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

- NAME
- SYNOPSIS
- DESCRIPTION
  - Methods
    - new
    - push_hook
- AUTHOR
- LICENSE

# 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.

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