Can you explain the purpose and features of using the 'noinline' keyword in programming?

The keyword noinline is used in some programming languages (e.g., Kotlin) to prevent the compiler from inlining a specific function.

Purpose:

• Inlining is replacing a function call with the body of the function to improve performance.
• Sometimes inlining is undesirable, for example, for functions with large bodies, to simplify debugging, or when it is necessary to preserve call semantics.

Usage features:

• Marking a function as noinline tells the compiler not to insert its code directly.
• In Kotlin, this is often used in lambdas inside inline functions to avoid inlining certain parameters.

Example in Kotlin:

inline fun doSomething(inlinedLambda: () -> Unit, noinline notInlinedLambda: () -> Unit) {
    inlinedLambda()       // will be inlined
    notInlinedLambda()    // call remains as is
}