-.kt

a little more type protection and avoid dropping down to java reflection

Yeah that’s nicer. 👍

Untitled.m

i got bored with work... more kotlinny

Java is the same, for what it's worth

sounds like you are coming from C#. in kotlin interface MyInterface<T : SomeType> { }

No, there is no such thing. If

SomeType

is an interface you can do

interface MyInterface : SomeType

. Otherwise what you want is not possible and you probably want an abstract class instead.

For extension properties? Where would the

Lazy

instance (ie. the delegate) and its state be stored?

Can contracts really not be used in member functions? This is the first time I've tried, and I was surprised to see an error of

Contracts are only allowed on top level functions

I don't recall reading about this limitation anywhere.

It's the first limitation in the KEEP, says it's because of inheritance: https://github.com/Kotlin/KEEP/blob/master/proposals/kotlin-contracts.md#limitations-and-capabilities-of-the-prototype

Wow, I don't know how many times I've read that and apparently just never paid attention. Thanks!

Okay so I am currently working with the kmath repository on github, and I'm fairly new to gradle. I cant quite get the tag to work in the dependencies portion of my gradle.build does anyone have any advice, if you need more clarification on my problem please let me know

You can create a data class with a private map, and Mark all the fields as "by mapName"

Any advice?

Mistakes

What karel said, with my corrections:

class Foo(var af: Short) {
    val a get() = (af and 0xff).toByte()
set(value) { af = ((af.toInt() and 0xff00) or (value.toInt() and 0xff)).toShort() }
    val f get() = (af ushr 8).toByte()
}

(also Im working with UShort and UByte)

Ah, good choice.

Don't they need to be `var`s now? And does the

ushr

really matter? You're right about the

8

and

0xFf

of course simple smile

They need to be vars.

But UTypes don' have shifts.

😞

It's good practice to use

ushr

regardless when you're just selecting some bits. It hurts my head to think whether it matters or not 😂

They do: https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-u-int/shr.html

@jkbbwr I have a project where I use bitwise math a lot, and i just use

Int

everywhere. Alternatively, UInt will do.

But I want to use specifically sized types

UByte and UShort

@karelpeeters Might be a kt/native limitation then

The thing is that, there is no overhead to using

Int

over

Short

or

Char

or whatever.