NAME

       B::Hooks::EndOfScope - Execute code after a scope finished compilation

VERSION

       version 0.26

SYNOPSIS

           on_scope_end { ... };

DESCRIPTION

       This module allows you to execute code when perl finished compiling the surrounding scope.

FUNCTIONS

   on_scope_end
           on_scope_end { ... };

           on_scope_end $code;

       Registers $code to be executed after the surrounding scope has been compiled.

       This is exported by default. See Sub::Exporter on how to customize it.

LIMITATIONS

   Pure-perl mode caveat
       This caveat applies to any version of perl where Variable::Magic is unavailable or
       otherwise disabled.

       While Variable::Magic has access to some very dark sorcery to make it possible to throw an
       exception from within a callback, the pure-perl implementation does not have access to
       these hacks. Therefore, what would have been a compile-time exception is instead converted
       to a warning, and your execution will continue as if the exception never happened.

       To explicitly request an XS (or PP) implementation one has two choices. Either to import
       from the desired implementation explicitly:

        use B::Hooks::EndOfScope::XS
          or
        use B::Hooks::EndOfScope::PP

       or by setting $ENV{B_HOOKS_ENDOFSCOPE_IMPLEMENTATION} to either "XS" or "PP".

   Perl 5.8.0 ~ 5.8.3
       Due to a core interpreter bug
        <https://rt.perl.org/Public/Bug/Display.html?id=27040#txn-82797> present in older perl
       versions, the implementation of B::Hooks::EndOfScope deliberately leaks a single empty
       hash for every scope being cleaned. This is done to avoid the memory corruption associated
       with the bug mentioned above.

       In order to stabilize this workaround use of Variable::Magic is disabled on perls prior to
       version 5.8.4. On such systems loading/requesting B::Hooks::EndOfScope::XS explicitly will
       result in a compile-time exception.

   Perl versions 5.6.x
       Versions of perl before 5.8.0 lack a feature allowing changing the visibility of "%^H" via
       setting bit 17 within $^H. As such the only way to achieve the effect necessary for this
       module to work, is to use the "local" operator explicitly on these platforms. This might
       lead to unexpected interference with other scope-driven libraries relying on the same
       mechanism. On the flip side there are no such known incompatibilities at the time this
       note was written.

       For further details on the unavailable behavior please refer to the test file
       t/02-localise.t included with the distribution.

SEE ALSO

       Sub::Exporter

       Variable::Magic

SUPPORT

       Bugs may be submitted through the RT bug tracker
       <https://rt.cpan.org/Public/Dist/Display.html?Name=B-Hooks-EndOfScope> (or
       bug-B-Hooks-EndOfScope@rt.cpan.org <mailto:bug-B-Hooks-EndOfScope@rt.cpan.org>).

AUTHORS

       •   Florian Ragwitz <rafl@debian.org>

       •   Peter Rabbitson <ribasushi@leporine.io>

CONTRIBUTORS

       •   Karen Etheridge <ether@cpan.org>

       •   Christian Walde <walde.christian@googlemail.com>

       •   Graham Knop <haarg@haarg.org>

       •   Simon Wilper <sxw@chronowerks.de>

       •   Tatsuhiko Miyagawa <miyagawa@bulknews.net>

       •   Tomas Doran <bobtfish@bobtfish.net>

COPYRIGHT AND LICENCE

       This software is copyright (c) 2008 by Florian Ragwitz.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.