Is there a better way to write these bit masks? ``...

# stdlib

[gsala]

Is there a better way to write these bit masks?

val impulseDownAllowed: Boolean = capabilitiesByte and 0x10.toByte() != 0.toByte()
val bleMovementAllowed: Boolean = capabilitiesByte and 0x20.toByte() != 0.toByte()

[elect]

I dealt a lot with that. The best I came up with is this:

val impulseDownAllowed: Boolean = capabilitiesByte has 0x10
val bleMovementAllowed: Boolean = capabilitiesByte has 0x20

[elect]

another variant would be the in operator, but this requires operands inverted

[gsala]

is has your own infix extension function ?

[elect]

yep

[elect]

on the same logic, I also wrote hasnt

[gsala]

I like the idea, thanks!

[elect]

bitwise stuff is a pain in the ass in kotlin. This is one of the few thing Java is still better at.

[elect]

consider voting https://youtrack.jetbrains.com/issue/KT-1440, hopefully we can get this sooner or later

[gsala]

I'd just be happy if I didn't have to do the toByte() call to be honest.

[elect]

I also wrote a .b extension for that 😛

[gsala]

🤯

[gsala]

so now I want to make a function that will give me the value represented by some bits in a byte.
so if I have a Byte 0x10110110 and the spec says Memory size: Bit 0-2   I want to do something like byte.get(0..2) = 0b101
what would you call such a function?
My best call right now is just fun Byte.get(bitRange : IntRange) : Byte

[elect]

hey Gerard, I missed you 😎

[elect]

what about the get operator? byte[0, 2]

[elect]

btw, what are you doing in general? Encoding variable-length-bit data on bytes?

[gsala]

yeah, right now I'm "parsing" the bit data from some bytes

[elect]

one note: since jvm converts integers (Bytes and Shorts) to Int (or Long when needed) to perform arithmetic operations, you should consider returning that

[elizarov]

Yup. You should not need to work with bytes. Bytes are only useful as a storage type when you have arrays with many of them. There’s literally zero need to use byte variables or functions taking/returing bytes for any kind of computation