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Re: Why isn't ->can() curried?

by chromatic (Archbishop)
on Jan 20, 2003 at 17:33 UTC ( #228406=note: print w/replies, xml ) Need Help??

in reply to Why isn't ->can() curried?

How do you tell, programatically, whether the function is intended to be called as a method or a function?

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Re^2: Why isn't ->can() curried?
by diotalevi (Canon) on Jan 20, 2003 at 18:03 UTC

    You wouldn't. But then I think it'd be pretty daft to call a method as a function seeing as how the implementing code is expecting an object as the first parameter.

    Seeking Green geeks in Minnesota

      Paint me daft, then, I do it all the time in tests. :)

      Perhaps any extra arguments to can() could be bound to the subref returned. It's a nice idea; it just seems really hard to get super-scary magic right. Here's some untested code that seems somewhat useful:

      use Scalar::Util 'blessed'; sub curried_can { my ($thingie, $func) = splice( @_, 0, 2 ); my $sub = UNIVERSAL::can( $thingie, $func ); # $thingie cannot $func return unless $sub; # first argument is an object return sub { $thingie->$func( @_ ) } if blessed $thingie; # first argument is a class name, no arguments return $sub unless @_; # first argument is a class name, curried arguments return sub { $sub->( @_ ) }; }

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