Re^2: fall through switch/case in perl

Actually, this is just a standard switch statement,-- not Duff's device.

On the clarity argument, it's very much in the eye of the beholder whether your if cascade (or the and cascade) is clearer than the computed-goto version?

For completeness, the computed goto version works out an average of over 60% faster than either of the cascade versions, which is rather more than a few dozen clock cycles.

Examine what is said, not who speaks.

"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon

Comment on Re^2: fall through switch/case in perl

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Re^3: fall through switch/case in perl by Aristotle (Chancellor) on Sep 07, 2004 at 03:21 UTC
That's because it doesn't test and retest conditions like the cascades do, it just computes a goto target. Makeshifts last the longest.	[reply]
Re^4: fall through switch/case in perl by BrowserUk (Patriarch) on Sep 07, 2004 at 03:25 UTC
I know that! And that's why it's a better conversion of the c switch statement. Examine what is said, not who speaks. "Efficiency is intelligent laziness." -David Dunham "Think for yourself!" - Abigail "Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon	[reply] [d/l]