curry

curry(3pm)            User Contributed Perl Documentation           curry(3pm)

NAME
       curry - Create automatic curried method call closures for any class or
       object

SYNOPSIS
         use curry;

         my $code = $obj->curry::frobnicate('foo');

       is equivalent to:

         my $code = sub { $obj->frobnicate(foo => @_) };

       Additionally,

         use curry::weak;

         my $code = $obj->curry::weak::frobnicate('foo');

       is equivalent to:

         my $code = do {
           Scalar::Util::weaken(my $weak_obj = $obj);
           sub {
             return unless $weak_obj; # in case it already went away
             $weak_obj->frobnicate(foo => @_)
           };
         };

       If you want to pass a weakened copy of an object to a coderef, use the
       $weak  package variable:

        use curry::weak;

        my $code = $self->$curry::weak(sub {
         my ($self, @args) = @_;
         print "$self must still be alive, because we were called (with @args)\n";
        }, 'xyz');

       which is much the same as:

        my $code = do {
         my $sub = sub {
          my ($self, @args) = @_;
          print "$self must still be alive, because we were called (with @args)\n";
         };
         Scalar::Util::weaken(my $weak_obj = $self);
         sub {
          return unless $weak_obj; # in case it already went away
          $sub->($weak_obj, 'xyz', @_);
         }
        };

       There's an equivalent - but somewhat less useful -  $curry  package
       variable:

        use curry;

        my $code = $self->$curry::curry(sub {
         my ($self, $var) = @_;
         print "The stashed value from our ->something method call was $var\n";
        }, $self->something('complicated'));

       Both of these methods can also be used if your scalar is a method name,
       rather than a coderef.

        use curry;

        my $code = $self->$curry::curry($methodname, $self->something('complicated'));

RATIONALE
       How many times have you written

         sub { $obj->something($some, $args, @_) }

       or worse still needed to weaken it and had to check and re-check your
       code to be sure you weren't closing over things the wrong way?

       Right. That's why I wrote this.

AUTHOR
       mst - Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk>

CONTRIBUTORS
       None yet - maybe this software is perfect! (ahahahahahahahahaha)

COPYRIGHT
       Copyright (c) 2012 the curry "AUTHOR" and "CONTRIBUTORS" as listed
       above.

LICENSE
       This library is free software and may be distributed under the same
       terms as perl itself.

perl v5.26.1                      2018-01-21                        curry(3pm)