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Message-ID:  <859ec5630811110628r6e00e26avb1974d36679a25b6@mail.gmail.com>
Date:         Tue, 11 Nov 2008 15:28:05 +0100
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From: =?ISO-8859-1?Q?Morten_H=F8gholm?= <morten.hoegholm@GMAIL.COM>
Subject: Re: \tlp_reverse:N?
To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
In-Reply-To:  <18713.15630.241986.200940@morse.mittelbach-online.de>
Precedence: list
Status: R

On Tue, Nov 11, 2008 at 9:06 AM, Frank Mittelbach wrote:

> depends on how efficient you want to make it ...

Or how much you want it expanded.

> \def_new:Npn \tlp_reverse:N #1 {
>  \tlp_set:Nx #1
>    {\tlist_reverse:o{#1}}
> }
>
> \def_new:Npn \tlist_reverse:o { \exp_args:No \tlist_reverse:n }

\def_new:Npn \tlp_reverse:N #1 {
   \tlp_set:Nf #1
   {\tlist_reverse:o{#1\exp_stop_f:}}
}

This reverses the list, leaving \exp_stop_f: in front, which in turn
is removed by the f expansion which comes to a halt.
-- 
Morten