[lltx] why user-defined callbacks?

Arno Trautmann Arno.Trautmann at gmx.de
Thu Jul 21 15:24:14 CEST 2011

Hi, me again,

I forgot to ask that question in the last mail: What is the advantage of 
a user-defined callback (still talking about luatexbase-mcb) over a 
user-defined function? Maybe I still don't get the idea of a callback, 
but in that case I don't see the difference. Is there any and if so, which?


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