Packages

  • package root
    Definition Classes
    root
  • package org
    Definition Classes
    root
  • package specs2
    Definition Classes
    org
  • package control
    Definition Classes
    specs2
  • package eff
    Definition Classes
    control
  • trait Interpret extends AnyRef

    Support methods to create interpreters (or "effect handlers") for a given effect M and a value Eff[R, A] when M is a member of R.

    Support methods to create interpreters (or "effect handlers") for a given effect M and a value Eff[R, A] when M is a member of R.

    Those methods guarantee a stack-safe behaviour when running on a large list of effects (in list.traverse(f) for example).

    There are different types of supported interpreters:

    1. "interpret" + Recurse

    This interpreter is used to handle effects which either return a value X from M[X] or stops with Eff[R, B] See an example of such an interpreter in Eval where we just evaluate a computation X for each Eval[X].

    2. "interpretState" + StateRecurse

    This interpreter is used to handle effects which either return a value X from M[X] or stops with Eff[R, B]

    3. "interpretLoop" + Loop

    The most generic kind of interpreter where we can even recurse in the case of Pure(a) (See ListEffect for such a use)

    4. "intercept / interceptState / interceptLoop" methods are similar but they transform an effect to other effects in the same stack without removing it from the stack

    5. "transform" to swap an effect T of a stack to another effect, using a Natural Transformation

    6. "translate" to interpret one effect of a stack into other effects of the same stack using a Natural Transformation this is a specialized version of interpret + Recurse

    7. "interpretUnsafe + SideEffect" when you have a side effecting function M[X] => X

    Definition Classes
    eff
  • StateRecurse

trait StateRecurse[M[_], A, B] extends AnyRef

Helper trait for computations which might produce several M[X] in a stack of effects and which need to keep some state around

This is typically the case for Writer or State which need to keep some state S after each evaluation Evaluating the effect M[X] might use the previous S value as shown in the apply method

Finally when the Eff[R, A] returns an A, this one can be combined with the last state value to produce a B

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Type Members

  1. abstract type S

Abstract Value Members

  1. abstract def applicative[X, T[_]](xs: T[M[X]], s: S)(implicit arg0: Traverse[T]): Either[(T[X], S), (M[T[X]], S)]
  2. abstract def apply[X](x: M[X], s: S): (X, S)
  3. abstract def finalize(a: A, s: S): B
  4. abstract val init: S

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  18. final def wait(arg0: Long, arg1: Int): Unit
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  19. final def wait(arg0: Long): Unit
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