% 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 19.3.5, p. III-89.
% Original source in file "tokens2.TEX", starting line 1185.
\wlog{L: "cref-3.tip" ["tokens2.TEX," l. 1185, p. III-89]}%
% This file DOES NOT belong to format "texip."
\InputD{pickfs.tip}
\InputD{namedef.tip}
\InputD{nlm.tip}
\catcode`\@ = 11
\def\Ref     #1{\@ref{0}{#1}}
\def\PageRef #1{\@ref{1}{#1}}
\def\@ref #1#2{%
    \if\NameDefinedConditional{@REF-#2}%
        \edef\@CrefTemp{\NameUse{@REF-#2}}%
        \ifcase #1\relax 
            \expandafter\PickFirstOfTwo\@CrefTemp   % #1 = 0
        \or
            \expandafter\PickSecondOfTwo\@CrefTemp  % #1 = 1
        \fi
    \else
        {\bf ??}% 
        \NewLineMessage{Label #2 undefined.}%
    \fi
}
\catcode`\@ = 12