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#announcements
- p
pakoito
08/25/2016, 2:36 PMbut my colleague asked whether to keep it like statics in Java - p
pakoito
08/25/2016, 2:36 PMI’ll try to ask him if it’s too much of a change - p
pakoito
08/25/2016, 2:40 PMhe’s okay, patch it into our formatting guide and go ahead with it - p
pakoito
08/25/2016, 2:40 PMthank you both - q
qwoodmansee
08/25/2016, 2:41 PMIs it is possible to configure a property to be set to it's default value if null is passed in (As opposed to getting flagged for a null on a property which is non-null type?) - y
yole
08/25/2016, 2:43 PMyou can write a setter that will implement such logic - q
qwoodmansee
08/25/2016, 2:44 PMIf that is the solution I assume it can not be done with a data class? - y
yole
08/25/2016, 2:46 PMCopy codedata class Foo(private var _s: String = "default") { var s: String? get() = _s set(value) { _s = value ?: "default" } } - q
qwoodmansee
08/25/2016, 2:48 PMto confirm, s will not have its equals()/hashCode() pair generated, correct? - y
yole
08/25/2016, 2:48 PM_s will - y
yole
08/25/2016, 2:48 PMwhich is sufficient - q
qwoodmansee
08/25/2016, 2:48 PMoh i see, yes. Thank you very much - m
michaelrocks
08/25/2016, 3:01 PM@christophsturm: Sure, I understand cons of this solution. But there’re also pros so I think it should be allowed, maybe with some special syntax so that developer’s intentions are explicit. - y
yole
08/25/2016, 3:03 PMso just to make things clear. you can of course access
in a constructorthis - y
yole
08/25/2016, 3:04 PMyou cannot use
in a super constructor parameter list. this is a JVM restriction, there is nothing we could do to change thisthis - m
michaelrocks
08/25/2016, 3:05 PMConsider the following case:Copy codeinterface Test { fun doSomething(): Unit fun onDoSomething(): Unit } class TestMixin : Test { override fun doSomething(): Unit { onDoSomething() } override fun onDoSomething() = Unit } class TestImpl : Test by TestMixin() { override fun onDoSomething(): Unit { /* Impossible to call this method from TestMixin() */ } } - m
michaelrocks
08/25/2016, 3:05 PM@yole: Oh, that’s really disappointing 😞 - y
yole
08/25/2016, 3:05 PMnote that
is not a super constructor parameter listby TestMixin() - y
yole
08/25/2016, 3:06 PMso we could allow to use
there; there is no fundamental reason why it can’t be allowedthis - m
michaelrocks
08/25/2016, 3:06 PMBut how can I pass
to `TestMixin`’s constructor?TestImpl@this - y
yole
08/25/2016, 3:07 PMas I said: we could allow. right now we don't - m
michaelrocks
08/25/2016, 3:07 PMI see. It would be really great if this behavior was allowed. - m
michaelrocks
08/25/2016, 3:07 PMI understand it can be dangerous if used improperly but sometimes it’s really necessary. - y
yole
08/25/2016, 3:09 PMthis is no more dangerous than passing
to any other method that you call from a constructor, or calling a non-final method from a constructorthis - m
michaelrocks
08/25/2016, 3:11 PMAgree 🙂 - m
michaelrocks
08/25/2016, 3:11 PMShould I file an issue? - y
yole
08/25/2016, 3:11 PMplease do,, I wasn’t able to find an existing one - k
kirillrakhman
08/25/2016, 3:11 PMweird, it has surely been discussed before - m
michaelrocks
08/25/2016, 3:12 PMI think so too 🙂 - r
redenergy
08/25/2016, 3:13 PMGood day everyone. I wanted to ask about the state of KT-4900 (Support math operations in stdlib), which seems to be an old task (created in 2014)