Slicing with Arrow-Operator possible in 5.12?

by LanX (Saint)

on Dec 22, 2008 at 17:06 UTC ( [id://732150]=perlquestion: print w/replies, xml )

Need Help??

LanX has asked for the wisdom of the Perl Monks concerning the following question:

Hi AFAIK it's not possible to produce a array or hashslice with an arrow dereference.

no warnings;
$\="\n";
my $ar=[1..9];
print $ar->[1];
print $ar->[4..5]; # produces warning
print @$ar[4..5];
__END__
2
1
56
[download]

I remember I read somewhere that perl5porters received a patch to enable it and that'll be probably enabled in 5.12.

Couldn't find any infos on this, does anyone have a deeper insight or maybe a link?

Cheers Rolf

Comment on Slicing with Arrow-Operator possible in 5.12? Download Code

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Re: Slicing with Arrow-Operator possible in 5.12? by haoess (Curate) on Dec 22, 2008 at 19:31 UTC
You should start with this mail: For 5.12: clean up dereferencing syntax for slices by Ovid. -- Frank	[reply]
Re^2: Slicing with Arrow-Operator possible in 5.12? by LanX (Saint) on Dec 22, 2008 at 22:35 UTC
Thanks! Unfortunately there seem to be a compability conflict with hashes. For isntance `$hr->{qw/this that/}` already means `$$hr{join $;,qw/this that/}` ! That's an old feature (perl4 ?) for multidimensional hashes `$hash{"this","that"}`! (for more see documentation for $; in perlop)	[reply] [d/l] [select]
Re^3: Slicing with Arrow-Operator possible in 5.12? by dragonchild (Archbishop) on Dec 23, 2008 at 17:40 UTC
You're looking for `@{$hr}{qw/this that/}` My criteria for good software: Does it work? Can someone else come in, make a change, and be reasonably certain no bugs were introduced?	[reply] [d/l]

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