very basic question incr

I've been programming for about 45 years.  I've been programming about 2 days
with M4.

I want to increment or double a "variable" every time I call a macro.
A paper "Exploiting the m4 Macro Language" by Kenneth J. Turner available on
the web suggests:


define(‘Count’,‘incr(Count)’)

then invoking it with
Count

produces m4: stack overflow

using:

define(‘Count’,incr(`Count'))
Count produces m4: non-numeric to builtin`incr'

using:
define(`count',0)
define(`count',`incr(count)')
count
also produces stack overflow

I would appreciate being told the simple idiom I am trying to write.  Once I
understand incr() I assume I could use eval(x *2) to produce doubling


Thanks,

/s/ Jim WIlliams

I'm using:
m4 (GNU M4) 1.4.16
Packaged by Cygwin (1.4.16-1)


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