Difference between revisions of "Zygohistomorphic prepromorphisms"

From HaskellWiki
Jump to: navigation, search
Line 2: Line 2:
   
 
<pre>
 
<pre>
  +
zygohistomorphic_prepromorphism :: Algebra f b -> GAlgebra f (Cofree f) a -> (f :~> f) -> FixF f -> a
 
zygohistomorphic_prepromorphism f = g_prepro (distZygoT (liftAlgebra f) (distHisto id)) -- unless you want a generalized zygomorphism.
 
zygohistomorphic_prepromorphism f = g_prepro (distZygoT (liftAlgebra f) (distHisto id)) -- unless you want a generalized zygomorphism.
 
</pre>
 
</pre>

Revision as of 01:36, 9 June 2008

Used when you really need both semi-mutual recursion and history and to repeatedly apply a natural transformation as you get deeper into the functor.

zygohistomorphic_prepromorphism :: Algebra f b -> GAlgebra f (Cofree f) a -> (f :~> f) -> FixF f -> a
zygohistomorphic_prepromorphism f = g_prepro (distZygoT (liftAlgebra f) (distHisto id)) -- unless you want a generalized zygomorphism.