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Some more stuff for Cont #374

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Merged
larsrh merged 2 commits into from
May 22, 2013
Merged

Some more stuff for Cont #374

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cdbc6fe
Implement `xhoist`
pthariensflame May 20, 2013
70a6989
Add `contracohoist`
pthariensflame May 20, 2013
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12 changes: 10 additions & 2 deletions core/src/main/scala/scalaz/IndexedContsT.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,15 @@ object IndexedContsT extends IndexedContsTFunctions with IndexedContsTInstances
trait IndexedContsTFunctions {
def point[W[+_], M[+_], R, A](a: => A)(implicit W: Comonad[W]): ContsT[W, M, R, A] = ContsT { k => W.copoint(k)(a) }

def liftM[W[+_], M[+_], R, O, A](a: => M[A])(implicit W: Comonad[W], M: Bind[M]): ContsT[W, M, R, A] = ContsT { k => M.bind(a)(W.copoint(k)) }
def liftM[W[+_], M[+_], R, A](a: => M[A])(implicit W: Comonad[W], M: Bind[M]): ContsT[W, M, R, A] = ContsT { k => M.bind(a)(W.copoint(k)) }

def xhoist[W[+_], M[+_], N[+_], R, O](f: M ~> N, g: N ~> M)(implicit W: Functor[W]): (({type f[+x]=IndexedContsT[W, M, R, O, x]})#f ~> ({type f[+x]=IndexedContsT[W, N, R, O, x]})#f) = new (({type f[+x]=IndexedContsT[W, M, R, O, x]})#f ~> ({type f[+x]=IndexedContsT[W, N, R, O, x]})#f) {
def apply[A](fa: IndexedContsT[W, M, R, O, A]): IndexedContsT[W, N, R, O, A] = IndexedContsT { wk => f(fa.run(W.map(wk) { k => { x => g(k(x)) } })) }
}

def contracohoist[W[+_], V[+_], M[+_], R, O](f: V ~> W): (({type f[+x]=IndexedContsT[W, M, R, O, x]})#f ~> ({type f[+x]=IndexedContsT[V, M, R, O, x]})#f) = new (({type f[+x]=IndexedContsT[W, M, R, O, x]})#f ~> ({type f[+x]=IndexedContsT[V, M, R, O, x]})#f) {
def apply[A](fa: IndexedContsT[W, M, R, O, A]): IndexedContsT[V, M, R, O, A] = IndexedContsT { k => fa.run(f(k)) }
}

def shift[W[+_], M[+_], I, R, J, O, A](f: (A => IndexedContsT[W, M, I, I, O]) => IndexedContsT[W, M, R, J, J])(implicit W: Comonad[W], WA: Applicative[W], M: Monad[M]): IndexedContsT[W, M, R, O, A] =
IndexedContsT { k0 =>
Expand All @@ -70,7 +78,7 @@ trait IndexedContsTFunctions {
def callCC[W[+_], M[+_], R, O, A](f: (A => IndexedContsT[W, M, Any, O, Nothing]) => IndexedContsT[W, M, R, O, A])(implicit W: Comonad[W]): IndexedContsT[W, M, R, O, A] =
IndexedContsT { k =>
(f { a =>
IndexedContsT { u =>
IndexedContsT { _ =>
W.copoint(k)(a)
}
}).run(k)
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