trusty (3) Sub::Defer.3pm.gz

Provided by: libmoo-perl_1.004002-1_all bug

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.


       See Moo for the copyright and license.