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

# NAME

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

# SYNOPSIS

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

# DESCRIPTION

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.

## Methods

new

      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.

push_hook

      $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

# AUTHOR

Copyright 2013, Niels Thykier <niels@thykier.net>

# LICENSE

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

2025-01-28 | perl v5.40.1