What is inline function

However, if you do it in a reasonable way avoiding inlining large functions , it will pay off in performance, especially at "megamorphic" call-sites inside loops. Inlinable lambdas can only be called inside inline functions or passed as inlinable arguments.

In Kotlin, you can only use a normal, unqualified return to exit a named function or an anonymous function. To exit a lambda, use a label. A bare return is forbidden inside a lambda because a lambda cannot make the enclosing function return :. But if the function the lambda is passed to is inlined, the return can be inlined, as well. So it is allowed:. Such returns located in a lambda, but exiting the enclosing function are called non-local returns.

This sort of construct usually occurs in loops, which inline functions often enclose:. Note that some inline functions may call the lambdas passed to them as parameters not directly from the function body, but from another execution context, such as a local object or a nested function. In such cases, non-local control flow is also not allowed in the lambdas. To indicate that the lambda parameter of the inline function cannot use non-local returns, mark the lambda parameter with the crossinline modifier:.

Here, you walk up a tree and use reflection to check whether a node has a certain type. A better solution would be to simply pass a type to this function. Here, the inline function add int a, int b has been defined before the main function and later been called inside the main function. When the add function is called, the code of the add function definition is placed there, i. Henceforth, it saves from the overhead of function calls and returns.

The working of the inline function add a,b has been illustrated below:. However, an inline function can be defined inside a class as well. At the time of compilation, this inline function max a,b in the above example works in the same way as the inline function add a,b in the previous example. To learn more about programming and other related concepts, check out the courses on Great Learning Academy. Remember Me!

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