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.\" ========================================================================
.\"
.IX Title "autodie::Scope::GuardStack 3perl"
.TH autodie::Scope::GuardStack 3perl "2021-09-24" "perl v5.32.1" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
autodie::Scope::GuardStack \-  Hook stack for managing scopes via %^H
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 3
\&    use autodie::Scope::GuardStack;
\&    my $stack = autodie::Scope::GuardStack\->new
\&    $^H{\*(Aqmy\-key\*(Aq} = $stack;
\&
\&    $stack\->push_hook(sub {});
.Ve
.SH "DESCRIPTION"
.IX Header "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 \f(CW\*(C`%^H\*(C'\fR
and will pop hooks as their \*(L"scope\*(R" is popped.  This is useful for
uninstalling or reinstalling subs in a namespace as a pragma goes
out of scope.
.PP
Due to how \f(CW\*(C`%^H\*(C'\fR 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 \f(CW\*(C`%^H\*(C'\fR.  This module is not a part of
autodie's public \s-1API.\s0
.SS "Methods"
.IX Subsection "Methods"
\fInew\fR
.IX Subsection "new"
.PP
.Vb 1
\&  my $stack = autodie::Scope::GuardStack\->new;
.Ve
.PP
Creates a new \f(CW\*(C`autodie::Scope::GuardStack\*(C'\fR.  The stack is initially
empty and must be inserted into \f(CW\*(C`%^H\*(C'\fR by the creator.
.PP
\fIpush_hook\fR
.IX Subsection "push_hook"
.PP
.Vb 1
\&  $stack\->push_hook(sub {});
.Ve
.PP
Add a sub to the stack.  The sub will be called once the current
compile-time \*(L"scope\*(R" is left.  Multiple hooks can be added per scope
.SH "AUTHOR"
.IX Header "AUTHOR"
Copyright 2013, Niels Thykier <niels@thykier.net>
.SH "LICENSE"
.IX Header "LICENSE"
This module is free software.  You may distribute it under the
same terms as Perl itself.