Channels
#getting-started
- v
ValV
10/17/2018, 12:43 AMAnd one more unclear thing: what is
? Some special data construction for reflection? How does it work?KClass - k
karelpeeters
10/17/2018, 12:44 AMIt's like
but with a couple of extra functions and properties.java.lang.Class - k
karelpeeters
10/17/2018, 12:44 AMSo yeah, reflection. - v
ValV
10/17/2018, 12:49 AMThanks, I would notice such analogies, if I knew Java better than Kotlin 😶 - v
ValV
10/17/2018, 1:12 AMDoesn't IDEA generate class diagrams for Kotlin projects, does it? - p
poohbar
10/17/2018, 3:25 AMCopy codeoutput.use { stream -> stream.writer().use { it.write(response) } } - k
keturn
10/17/2018, 3:42 AMI had a similar question about how many levels of
I needed to stack. I think it was with InputStream and Reader instead of Writer, but I expect the same principles apply.use - j
jo
10/17/2018, 3:51 AMBit of an expert novice question: I'd like to map between my classes and instances of those classes inside a Map. I was trying mutableMapof<Foo::class, Foo>(), but am having trouble. Is there another way to quickly (perhaps even without reflection) make that happen? - j
jo
10/17/2018, 3:52 AMFoo, in this case, would actually be a parent class and I'd be mapping subclasses to instances. - s
Shawn
10/17/2018, 3:53 AMI was gonna suggest using
or some variant thereof, but you can’t really have it as a key because type erasureKClass<Foo> - s
Shawn
10/17/2018, 3:53 AMyou’d have to have a wrapper class or something - s
Shawn
10/17/2018, 3:54 AMOr, I suppose, not type erasure - s
Shawn
10/17/2018, 3:54 AMI feel like there’s another confounding factor there - j
jo
10/17/2018, 3:54 AMMy backup is to make a companion object for all the subclasses and give them a unique ID. Gross. - s
Shawn
10/17/2018, 3:55 AMit’d be hard to enforce the type bound there, though - j
jo
10/17/2018, 3:55 AMTo avoid an XY problem, here's what I'm trying to do in the bigger scheme of things: - j
jo
10/17/2018, 3:55 AMI have an entity component system and I need to be able to map from a component to entities that have this component. - s
Shawn
10/17/2018, 3:55 AM
, butMap<KClass<T>, T>where T : Any - j
jo
10/17/2018, 3:55 AMI'll give that a try. - s
Shawn
10/17/2018, 3:56 AM
will yield an instance ofFoo::class
by the way, you can’t use it as a typeKClass<Foo> - j
jo
10/17/2018, 3:57 AMAha! That's what I was doing wrong. - j
jo
10/17/2018, 3:57 AMI had been doing Component::class.java. - j
jo
10/17/2018, 3:59 AMNow I'm left withfun addComponent(c:Component) { ... ? ... } - j
jo
10/17/2018, 4:00 AMOh wait. - j
jo
10/17/2018, 4:01 AMHere's what I want:Map<Class<Component>, Component> - j
jo
10/17/2018, 4:01 AMfun addComponent(c:Component) { this.components.put(c.javaClass, c) } - j
jo
10/17/2018, 4:01 AMThanks! - m
matt tighe
10/17/2018, 10:59 PMif i wanted to simulate an open file for testing purposes, how could i do that? egCopy codeval dest = File("firstfile.txt") val target = File("somefile.txt") target.createNewFile() target.remainOpenTilClosed() dest.write("test") assertFailsWith(SomeException::class, "Could not copy to open file") { dest.copyTo(target, overwrite = true) } target.close() - n
Nikky
10/17/2018, 11:25 PMi'd just make the test clear some directory and set up files there to actually open and do stuff in less simulation and reflects the real usecase more closely - n
Nikky
10/17/2018, 11:26 PMfor that i made a few functions i call in
in spekbeforeEachTest