Scope::Guard(3pm)					User Contributed Perl Documentation					 Scope::Guard(3pm)

NAME

       Scope::Guard - lexically-scoped resource management

SYNOPSIS

	   my $guard = guard { ... };

	     # or

	   my $guard = scope_guard &handler;

	     # or

	   my $guard = Scope::Guard->new(sub { ... });

	   $guard->dismiss(); # disable the handler

DESCRIPTION

       This module provides a convenient way to perform cleanup or other forms of resource management at the end of a scope. It is particularly
       useful when dealing with exceptions: the "Scope::Guard" constructor takes a reference to a subroutine that is guaranteed to be called even
       if the thread of execution is aborted prematurely. This effectively allows lexically-scoped "promises" to be made that are automatically
       honoured by perl's garbage collector.

       For more information, see: <http://www.drdobbs.com/cpp/184403758>

METHODS

   new
	   my $guard = Scope::Guard->new(sub { ... });

	     # or

	   my $guard = Scope::Guard->new(&handler);

       The "new" method creates a new "Scope::Guard" object which calls the supplied handler when its "DESTROY" method is called, typically at the
       end of the scope.

   dismiss
	   $guard->dismiss();

	     # or

	   $guard->dismiss(1);

       "dismiss" detaches the handler from the "Scope::Guard" object. This revokes the "promise" to call the handler when the object is destroyed.

       The handler can be re-enabled by calling:

	   $guard->dismiss(0);

EXPORTS

   guard
       "guard" takes a block and returns a new "Scope::Guard" object. It can be used as a shorthand for:

	   Scope::Guard->new(...)

       e.g.

	   my $guard = guard { ... };

       Note: calling "guard" anonymously, i.e. in void context, will raise an exception.  This is because anonymous guards are destroyed
       immediately (rather than at the end of the scope), which is unlikely to be the desired behaviour.

   scope_guard
       "scope_guard" is the same as "guard", but it takes a code ref rather than a block.  e.g.

	   my $guard = scope_guard &handler;

       or:

	   my $guard = scope_guard sub { ... };

       or:

	   my $guard = scope_guard $handler;

       As with "guard", calling "scope_guard" in void context will raise an exception.

VERSION

       0.20

SEE ALSO

       o   B::Hooks::EndOfScope

       o   End

       o   Guard

       o   Hook::Scope

       o   Object::Destroyer

       o   Perl::AtEndOfScope

       o   ReleaseAction

       o   Scope::local_OnExit

       o   Scope::OnExit

       o   Sub::ScopeFinalizer

       o   Value::Canary

AUTHOR

       chocolateboy <chocolate@cpan.org>

COPYRIGHT

       Copyright (c) 2005-2010, chocolateboy.

       This module is free software. It may be used, redistributed and/or modified under the same terms as Perl itself.

perl v5.10.1							    2010-05-16							 Scope::Guard(3pm)