(m4.info.gz) Conditionals
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5 Conditionals, loops, and recursion
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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. For that, 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.
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* Ifdef Testing if a macro is defined
* Ifelse If-else construct, or multibranch
* Loops Loops and recursion in m4
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