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unimatrix (1124)

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Journal of unimatrix (1124)

Friday May 18, 2001
03:38 PM

Fun with Attributes

[ #183 ]

Got into attributes today. Damian's Attribute::Handlers really makes this easy. The result so far are the following three modules:

Attribute::TieClasses - attribute wrappers for CPAN Tie classes. The following lines load in Tie::Scalar::Timeout and tie()s $k with those options

            use Attribute::TieClasses;
            my $k : Timeout(EXPIRES => '+2s');

Attribute::Memoize - Attribute interface to

            use Attribute::Memoize;
            sub fib :Memoize {
                            my $n = shift;
                            return $n if $n 2;
                            fib($n-1) + fib($n-2);

Attribute::Abstract - implementing abstract methods with attributes

            package SomeObj;
            use Attribute::Abstract;

            sub new { ... }
            sub write : Abstract;

Now, if properties (in Perl 6 jargon) were modifiable at runtime, it would open the door to aspect-oriented programming. There might be a little talk at YAPC::NA and/or YAPC::Europe on that; so far there is a proof-of-concept implementation of aspects using the flexibility afforded by the debugger. More on that later.