scala.util.control.TailCalls
Methods exported by this object implement tail calls via trampolining.
Tail calling methods must either return their result using done or call the next method using tailcall. Both return an instance of TailRec. The result of evaluating a tailcalling function can be retrieved from a TailRec value using method result.
Implemented as described in "Stackless Scala with Free Monads" https://blog.higher-order.com/assets/trampolines.pdf
Here's a usage example:
import scala.util.control.TailCalls._
def isEven(xs: List[Int]): TailRec[Boolean] =
if (xs.isEmpty) done(true) else tailcall(isOdd(xs.tail))
def isOdd(xs: List[Int]): TailRec[Boolean] =
if (xs.isEmpty) done(false) else tailcall(isEven(xs.tail))
isEven((1 to 100000).toList).result
def fib(n: Int): TailRec[Int] =
if (n < 2) done(n) else for {
x <- tailcall(fib(n - 1))
y <- tailcall(fib(n - 2))
} yield x + y
fib(40).result
This class represents a tailcalling computation.
This class represents a tailcalling computation.
AttributesReturn the final result from a tailcalling computation.
Return the final result from a tailcalling computation.
Value parametersthe result value
a TailRec object representing a computation which immediately returns result
Perform a tailcall.
Perform a tailcall.
Value parametersthe expression to be evaluated in the tailcall
a TailRec object representing the expression rest
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