final class noinline extends StaticAnnotation

An annotation for methods that the optimizer should not inline.

Note that by default, the Scala optimizer is disabled and no callsites are inlined. See -opt:help for information how to enable the optimizer and inliner.

When inlining is enabled, the inliner will never inline methods or callsites annotated @noinline.


@inline final def f1(x: Int) = x @noinline final def f2(x: Int) = x final def f3(x: Int) = x def t1 = f1(1) // inlined if possible def t2 = f2(1) // not inlined def t3 = f3(1) // may be inlined (the inliner heuristics can select the callsite) def t4 = f1(1): @noinline // not inlined (override at callsite) def t5 = f2(1): @inline // inlined if possible (override at callsite) def t6 = f3(1): @inline // inlined if possible def t7 = f3(1): @noinline // not inlined }

Note: parentheses are required when annotating a callsite within a larger expression.

def t1 = f1(1) + f1(1): @noinline // equivalent to (f1(1) + f1(1)): @noinline def t2 = f1(1) + (f1(1): @noinline) // the second call to f1 is not inlined
class Object
trait Matchable
class Any