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This is kind of cool, but I've been severely bitten by source filters in the past, and continue to have a number of personal stylistic issues with using them. What I'd like to see (and if someone knows of a CPAN module that does this, I'd be grateful) is something that would allow subs to be written thusly:

use Verifier; my $verify = new Verifier (on_failure => sub { die(join (',',@_)) }) sub foobar { ## The '-' in front of hashref means $bar is an optional paramater my ($foo, $bar) = $verify->type ( \@_, qw/scalar -hashref/); print "Using $foo:\n"; return $foo unless %$bar; for (keys %$bar) { print "$_ => $$bar{$_}\n" } return $$bar{'result'}; }

That is, I'd really like to see verification of parameter types handled by a verifier object rather than by a source filter. Yes, I know it's not quite the same thing; but by eval'ing the type verifier call, one could achieve the same basic functionality.

Update: It turns out, thanks to a mention by dragonchild and xdg, that Params::Validate does just the above. An example of the above code, but using that CPAN module, can be found a bit further down in this discussion.

radiantmatrix
require General::Disclaimer;
s//2fde04abe76c036c9074586c1/; while(m/(.)/g){print substr(' ,JPacehklnorstu',hex($1),1)}


In reply to Re: Use method/function signatures with Perl by radiantmatrix
in thread Use method/function signatures with Perl by Ovid

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