns them 
>>names using pararmeters passed to the macro. For example, a call such
>>as \doit{zork} would be expanded so that the result was \newinsert\bigzork.
>>I've made the following attempt:
>> 
>>    \def\doit#1{\expandafter\newinsert\csname big#1\endcsname}
>> 
>>and I receive the error that \newinsert is a forbidden command sequence in
>>a macro definition.  Does anyone have advice?

>The problem is that \newinsert etc are defined "\outer".  There are two 
>solutions:
The reason that the \new-commands are outer is that they are only needed
for global variables. If you do it locally (inside a new group) you can
use ANY numeric register (save those used by the output routine) and assign
any values to them, since they will be restored on end of the group.
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Message-ID: <dak.715527435@kaa>
Path: arc1-ca.pugleaf.net!sparky!uunet!dtix!darwin.sura.net!Sirius.dfn.de!Urmel.Informatik.RWTH-Aachen.DE!kaa!dak
References: <repasky.715398745@sun.bdc.ubc.ca> <2SEP199204130168@reg.triumf.ca>

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Path: arc1-ca.pugleaf.net!sparky!uunet!dtix!darwin.sura.net!Sirius.dfn.de!Urmel.Informatik.RWTH-Aachen.DE!kaa!dak
From: dak@kaa.informatik.rwth-aachen.de (David Kastrup)
Newsgroups: comp.text.tex
Subject: Why \new... is outer. Was: reserving registers from within macros
Keywords: \new..., register, reserve, macro, definition, forbidden control seq.
Message-ID: <dak.715527435@kaa>
Date: 3 Sep 92 13:37:15 GMT
References: <repasky.715398745@sun.bdc.ubc.ca> <2SEP199204130168@reg.triumf.ca>
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Organization: Rechnerbetrieb Informatik  /  RWTH Aachen
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