What is the :unique attribute for package variables?

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

Yes, today is my day for going through all the perldelta docs and learning all sorts of new things. Well anyway I was reading perl591delta and I read this:

The :unique attribute is only meaningful for globals
Now applying :unique to lexical variables and to subroutines will result in a compilation error.

But a search for unique attribute yields no information.

What exactly is this attribute and how does it work? And where could I have found docs on it?

Carter's compass: I know I'm on the right track when by deleting something, I'm adding functionality

Comment on What is the :unique attribute for package variables?

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Re: What is the :unique attribute for package variables? by princepawn (Parson) on Jun 04, 2007 at 16:11 UTC
Yes, and continuing on my delta safari, I see :unique The :unique attribute has been made a no-op, since its current implementation was fundamentally flawed and not threadsafe. Carter's compass: I know I'm on the right track when by deleting something, I'm adding functionality	[reply]
Re: What is the :unique attribute for package variables? by ForgotPasswordAgain (Vicar) on Jun 04, 2007 at 16:04 UTC
perldoc -f our (found by googling: perl unique attribute globals)	[reply]