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  • x

    xenoterracide

    01/10/2019, 8:01 PM
    are inner classes also singletons? I would presume so
  • x

    xenoterracide

    01/10/2019, 8:01 PM
    (wonder’s why the term 
    singleton
    wasn’t chosen)
  • k

    karelpeeters

    01/10/2019, 8:03 PM
    Inner classes aren't singletons, there can be multiple instances of them, even per parent instance.
  • k

    karelpeeters

    01/10/2019, 8:05 PM
    inner object
    doesn't compile, is there a reason for that or has there been any discussion on this? I came accross a use case when trying to get a DSL to be more readable, to provide a forced grouping of actions in a child-dsl: Posted in #general
  • k

    karelpeeters

    01/10/2019, 8:05 PM
    I've asked about `inner object`s a couple of times before in #language-proposals.
  • x

    xenoterracide

    01/10/2019, 8:06 PM
    so a 
    companion object
    isn’t a singleton? strange…
  • k

    karelpeeters

    01/10/2019, 8:06 PM
    It is. An 
    inner class
    is something different though: https://kotlinlang.org/docs/reference/nested-classes.html#inner-classes
  • x

    xenoterracide

    01/10/2019, 8:08 PM
    oh, ok
  • j

    jerome moulin

    11/21/2020, 3:48 PM
    (je ne sais pas si il est privé ^^)
  • o

    oday

    11/21/2020, 7:59 PM
    congrats @elizarov on new project lead for Kotlin, just saw on Twitter
  • n

    Nikky

    11/22/2020, 3:48 AM
    i am slightly confused at what i can do with annotations what i want is this: 
    List<@MyAnnotation String>
    and there seems to be a target for that: 
    AnnotationTarget.TYPE
    but i am not entirely sure this is available at runtime or how to retrieve thisi n Lists and Maps (the only way i can guess that this is the right target is because idea autofixes this for me) there is also the target 
    TYPE_PARAMETER
    which is labeled as 
    unsupported yet
    if this is truly unsupported then the best option would be some wrapper annotations like 
    @ListElement
    , 
    @MapKey
    , 
    @MapValue
    but the limitations of no supertypes on annotations and cannot use 
    Array<Annotation>
    as parameter would force me to add a field for every annotation type i want to add and then i cannot have default values on annotation classes.. leading the user to have to add 20+ (exaggerated) empty arays in the arguments any suggestions for how to solve this.. cleanly ?
  • p

    Priyank Jain

    11/22/2020, 11:00 AM
    Hello all. I am developing a karaoke application in which user can sing with the background music with both video and audio. It is just like one popular application on the Play store StarMaker. But the thing is I am unable to find any library which can do recording and playback with live feedback of own voice in-ear, with music and voice synchronization. StarMaker is actually doing that all of that in realtime. So can anyone tell me about any library or any source from where I can develop a karaoke application?
  • a

    Alexander Karkossa

    11/23/2020, 1:00 AM
    message has been deleted
  • a

    Alexander Karkossa

    11/23/2020, 1:00 AM
    Copy code
    > Task :app:compileDebugKotlin

e: java.lang.IllegalStateException: Backend Internal error: Exception during code generation
The root cause java.lang.RuntimeException was thrown at: org.jetbrains.kotlin.backend.jvm.codegen.FunctionCodegen.generate(FunctionCodegen.kt:50)
....
Caused by: java.lang.RuntimeException: Exception while generating code for:
FUN GENERATED_DATA_CLASS_MEMBER name:toString visibility:public modality:OPEN <> ($this:xx.xxxx.xxxx.xxxx.xx.xxxx.Xxxxx) returnType:kotlin.String
  overridden:
    public open fun toString (): kotlin.String declared in kotlin.Any
  $this: VALUE_PARAMETER name:<this> type:xx.xxxx.xxxx.xxxx.xx.xxxx.Xxxxx
  BLOCK_BODY
    RETURN type=kotlin.Nothing from='public open fun toString (): kotlin.String declared in xx.xxxx.xxxx.xxxx.xx.xxxx.Xxxxx'
      CALL 'public final fun toString (): kotlin.String declared in java.lang.StringBuilder' type=kotlin.String origin=null
        $this: CALL 'public final fun append (value: kotlin.String): java.lang.StringBuilder declared in java.lang.StringBuilder' type=java.lang.StringBuilder origin=null
          $this: CALL 'public final fun append (value: kotlin.Any?): java.lang.StringBuilder declared in java.lang.StringBuilder' type=java.lang.StringBuilder origin=null
            $this: CALL 'public final fun append (value: kotlin.String): java.lang.StringBuilder declared in java.lang.StringBuilder' type=java.lang.StringBuilder origin=null
              $this: CALL 'public final fun append (value: kotlin.String): java.lang.StringBuilder declared in java.lang.StringBuilder' type=java.lang.StringBuilder origin=null
                $this: CALL 'public final fun append (value: kotlin.Any?): java.lang.StringBuilder declared in java.lang.StringBuilder' type=java.lang.StringBuilder origin=null
                  $this: CALL 'public final fun append (value: kotlin.String): java.lang.StringBuilder declared in java.lang.StringBuilder' type=java.lang.StringBuilder origin=null
                    $this: CALL 'public final fun append (value: kotlin.String): java.lang.StringBuilder declared in java.lang.StringBuilder' type=java.lang.StringBuilder origin=null
....
Few 1000 lines
....

	      value: CALL 'public final fun String$583$str$fun-toString$class-Xxxxx (): kotlin.String declared in xx.xxxx.xxxx.xxxx.xx.xxxx.LiveLiterals$XxxxxKt' type=kotlin.String origin=null
                $this: GET_FIELD 'FIELD FIELD_FOR_OBJECT_INSTANCE name:INSTANCE type:xx.xxxx.xxxx.xxxx.xx.xxxx.LiveLiterals$XxxxxKt visibility:public [final,static]' type=xx.xxxx.xxxx.xxxx.xx.xxxx.LiveLiterals$XxxxxKt origin=null
            value: GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:nopoxRezDosageEntry type:<http://kotlin.Int|kotlin.Int>? visibility:private [final]' type=<http://kotlin.Int|kotlin.Int>? origin=null
              receiver: GET_VAR '<this>: xx.xxxx.xxxx.xxxx.xx.xxxx.Xxxxx declared in xx.xxxx.xxxx.xxxx.xx.xxxx.Xxxxx.toString' type=xx.xxxx.xxxx.xxxx.xx.xxxx.Xxxxx origin=null
          value: CALL 'public final fun String$585$str$fun-toString$class-Xxxxx (): kotlin.String declared in xx.xxxx.xxxx.xxxx.xx.xxxx.LiveLiterals$XxxxxKt' type=kotlin.String origin=null
            $this: GET_FIELD 'FIELD FIELD_FOR_OBJECT_INSTANCE name:INSTANCE type:xx.xxxx.xxxx.xxxx.xx.xxxx.LiveLiterals$XxxxxKt visibility:public [final,static]' type=xx.xxxx.xxxx.xxxx.xx.xxxx.LiveLiterals$XxxxxKt origin=null


	at org.jetbrains.kotlin.backend.jvm.codegen.ClassCodegen.generateMethod(ClassCodegen.kt:285)
	at org.jetbrains.kotlin.backend.jvm.codegen.ClassCodegen.generate(ClassCodegen.kt:123)
	at org.jetbrains.kotlin.backend.jvm.JvmBackendFacade.doGenerateFilesInternal$backend_jvm(JvmBackendFacade.kt:139)
	... 37 more
Caused by: java.lang.StackOverflowError
	at org.jetbrains.kotlin.ir.declarations.impl.IrDeclarationBase.getParent(IrDeclarationBase.kt:39)
	at org.jetbrains.kotlin.backend.jvm.intrinsics.IrIntrinsicMethods$Companion.toKey(IrIntrinsicMethods.kt:220)
	at org.jetbrains.kotlin.backend.jvm.intrinsics.IrIntrinsicMethods$Companion.access$toKey(IrIntrinsicMethods.kt:211)
	at org.jetbrains.kotlin.backend.jvm.intrinsics.IrIntrinsicMethods.getIntrinsic(IrIntrinsicMethods.kt:157)
  • u

    user

    11/23/2020, 1:24 PM
    https://twitter.com/kotlin/status/1330864740164378624 1.4.20 is released! ✅ Supporting new JVM features, like string concatenation via invokedynamic. ✅ Improved performance and exception handling for KMM projects. ✅ Extensions for JDK Path: Path("dir") / "file.txt". Check out the blog post for more ⬇️ https://t.co/PNn3vOUD8z Twitter
    🚀 6
    ⏩ 1
  • b

    Brian Dilley

    11/23/2020, 10:36 PM
    List
    is unmodifiable
  • b

    Brian Dilley

    11/23/2020, 10:36 PM
    MutableList
    is modifiable
  • b

    Brian Dilley

    11/23/2020, 10:37 PM
    so, 
    listOf(….)
    gives you an immutable (unmodifiable) 
    List
  • b

    Brian Dilley

    11/23/2020, 10:37 PM
    if you have a 
    MutableList
    - just cast it as a 
    List
    and it’s no longer modifiable
    🧵 8
  • k

    Kirill Grouchnikov

    11/23/2020, 10:40 PM
    And I'm not sure what you mean by "just cast it". In the same way it can be "just cast" back to 
    ModifiableList
    unless I'm misunderstanding the compile time distinction of it
  • b

    Big Chungus

    11/24/2020, 10:10 AM
    As commonizer develops, is there any hope for implicit platforms for published libraries? i.e. I write a lib that has all its code in commonMain sourceSet (no platform-specific dependencies) and as an author, I only declare JS & WASM32 targets. However since all metadata is available for all other targets, it should be possible to build platform-specific artefacts (i.e. JVM) on the consumer's side, even if the author didn't publish JVM artefact. Thoughts? This might require changing the way how libraries are published at the moment, instead of publishing platform-specific artefacts and simply choosing between flavours at consumer end, it could publish main klib artefact (that has common code) and platform-specific "appendixes". These could be then used on consumer size to figure out what platforms the lib can support (in case of common-only code this should be all platforms) and generate required platform-specific artefacts. Basically lowest common denominator problem
  • u

    user

    11/24/2020, 12:25 PM
    https://twitter.com/kotlin/status/1331212369339551749 Kotlin 1.4.20 is packed with great stuff for #KMM users! 🤩 We’ve collected all the #KMM updates in Kotlin 1.4.20 on one page so you can get up to speed quickly and not miss anything. 😎 Check it out ➡️ https://t.co/PRiNwSty5s https://t.co/Rd5Di6KpfP Twitter
    ❤️ 5
  • u

    user

    11/25/2020, 2:33 PM
    https://twitter.com/kotlin/status/1331606945015476224 Check out this video about @NetEaseCloud, the largest music platform in China, and how they use Kotlin to deliver amazing music to their 800 million users. Twitter 📱 Create better app experiences with #Kotlin NetEase Cloud Music, one of the largest music platforms in China, w… https://twitter.com/i/web/status/1329586030362697728 Twitter
  • u

    user

    11/25/2020, 2:50 PM
    https://twitter.com/kotlin/status/1331611113750990851 Want to split a collection into a list of lists with custom size? Use the "chunked" function: https://t.co/KzxOw6x3s1 Need a list of sliding window snapshots with overlap (and custom step size)? Use "windowed": https://t.co/mQ59SmshHB They can also apply transformations directly! https://t.co/2KsBAXuUnJ Twitter
  • u

    user

    11/25/2020, 6:00 PM
    https://twitter.com/kotlin/status/1331659123100962817 👨‍💻 Join our series of webinars about server-side development with Kotlin. Speakers from JetBrains, Google, and Confluent will guide you through essential backend development topics. Find out more in this blog post ⬇️ https://t.co/ROQTy5mFVu Twitter
  • u

    user

    11/26/2020, 8:28 AM
    https://twitter.com/kotlin/status/1331877400288899074 Think about data caching in your #KMM project?🤔 Try SQLDelight from @CashApp! Make typesafe Kotlin APIs from SQL statements. Get schema, statements, and migrations verified at compile-time and enjoy IDE features that help you write and maintain SQL. ➡️ https://t.co/GjHFuVDSmw Twitter
    👍 1
  • j

    Jrichards1408

    11/26/2020, 2:49 PM
    Hi i have see some examples code that creates objects like this?
    Copy code
    val (firsy, rest) = value.split(" ", limit = 2)
  • j

    Jrichards1408

    11/26/2020, 2:50 PM
    Copy code
    val first;
val rest;
    ??
  • j

    Jrichards1408

    11/26/2020, 2:51 PM
    Ok thanks
  • t

    trathschlag

    11/26/2020, 10:08 PM
    Cool:
    Copy code
    class MySingleMethodClass(dependency: Dependency) : (Int) -> String by { dependency.extractStringFromInt(it) }
    Useful for:
    Copy code
    fun stuff(printHello: () -> Unit, wipeDisk: () -> Unit) { ... }
...
val wipeDisk = getWipeDisk(dependency)
val printHello = getPrintHello(dependency)
stuff(wipeDisk, printHello) // ooops...

// now with types:

fun stuff(printHello: PrintHello, wipeDisk: WipeDisk) { ... }
...
val wipeDisk = WipeDisk(dependency)
val printHello = PrintHello(dependency)
stuff(wipeDisk, printHello) // does not compile
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