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Postings from December 2011
On Thu, Dec 22, 2011 at 11:59:15AM -0800, Olivier Mengué wrote:
> With the following expression:
>
> my $x = sub { };
>
> the refcount of $x is 2 instead of 1.
> There is no such problem if the sub, instead of behind a simple sub,
> is a closure.
One reference in the RV, one in the optree of the program.
Since the anonymous function is not a closure it does not need to be
cloned with its pad (environment).
I run into similar problems in the unit tests for Test::Refcount.
To create a trivial coderef with refcount 1 you need to make it a
lexical closure.
my $x = do { my $dummy; sub { undef $dummy; } };
HTH
--
Paul "LeoNerd" Evans
leonerd@leonerd.org.uk
ICQ# 4135350 | Registered Linux# 179460
http://www.leonerd.org.uk/
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