Comments (6)
$ perl6 -e 'class Foo { submethod private { 42 }; method public { self.private } }; class Bar is Foo { }; say Bar.new.public'
No such method 'private' for invocant of type 'Bar'
in method public at -e:1
in block at -e:1
$ perl6 -e 'class Foo { submethod private { 42 }; method public { self.private } }; class Bar is Foo { submethod private { 666 } }; say Bar.new.public'
666
$ perl6 -e 'class Foo { submethod private { 42 }; method public { self.private } }; class Bar is Foo { method private { 666 } }; say Bar.new.public'
666
So no, I think all of these behaviors are correct.
from p5-mop-redux.
In particular, submethods were never intended to be like private methods. They are intended to support things like BUILD, where every method in an inheritance hierarchy is called (so inheriting individual implementations of BUILD doesn't make sense), or for things like optimized constructors (for instance, we emulate this in Moose by generating a constructor that starts with my $class = shift; return $class->Moose::Object::new(@_) if $class ne __PACKAGE__;
, which is effectively what submethod dispatch inherently does).
We should have some tests for this behavior, though.
from p5-mop-redux.
Hmm, yeah, I think doy is right, at least as far as submethods are concerned. Lets keep this open so that we remember to write tests.
from p5-mop-redux.
Actually, submethods are basically (kinda sorta mostly) lexical subroutines and should (perhaps) be implemented as such. See http://rjbs.manxome.org/rubric/entry/2016 for more info, specifically this bit:
If you make that subroutine lexical, you can't override it in the subclass. In fact, if it's lexical, it won't participate in method dispatch at all, which means you're probably breaking your main class, too! After all, method dispatch starts in the package on which a method was invoked, then works its way up the packages in @inc. Well, package means package variables, and that excludes lexical subroutines.
from p5-mop-redux.
No, they aren't - the whole point is that they are callable from outside of the class, they just aren't inherited. new
as a submethod wouldn't be possible if it was a lexical thing. Private methods and submethods are two separate concepts.
from p5-mop-redux.
Ah yes, you are right, I just saw the "does not participate in method dispatch" and my brain went off on a digression. Ignore my last comment.
On Sep 26, 2013, at 12:25 AM, Jesse Luehrs [email protected] wrote:
No, they aren't - the whole point is that they are callable from outside of the class, they just aren't inherited. new as a submethod wouldn't be possible if it was a lexical thing. Private methods and submethods are two separate concepts.
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from p5-mop-redux.
Related Issues (20)
- methods: (also) take named parameters HOT 3
- Defining multiple attributes with one "has" statement HOT 2
- is ro/rw compatibility with perl 6 HOT 2
- different behaviour for attribute traits for mop and perl 6 HOT 18
- "DEFINE YOUR API YOU LAZY SOD!" HOT 8
- New `mro` method trait HOT 4
- trait -> rw accessors return $self when used as setter HOT 13
- Attributes should be accessible in has initializers HOT 1
- need to check method_class and attribute_class for metaclass compat
- trait keyword HOT 2
- Some errors in attribute declaration silently ignored HOT 2
- Getting the class name I'm compiled into HOT 10
- Methods with empty bodies returning their invocant HOT 1
- Attribute values should be set from constructor arguments prior to default values being applied HOT 4
- better way of accessing attributes in mop-created methods
- There is no way to set the superclass for a class once it's been created HOT 4
- Required method with signatures are not parsed as required
- mop classes appear to be bleeding exports into main:: HOT 4
- Different APIs for required and regular methods HOT 1
- panic: av_extend_guts() negative count HOT 3
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from p5-mop-redux.