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.\" ========================================================================
.\"
.IX Title "curry 3pm"
.TH curry 3pm "2021-01-03" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
curry \- Create automatic curried method call closures for any class or object
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  use curry;
\&
\&  my $code = $obj\->curry::frobnicate(\*(Aqfoo\*(Aq);
.Ve
.PP
is equivalent to:
.PP
.Vb 1
\&  my $code = sub { $obj\->frobnicate(foo => @_) };
.Ve
.PP
Additionally,
.PP
.Vb 1
\&  use curry::weak;
\&
\&  my $code = $obj\->curry::weak::frobnicate(\*(Aqfoo\*(Aq);
.Ve
.PP
is equivalent to:
.PP
.Vb 7
\&  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 => @_)
\&    };
\&  };
.Ve
.PP
If you want to pass a weakened copy of an object to a coderef, use the
\&\f(CW $weak \fR package variable:
.PP
.Vb 1
\& use curry::weak;
\&
\& my $code = $self\->$curry::weak(sub {
\&  my ($self, @args) = @_;
\&  print "$self must still be alive, because we were called (with @args)\en";
\& }, \*(Aqxyz\*(Aq);
.Ve
.PP
which is much the same as:
.PP
.Vb 11
\& my $code = do {
\&  my $sub = sub {
\&   my ($self, @args) = @_;
\&   print "$self must still be alive, because we were called (with @args)\en";
\&  };
\&  Scalar::Util::weaken(my $weak_obj = $self);
\&  sub {
\&   return unless $weak_obj; # in case it already went away
\&   $sub\->($weak_obj, \*(Aqxyz\*(Aq, @_);
\&  }
\& };
.Ve
.PP
There's an equivalent \- but somewhat less useful \- \f(CW $curry \fR package variable:
.PP
.Vb 1
\& use curry;
\&
\& my $code = $self\->$curry::curry(sub {
\&  my ($self, $var) = @_;
\&  print "The stashed value from our \->something method call was $var\en";
\& }, $self\->something(\*(Aqcomplicated\*(Aq));
.Ve
.PP
Both of these methods can also be used if your scalar is a method name, rather
than a coderef.
.PP
.Vb 1
\& use curry;
\&
\& my $code = $self\->$curry::curry($methodname, $self\->something(\*(Aqcomplicated\*(Aq));
.Ve
.SH "RATIONALE"
.IX Header "RATIONALE"
How many times have you written
.PP
.Vb 1
\&  sub { $obj\->something($some, $args, @_) }
.Ve
.PP
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?
.PP
Right. That's why I wrote this.
.SH "AUTHOR"
.IX Header "AUTHOR"
mst \- Matt S. Trout (cpan:MSTROUT) <mst@shadowcat.co.uk>
.SH "CONTRIBUTORS"
.IX Header "CONTRIBUTORS"
None yet \- maybe this software is perfect! (ahahahahahahahahaha)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c) 2012 the curry \*(L"\s-1AUTHOR\*(R"\s0 and \*(L"\s-1CONTRIBUTORS\*(R"\s0
as listed above.
.SH "LICENSE"
.IX Header "LICENSE"
This library is free software and may be distributed under the same terms
as perl itself.