Re^2: Aliasing hash-element and scalar? (Not Solved Yet)

I'm not really sure that Perl syntax allows you to alias hash entry scalars, but you can achieve the effect by using Data::Alias:

use Data::Alias;
use feature 'say';
$baz{'buf'} = 'Hello';
alias $foo{'bar'} = $baz{'buf'};
say $foo{'bar'};
$foo{'bar'} = 'World';
say $baz{'buf'};
$baz{'new'} = 'old';
say $foo{'old'};

__END__
Hello
World
Use of uninitialized value in say at ...
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Re^3: Aliasing hash-element and scalar? (background) by LanX (Saint) on Sep 03, 2018 at 19:27 UTC
Thanks. Background: I was thinking to emulate the Python OO system, and in that language a class attribute can be accessed thru the same mechanism like an instance attribute. Hence assigning `self.class_attr` will change the value for all objects, assigning to `self.obj_attr` only to that specific object. Data::Alias seems like a good idea, unless Python has optional magic `__hooks__` to intercept a get/set on class_attr. In that case I should rather use Tie::Scalar. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply] [d/l] [select]

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Re^3: Aliasing hash-element and scalar? (background)
by LanX (Saint) on Sep 03, 2018 at 19:27 UTC

Background: I was thinking to emulate the Python OO system, and in that language a class attribute can be accessed thru the same mechanism like an instance attribute.

Hence assigning self.class_attr will change the value for all objects, assigning to self.obj_attr only to that specific object.

Data::Alias seems like a good idea, unless Python has optional magic __hooks__ to intercept a get/set on class_attr.

In that case I should rather use Tie::Scalar.

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery
FootballPerl is like chess, only without the dice}

[reply]
[d/l]
[select]