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Ovid (2709)

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Stuff with the Perl Foundation. A couple of patches in the Perl core. A few CPAN modules. That about sums it up.

Journal of Ovid (2709)

Sunday October 02, 2005
10:15 PM

Anyone using Sub::Signatures?

[ #26971 ]

I strongly suspect the number of people using Sub::Signatures hovers around zero, give or take none. Given this "fact" and the warnings posted in the documentation, I feel reasonably comfortable contemplating a backwards-incompatible API change. Essentially, I want to remove all type checking of arguments. Dispatching on argument type was fundamentally flawed both in my implementation and in my failure to appreciate allomorphic interfaces (in other words, if I pass an object that can do something I want, I don't care about its class).

If you've not heard of it, this module does this:

use Sub::Signatures;

sub foo($bar) {
    print "$bar\n";

sub foo($bar, $baz) {
    print "$bar, $baz\n";

foo(1);     # prints 1
foo(2,3);   # prints 2, 3
foo(2,3,4); # fatal error (at runtime)

With my contemplated change, that's all it would be able to do: method and subroutine dispatch based on the number of arguments (possibly with an optional "fallback" method).

Note: yes, it's a source filter and yes, I've heard the arguments. This post is merely to ask if anyone uses this module, not to debate its merits.

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