sealed abstract class Defer[A] extends Eval[A]
Defer is a type of Eval[A] that is used to defer computations which produce Eval[A].
Users should not instantiate Defer instances themselves. Instead, they will be automatically created when needed.
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- Eval.scala
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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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- 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.
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- Eval
- def memoize: Eval[A]
Ensure that the result of the computation (if any) will be memoized.
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- val thunk: () => Eval[A]
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- def value: A
Evaluate the computation and return an A value.
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