Is it recommended to write contracts for my functions? I want to have this function ```inline fun me...

# announcements

[jeggy]

Is it recommended to write contracts for my functions?
I want to have this function

inline fun measureTimeMillisWithContract(block: () -> Unit): Long {
    contract {
        callsInPlace(block, EXACTLY_ONCE)
    }
    val start = System.currentTimeMillis()
    block()
    return System.currentTimeMillis() - start
}

but as it requires me to add the @ExperimentalContracts annotation, I don't really feel good to use contracts.

[nanodeath]

it is weird the built-in measureTimeMillis doesn't have this already

[jeggy]

I found an issue for it on youtrack, they didn't want to change it for compatability policy. But I think it's in Kotlin 1.4
https://youtrack.jetbrains.com/issue/KT-27856

[ephemient]

https://github.com/JetBrains/kotlin/blob/master/libraries/stdlib/jvm/src/kotlin/system/Timing.kt yep

[ilya.gorbunov]

it is weird the built-in measureTimeMillis doesn't have this already

Does have it already:
https://kotlinlang.slack.com/archives/C0922A726/p1597687744182700