[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: nitpick: a=([9223372036854775807]=1 2 3)
|
From: |
Chet Ramey |
|
Subject: |
Re: nitpick: a=([9223372036854775807]=1 2 3) |
|
Date: |
Tue, 16 Dec 2014 22:04:53 -0500 |
|
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 |
On 12/16/14 5:10 PM, Stephane Chazelas wrote:
> bash-4.3$ a=([9223372036854775806]=1 2 3 4)
> bash-4.3$ echo "${!a[@]}"
> -9223372036854775808 -9223372036854775807 9223372036854775806
> 9223372036854775807
>
> That wraps but as signed longs, which means we get negative
> indexes which we can't easily use.
OK. Array indices are arithmetic expressions. From the man page:
"Evaluation is done in fixed-width integers with no check for overflow"
They're not checked.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/