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| author | Mike Guy <mjtg@cam.ac.uk> | 2006-01-03 19:18:41 +0000 |
|---|---|---|
| committer | Steve Peters <steve@fisharerojo.org> | 2006-01-03 20:03:49 +0000 |
| commit | f4551fcd8535f92b446c0bbb84dfd670a1f3eece (patch) | |
| tree | c6b4c6c1d9ba9a0a8f8f5a2e228e8468068cb6c4 /pod/perlobj.pod | |
| parent | e5ce394ccbcb3ef5a450374c9a26bafe8a88dfa7 (diff) | |
| download | perl-f4551fcd8535f92b446c0bbb84dfd670a1f3eece.tar.gz | |
Re: [perl #38034] A combination eval, DESTROY method and $@ - dangerous - bug
Message-Id: <E1Etrg9-0005XE-LZ@libra.cus.cam.ac.uk>
p4raw-id: //depot/perl@26625
Diffstat (limited to 'pod/perlobj.pod')
| -rw-r--r-- | pod/perlobj.pod | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/pod/perlobj.pod b/pod/perlobj.pod index bcf56a7a1c..6cfa20ce8e 100644 --- a/pod/perlobj.pod +++ b/pod/perlobj.pod @@ -456,6 +456,11 @@ manipulating C<$_[0]> within the destructor. The object itself (i.e. the thingy the reference points to, namely C<${$_[0]}>, C<@{$_[0]}>, C<%{$_[0]}> etc.) is not similarly constrained. +Since DESTROY methods can be called at unpredictable times, it is +important that you localise any global variables that the method may +update. In particular, localise C<$@> if you use C<eval {}> and +localise C<$?> if you use C<system> or backticks. + If you arrange to re-bless the reference before the destructor returns, perl will again call the DESTROY method for the re-blessed object after the current one returns. This can be used for clean delegation of |