Was machen \@nameuse und \@namedef?

Ich bin gerade in einer Doku auf den Befehl \@nameuse{foo} gestoßen. Macht der das gleiche wie \csname foo\endcsname oder gibt es da Unterschiede? Und was macht der Befehl \@namedef{foo}?

macros latex-kern befehle

gefragt 07 Jun '16, 10:52

esdd
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bearbeitet 07 Jun '16, 11:12

saputello
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\@nameuse ist im LaTeX-Kern definiert als:

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\def\@nameuse#1{\csname #1\endcsname}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Das heißt, dass \@nameuse{foo} prinzipiell das gleiche wie \csname foo\endcsname ist. Natürlich hat das Ganze Auswirkungen bei der Expansion, weil \@nameuse nun einmal bereits eine Expansionsstufe benötigt, um überhaupt zu \csname …\endcsname zu kommen. Es hat auch Auswirkungen auf die Anzahl der zu verarbeitenden Token. Aber Speicher und Verarbeitungszeit spielen heutzutage wirklich keine Rolle mehr.

\@namedef ist im LaTeX-Kern als

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\def\@namedef#1{\expandafter\def\csname #1\endcsname}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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definiert. Das ist nun in der Tat nur eine Abkürzung, weil

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\@namedef{foo}{bar}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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schneller geschrieben ist als

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\expandafter\def\csname foo\endcsname{bar}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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und sich auch leichter liest. Man kann damit sogar Befehle mit Argument definieren:

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\@namedef{foo}#1{bar: #1}%
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Was dann

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\expandafter\def\csname foo\endcsname#1{bar: #1}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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entspricht. Diese Anweisung dürfte vermutlich auch der Hauptgrund für die Existenz von \@nameuse sein.

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beantwortet 07 Jun '16, 11:10

saputello
11.1k●17●43●65
Akzeptiert-Rate: 51%

bearbeitet 07 Jun '16, 11:11

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befehle ×52
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gestellte Frage: 07 Jun '16, 10:52

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zuletzt geändert: 07 Jun '16, 11:12

Was machen \@nameuse und \@namedef?

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