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LOL, you beat me by only a few minutes, I was just going to posts this.

#!/usr/bin/perl use strict; use warnings; use Test::More tests => 3; { package Test; use Attribute::Handlers; sub curry : ATTR(CODE) { my ($package, $symbol, $referent, $attr, $data, $phase) = @_; my @args = split(//, $data); my $num_args = scalar(@args); my $func = *{$symbol}{NAME}; no strict 'refs'; no warnings 'redefine'; *{"${package}::${func}"} = sub { if (scalar(@_) == $num_args) { goto $referent; } else { my @args = @_; return sub { $referent->(@args, @_); }; } }; } sub foo : curry('$$$') { return @_; } } is_deeply( [ Test::foo(1, 2, 3) ], [ 1, 2, 3 ], '... got the right return value'); my $curried_foo = Test::foo(1, 2); is(ref($curried_foo), 'CODE', '... this is our curried sub'); is_deeply( [ $curried_foo->(3) ], [ 1, 2, 3 ], '... got the right return value now'); 1;

Although to be honest, neither of our implementations, nor Tom's do what Haskell and Standard ML do, which is too keep currying until all the functions arguments are satisfied.

my $curried_foo = foo(1); my $even_more_curried_foo = $curried_foo->(2); print $even_more_curried_foo->(3); # now we execute the function
And from my (limited) understanding of prototypes, it seems that this may not be possible since seems it is difficult to assign an attribute to a closure.

-stvn

In reply to Re^3: Near-free function currying in Perl by stvn
in thread Near-free function currying in Perl by tmoertel

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