Kotlin inline inline function

When to use inline

When a lambda is included in a method parameter 

What is the role of inlining

To improve performance, let's not talk nonsense and go directly to the code

without inlining

import java.util.*

fun main() {

    inlineTest() { result, code ->
        println("resout:$result code:$code")
    }
}

fun inlineTest(res: (String, Int) -> Unit) {
    res("错了错了", 404)
}

View bytecode

 

 Looking at the compiled bytecode, we can know that it is packaged as 

The Function2 object then performs a series of operations. The process is more complicated

plus inline

Re-view the bytecode in the above way

Something magical happened. The code is more concise. Efficiency has also improved.

PS: with or without the effect, the output is the same

resout:错了错了 code:404

refer to:

Kotlin's inline inline
function bilibili