final class Always[A] extends Leaf[A]
Construct a lazy Eval[A] instance.
This type can be used for "lazy" values. In some sense it is equivalent to using a Function0 value.
This type will evaluate the computation every time the value is required. It should be avoided except when laziness is required and caching must be avoided. Generally, prefer Later.
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- Eval.scala
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- new Always(f: () => A)
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- def flatMap[B](f: (A) => Eval[B]): Eval[B]
Lazily perform a computation based on an Eval[A], using the function
f
to produce an Eval[B] given an A.Lazily perform a computation based on an Eval[A], using the function
f
to produce an Eval[B] given an A.This call is stack-safe -- many .flatMap calls may be chained without consumed additional stack during evaluation. It is also written to avoid left-association problems, so that repeated calls to .flatMap will be efficiently applied.
Computation performed in f is always lazy, even when called on an eager (Now) instance.
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- Eval
- final def getClass(): Class[_ <: AnyRef]
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- def map[B](f: (A) => B): Eval[B]
Transform an Eval[A] into an Eval[B] given the transformation function
f
.Transform an Eval[A] into an Eval[B] given the transformation function
f
.This call is stack-safe -- many .map calls may be chained without consumed additional stack during evaluation.
Computation performed in f is always lazy, even when called on an eager (Now) instance.
- Definition Classes
- Eval
- def memoize: Eval[A]
Ensure that the result of the computation (if any) will be memoized.
- final def ne(arg0: AnyRef): Boolean
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- def value: A
Evaluate the computation and return an A value.
- final def wait(): Unit
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- final def wait(arg0: Long, arg1: Int): Unit
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