[texhax] A macro programming question

[Arno Trautmann]

Paul Isambert wrote:
> A final # in the parameter text of a definition stands for a left brace.
> So \def\foo#1#{...} means that the first argument is delimited by a left
> brace, hence it's "abc" in the following call:
> \foo abc{...}

Ah … I see. Now I understand many things way better …
Thanks a lot for this!

cheers
Arno

> Note that this delimiter is not absorbed as delimiters normally are,
> i.e. TeX still reads a left brace once it has found the argument.
> As remarked by Philipp, the weakness of the solution here is that boxes
> can be opened by an implicit \bgroup instead of {, which is not possible
> anymore with \hboxR.
> Paul
> 
> Arno Trautmann a écrit :
>> Paul Isambert wrote:
>>  
>>> You can say:
>>>
>>> \def\hboxR#1#{%
>>>     
>>
>> I saw this kind of definition in a package and tried to understand what
>> it does (to change \textcolor a bit) – but I just didn’t get the meaning
>> of it. Could you explain shortly what the effect of #1# is? …
>>
>> cheers
>> Arno
>>
>>  
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