Re: Cannot write data struct to %ENV

%ENV is meant to expose ENV to Perl. In ENV You just cannot have datastructures, only strings. Even if you can add a datastructure to the Perl %ENV hash i think is not a reliable behaviour. %ENV has also a lot of magic underlying: think about case of the keys.

perl -MData::Dumper -e "$ENV{MyExtraConfig} = { foo=>{Bar => 'Blaz'}};
+print Dumper (\%ENV);system qq(set)"
[download]

UPDATE: in the docs is said "As of v5.18.0, both keys and values stored in %ENV are stringified."
L*

There are no rules, there are no thumbs..
Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.

Comment on Re: Cannot write data struct to %ENV Download Code

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Re^2: Cannot write data struct to %ENV by Corion (Patriarch) on Jun 11, 2015 at 09:30 UTC
Cool that you even found the relevant documentation. As I've been playing with magic recently, I think it shouldn't be too hard to make `%ENV` warn if you try to store a reference to it. Of course, this adds another warning, and people who use fatal warnings might break their program, but it was broken beforehand.	[reply] [d/l]
Re^2: Cannot write data struct to %ENV by exilepanda (Friar) on Jun 11, 2015 at 09:47 UTC
Thank you very much!! Now the puzzle is solved and lesson learned. Could you elaborate more about why this is not reliable though?	[reply]
Re^3: Cannot write data struct to %ENV by Discipulus (Canon) on Jun 11, 2015 at 10:03 UTC
If the behaviour change between version of Perl, it is unreliable. In the ENV (of your OS) values will always be stringyfied, older Perl version had permit you to add datastructure to %ENV, but this is not logic as Env will contain only strings. So the behaviour was corrected. See also Environment and wikipedia too. L* There are no rules, there are no thumbs.. Reinvent the wheel, then learn The Wheel; may be one day you reinvent one of THE WHEELS.	[reply] [d/l]


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