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| -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 |