On Fri, 25 Jun 2010, Vyatcheslav Yatskovsky wrote:
Hi,
Now I check for an undefined constant like this:
\ifx \Homeworks \undefined \else Home works -- {\Homeworks} \fi
The useful part is in "else" clause. How to swap this check so that "else"
is not needed?
From syst-gen.mkii
%D \macros
%D {doifundefined,doifdefined,
%D doifundefinedelse,doifdefinedelse,
%D doifalldefinedelse}
%D
%D The standard way of testing if a macro is defined is
%D comparing its meaning with another undefined one, usually
%D \type{\undefined}. To garantee correct working of the next
%D set of macros, \type{\undefined} may never be defined!
%D
%D \starttyping
%D \doifundefined {string} {...}
%D \doifdefined {string} {...}
%D \doifundefinedelse {string} {then ...} {else ...}
%D \doifdefinedelse {string} {then ...} {else ...}
%D \doifalldefinedelse {commalist} {then ...} {else ...}
%D \stoptyping
%D
So
\doifdefined{Homeworks}{...}
Aditya
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
