(m4.info) Conditionals

 
 Conditionals, loops and recursion
 *********************************
 
    Macros, expanding to plain text, perhaps with arguments, are not
 quite enough.  We would like to have macros expand to different things,
 based on decisions taken at run-time.  E.g., we need some kind of
 conditionals.  Also, we would like to have some kind of loop construct,
 so we could do something a number of times, or while some condition is
 true.
(m4.info) Conditionals

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