Sub::Defer(3)						User Contributed Perl Documentation					     Sub::Defer(3)

NAME

       Sub::Defer - defer generation of subroutines until they are first called

SYNOPSIS

	use Sub::Defer;

	my $deferred = defer_sub 'Logger::time_since_first_log' => sub {
	   my $t = time;
	   sub { time - $t };
	};

	 Logger->time_since_first_log; # returns 0 and replaces itself
	 Logger->time_since_first_log; # returns time - $t

DESCRIPTION

       These subroutines provide the user with a convenient way to defer creation of subroutines and methods until they are first called.

SUBROUTINES

   defer_sub
	my $coderef = defer_sub $name => sub { ... };

       This subroutine returns a coderef that encapsulates the provided sub - when it is first called, the provided sub is called and is -itself-
       expected to return a subroutine which will be goto'ed to on subsequent calls.

       If a name is provided, this also installs the sub as that name - and when the subroutine is undeferred will re-install the final version
       for speed.

   undefer_sub
	my $coderef = undefer_sub &Foo::name;

       If the passed coderef has been deferred this will "undefer" it.	If the passed coderef has not been deferred, this will just return it.

       If this is confusing, take a look at the example in the "SYNOPSIS".

   undefer_all
	undefer_all();

       This will undefer all defered subs in one go.  This can be very useful in a forking environment where child processes would each have to
       undefer the same subs.  By calling this just before you start forking children you can undefer all currently deferred subs in the parent so
       that the children do not have to do it.

SUPPORT

       See Moo for support and contact information.

AUTHORS

       See Moo for authors.

COPYRIGHT AND LICENSE

       See Moo for the copyright and license.

perl v5.18.2							    2013-12-31							     Sub::Defer(3)