call logic
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- Subject: call logic
- From: "Brent Arias" <barias@...>
- Date: 2005年8月23日 13:36:10 -0700
In the manual here: http://www.lua.org/pil/9.3.html
The following wrapped coroutine is demonstrated:
for p in perm{"a", "b", "c"} do
printResult(p)
end
function perm (a)
local n = table.getn(a)
return coroutine.wrap(function () permgen(a, n) end)
end
What I don't understand, is what principle or rule of lua is preventing
perm{"a","b","c"} to get called over and over again. I mean, evidently
"perm" is only called once, and the coroutine is the only part that keeps on
executing after the initial call to "perm." I would have thought that
"perm" would get called over and over as well, causing this loop to never
end (or the coroutine.wrap to be executed over and over again).
What magic is at work here?
-Brent