Re^7: how to read multiple line from a file

> This has nothing to do with theory.

Nonsense! Sorry!

Taking a short look into the Panther book convinces me that your understanding of AVs is rather oversimplifiedš!

There are mechanisms to optimize the effects of shifts and pushs!

Anyway others are more qualified to talk about perlguts.

Cheers Rolf

( addicted to the Perl Programming Language)

š) this is not C !

Comment on Re^7: how to read multiple line from a file

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Re^8: how to read multiple line from a file by educated_foo (Vicar) on Apr 14, 2013 at 21:26 UTC
Or you could just look at av.h. How do you think xav_alloc works? Just another Perler interested in Algol Programming.	[reply]
Re^9: how to read multiple line from a file by LanX (Saint) on Apr 14, 2013 at 22:16 UTC
Did I mention that in this case benchmarking goes over theory? Have no time to dig into details, that's why in the meantime I trust others ... see Shift, Pop, Unshift and Push with Impunity!š ... who give me the impression, that Perl arrays have more optimizations than C-Arrays do. > How do you think xav_alloc works? I'm no C-Programmer ... but did I mention that I prefer benchmarking before digging into theory? Cheers Rolf ( addicted to the Perl Programming Language) updates š) excerpt: In comparison, a stack implemented with a perl list will only require reallocations as the list grows larger. However, perl is smartly coded because the use of lists as queues was anticipated. Consequently, these queue-type reallocations have a negligible impact on performance. In benchmarked tests, queue access of a list (using repeated push/shift operations) is nearly as fast as stack access to a list (using repeated push/pop operations). emphasize added!	[reply]
Re^10: how to read multiple line from a file by educated_foo (Vicar) on Apr 16, 2013 at 14:34 UTC
perl is smartly coded because the use of lists as queues was anticipated This is what I meant about memcpy(). I'm surprised that repeatedly shifting an array over doesn't have a noticeable cost, but I believe the numbers. Point taken. Just another Perler interested in Algol Programming.	[reply]

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