May 2014 Archives

mop problem 3 - class, extends, and method keyword should be independent from mop

By Yuki Kimoto on May 29, 2014 4:41 AM

mop provide class, extends, and method keyword to perl. but I think these keyword should be independent from mop because these keyword is useful for non-mop modules.

I opposite only mop use these keywords. I hope these keyword is used for other modules the keywords need.

For example, current hash based module is rewrite in the following way.

Before:

package Point3D;
use Object::Simple -base => 'Point';

has z => 1;

sub clear {

  my $self = shift;

  ...

}

After:

use Object::Simple::Syntax;

class…

3 comments

mop problem 2 - Can't weaken attribute variable from outside

By Yuki Kimoto on May 8, 2014 8:57 AM

mop can't weaken attribute variable from outside. mop have weaken feature, but this is defined in only class and this work only when value is set. We can't weaken attribute from outside. This is not useful and some problems will occur.

# Hash base object
my $point = Point->new;
my $foo = {bar => 1};
$point->foo($foo);
weaken $point->{foo};

# mop

# We can't weaken attribute variable from outside of object.

Perl garbage collection is reference-count type. This mean if objects is referenced each other(A -> B -> A) or circle(A -> B -> C ->A), object is no…