I didn't realize till after compiling an example that this was a rather old post, but I'll post it anyway. Here is an example of using attributes to added debug information to a sub (printing out its @_ before and after execution) as well as a way to wrap some errors/warnings around methods. Both of these use Hook::LexWrap to warp extra code around the function being attributed...attributized, attributated?</code>
use strict;
use warnings;
{
package tools;
use Data::Dumper;
use Hook::LexWrap;
use Attribute::Handlers;
sub UNIVERSAL::Debug :ATTR(CODE) {
wrap $_[1], pre => sub { pop; print Dumper({'Pre' => \@_
+ })},
post => sub { pop; print Dumper({'Post' => \@_
+ })},
}
sub UNIVERSAL::Method :ATTR(CODE) {
my ($package, $symbol, $referent, $attr, $data, $phase) =
+@_;
wrap $_[1], pre => sub { my $self = shift;
die "Must be used as a method"
+unless ref($self) eq $package;
};
}
}
{
package Test;
sub method_test :Method {
print "This should be called on a reference\n";
}
}
package main;
sub foo : Debug { print "This is the end!\n"; return 123;};
foo(1,2,3);
my $x = bless {}, 'Test';
$x->method_test();
Test::method_test('hello');
__DATA__
$VAR1 = {
'Pre' => [
1,
2,
3
]
};
This is the end!
$VAR1 = {
'Post' => [
1,
2,
3
]
};
This should be called on a reference
Must be used as a method at attributes.pl line 16.
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