1curry(3)              User Contributed Perl Documentation             curry(3)
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NAME

6       curry - Create automatic curried method call closures for any class or
7       object
8

SYNOPSIS

10         use curry;
11
12         my $code = $obj->curry::frobnicate('foo');
13
14       is equivalent to:
15
16         my $code = sub { $obj->frobnicate(foo => @_) };
17
18       Additionally,
19
20         use curry::weak;
21
22         my $code = $obj->curry::weak::frobnicate('foo');
23
24       is equivalent to:
25
26         my $code = do {
27           Scalar::Util::weaken(my $weak_obj = $obj);
28           sub {
29             return unless $weak_obj; # in case it already went away
30             $weak_obj->frobnicate(foo => @_)
31           };
32         };
33
34       If you want to pass a weakened copy of an object to a coderef, use the
35       $weak  package variable:
36
37        use curry::weak;
38
39        my $code = $self->$curry::weak(sub {
40         my ($self, @args) = @_;
41         print "$self must still be alive, because we were called (with @args)\n";
42        }, 'xyz');
43
44       which is much the same as:
45
46        my $code = do {
47         my $sub = sub {
48          my ($self, @args) = @_;
49          print "$self must still be alive, because we were called (with @args)\n";
50         };
51         Scalar::Util::weaken(my $weak_obj = $self);
52         sub {
53          return unless $weak_obj; # in case it already went away
54          $sub->($weak_obj, 'xyz', @_);
55         }
56        };
57
58       There's an equivalent - but somewhat less useful -  $curry  package
59       variable:
60
61        use curry;
62
63        my $code = $self->$curry::curry(sub {
64         my ($self, $var) = @_;
65         print "The stashed value from our ->something method call was $var\n";
66        }, $self->something('complicated'));
67
68       Both of these methods can also be used if your scalar is a method name,
69       rather than a coderef.
70
71        use curry;
72
73        my $code = $self->$curry::curry($methodname, $self->something('complicated'));
74

RATIONALE

76       How many times have you written
77
78         sub { $obj->something($some, $args, @_) }
79
80       or worse still needed to weaken it and had to check and re-check your
81       code to be sure you weren't closing over things the wrong way?
82
83       Right. That's why I wrote this.
84

AUTHOR

86       mst - Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk>
87

CONTRIBUTORS

89       None yet - maybe this software is perfect! (ahahahahahahahahaha)
90

92       Copyright (c) 2012 the curry "AUTHOR" and "CONTRIBUTORS" as listed
93       above.
94

LICENSE

96       This library is free software and may be distributed under the same
97       terms as perl itself.
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101perl v5.30.0                      2019-07-26                          curry(3)
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