Exception handling syntax: Difference between revisions

Revision as of 23:36, 13 December 2024

Revision as of 03:15, 12 January 2025

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The forms shown above can sometimes fail if the global variable {{Perl2|$@}} is changed between when the exception is thrown and when it is checked in the {{Perl2|if ($@)}} statement. This can happen in multi-threaded environments, or even in single-threaded environments when other code (typically

called in the destruction of some object) resets the global variable before the checking code.

The following example shows a way to avoid this problem (see [https://archive.today/20130415214802/http://www.perlfoundation.org/perl5/index.cgi?exception_handling]{{dead link|date=October 2020}} or [https://stackoverflow.com/a/10343025]; ''cf''. [http://mvp.kablamo.org/essentials/die-eval/]). But at the cost of not being able to use return values:

<syntaxhighlight lang="perl">