comment on

If you want to know how to create a class-method or object-method that can also work as an independent function, there are two ways I would feel comfortable doing it:

If the function take a constant number of arguments, use that to determine how it was called:

# $obj->fooify(1,2,3) or fooify(10,20,30)
# always expects 3 "real" args
sub fooify {
  my $self;
  $self = shift if @_ == 4;  # if 4 args, the first is the object/clas
+s
  my ($x, $y, $z) = @_;
  # ...
}
[download]

If you can be quite sure the arguments will never be the name of a subclass or an object in a subclass of the class you're in, you can do:
```
sub fooify {
  my $self;
  $self = shift if UNIVERSAL::isa($_[0], __PACKAGE__);
  my ($x, $y, $z) = @_;
  # ...
}
[download]
```

Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart

In reply to Re: OO perl query by japhy
in thread OO perl query by rsennat

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