The IFDEF
macro tests for the logical true value of the argument in its
first parameter list. If `true', the second parameter list is evaluated, else,
the third parameter list is evaluated. All three parameter lists (the
variable, the true-list and the false-list) must be present; though the
true-list and/or the false-list may be empty parameter lists.
The variable in the first parameter list evaluates the macro to `true' when
the first argument is:
DEFINEMACRO
, section ??),
DEFINESYMBOL
, section ??),
NEWCOUNTER
, section ??).
For an example, see the description of DEFINESYMBOL
, section
??.
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Copyright (c) 1997, 1998, 1999 Karel Kubat and Jan Nieuwenhuizen.
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