diff options
Diffstat (limited to 'info/examples/tex-in-practice/newdef.tip')
-rw-r--r-- | info/examples/tex-in-practice/newdef.tip | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/info/examples/tex-in-practice/newdef.tip b/info/examples/tex-in-practice/newdef.tip new file mode 100644 index 0000000000..28f8cb3081 --- /dev/null +++ b/info/examples/tex-in-practice/newdef.tip @@ -0,0 +1,43 @@ +% 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 21.5.7, p. III-175. +% Original source in file "macros1.TEX", starting line 1292. +\wlog{L: "newdef.tip" ["macros1.TEX," l. 1292, p. III-175]}% +% This file DOES belong to format "texip." +\catcode`\@ = 11 +\def\NewDef #1{% + \ifx #1\@UndefinedToken + \else + \errhelp = {\string\NewDef: + The name of the macro to be defined which you + provided is already in use. Use \show to find out + what the name is used for. The macro definition + will nevertheless be executed.}% + \errmessage{\string\NewDef: "\string#1" already defined.}% + \fi + \def #1% +} +\def\ReDef #1{% + \ifx #1\@UndefinedToken + \errhelp = {\string\ReDef: + The name of the macro to be redefined which you + provided has never been used before. The macro definition + will nevertheless be executed. }% + \errmessage{\string\ReDef: "\string#1" never defined + before.}% + \fi + \def #1% +} +\catcode`\@ = 12 |