% This macro source file is from the four volume series % "TeX in Practice" by Stephan von Bechtolsheim, published % 1993 by Springer-Verlag, New York. % Copyright 1993 Stephan von Bechtolsheim. % No warranty or liability is assumed. % This macro may be copied freely if no fees other than % media cost or shipping charges are charged and as long % as this copyright and the following source code itself % is not changed. Please see the series for further information. % % Version: 1.0 % Date: May 1, 1993 % % % This source code is documented in 25.1.21.1, p. III-345. % Original source in file "macros5.TEX", starting line 1595. \wlog{L: "ifx-def.tip" ["macros5.TEX," l. 1595, p. III-345]}% % This file DOES belong to format "texip." \catcode`\@ = 11 \newif\if@Def \def\XDefinedConditional #1{% TT\fi \ifx #1\@AlwaysUndefinedToken \@Deffalse \else \@Deftrue \fi \if@Def } \catcode`\@ = 12