in reply to Selecting Ranges of 2-Dimensional Data

FWIW:

it's possible to alias single array elements 

use warnings;
use strict;
use Data::Dump qw/pp/;

my @a= ('a','b','c','d');

*b = \$a[1];

$b ="X";

pp @a

[download]

("a", "X", "c", "d")

But wasn't able yet to bind the alias to another array element.

But I seem to remember seeing it done in the past ...°

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

update

°) yep, see arr_alias() in Re: Selecting Ranges of 2-Dimensional Data (array of aliases)

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Re^2: Selecting Ranges of 2-Dimensional Data
by haukex (Archbishop) on Oct 26, 2018 at 15:53 UTC

    The following hack passes the tests in the root node:

    use Data::Alias;
sub getsubset {
    my $d = shift;
    alias my @x = @{$$d[1]}[1,2];
    alias my @y = @{$$d[2]}[1,2];
    return [ \@x, \@y ];
}

    [download]
[reply]
[d/l]
      yeah, but I meant without Data::Alias and just with a standard *glob mechanism.

      Cheers Rolf
      (addicted to the Perl Programming Language :)
      Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

[reply]

        Array elements aren't globs, so no.

        It is possible to create an array of aliases without an external module, though. 

        sub getsubset {
    my $d = shift;
    return [
       sub { \@_ }->( @{$$d[1]}[1,2] ),
       sub { \@_ }->( @{$$d[2]}[1,2] ),
    ];
}

        [download]
[reply]
[d/l]

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