scala.noinline
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.
Examples:
@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
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