What is the purpose of the inline tool in programming or code compilation?

The inline tool in programming and code compilation is used to optimize performance by replacing a function call with its body directly at the call site. This allows:

• Reducing the overhead of function calls (such as jumping and context saving).
• Improving the compiler optimizer's ability to perform further transformations.

In Android development, for example, the inline annotation in Kotlin allows the compiler to insert the function code directly at the call site, which is especially useful for higher-order functions.

Example in Kotlin:

inline fun measureTime(block: () -> Unit) {
    val start = System.nanoTime()
    block()
    val end = System.nanoTime()
    println("Execution time: ${end - start} ns")
}

fun main() {
    measureTime {
        // code whose execution time needs to be measured
    }
}

Here, the measureTime function will be inlined at the call site, reducing call overhead and increasing performance.