I'm trying to write some code using

termios

in K/N.

termios

is a struct which has a bitflag field called

c_lflag

; its type is

platform.posix.tcflag_t

which appears to be an int on mac and a uint on linux. I'm trying to do some bit logic like this:

newTermios.c_lflag.and((_ECHO_.or(_ICANON_.or(_IEXTEN_))).inv())

(equivalent to

c_lflag & ~(ECHO | ICNON | IEXTEN)

in C). In order to support both targets, I thought

ECHO.or(...) as tcflag_t

would work, but I'm getting a warning that the cast will never succeed. What's the right solution here?

use

.convert()

Ah, let me try. Thanks!

no worries. there's clearly room for improvement in the docs https://kotlinlang.org/api/latest/jvm/stdlib/kotlinx.cinterop/convert.html

Kotlin doesn't do the modifying casts you see with primitives in other languages (same issue casting int to double). You need the conversion methods, like toDouble. Convert is similar, but it checks the plaform type to convert to.

not to confuse things too much, but

(fun (x: Double) { println(x) } as (Number) -> Unit).invoke(1 as Int)

works 😛