autodie::Scope::GuardStack(3p) Perl Programmers Reference Guide autodie::Scope::GuardStack(3p)

autodie::Scope::GuardStack - Hook stack for managing scopes via %^H

    use autodie::Scope::GuardStack;
    my $stack = autodie::Scope::GuardStack->new
    $^H{'my-key'} = $stack;
    $stack->push_hook(sub {});

This class is a stack of hooks to be called in the right order as scopes go away. The stack is only useful when inserted into "%^H" and will pop hooks as their "scope" is popped. This is useful for uninstalling or reinstalling subs in a namespace as a pragma goes out of scope.

Due to how "%^H" works, this class is only useful during the compilation phase of a perl module and relies on the internals of how perl handles references in "%^H". This module is not a part of autodie's public API.


  my $stack = autodie::Scope::GuardStack->new;

Creates a new "autodie::Scope::GuardStack". The stack is initially empty and must be inserted into "%^H" by the creator.


  $stack->push_hook(sub {});

Add a sub to the stack. The sub will be called once the current compile-time "scope" is left. Multiple hooks can be added per scope

Copyright 2013, Niels Thykier <>

This module is free software. You may distribute it under the same terms as Perl itself.

2023-02-15 perl v5.36.3