Re^5: the '..' operator and decreasing values


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Re^5: the '..' operator and decreasing values

by lidden (Curate)

on Mar 05, 2005 at 02:13 UTC ( [id://436833]=note: print w/replies, xml )

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in reply to Re^4: the '..' operator and decreasing values
in thread the '..' operator and decreasing values

It seems perl586delta fooled lots of us. I did som testing and it turns out that reverse 0..100 will turn 0..100 to a list of 101 elements and traverse that list from the end.

for ( reverse 0 .. 100_000_000) {};
[download]

Wants to grab lots of memory and gets killed by my OS, without reverse it works nicely. Tried with perl5.8.6 and perl5.9.1.

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Re^6: the '..' operator and decreasing values by doom (Deacon) on Mar 06, 2005 at 00:28 UTC
And you guys are reporting this bug to perl5-porters, right?	[reply]
Re^7: the '..' operator and decreasing values by ysth (Canon) on Mar 06, 2005 at 23:38 UTC
There's no bug. As of 5.8.6 (or maybe 5.8.5, didn't check that) the reverse is indeed optimized away. However, the .. operator is still evaluated to produce the full list (at compile time). So there's a potential for optimizing that away also, but you can't actually call it a bug.	[reply]

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