Portability | non-portable (GHC Extensions) |
---|---|
Stability | experimental |
Maintainer | Tom Hvitved <hvitved@diku.dk> |
This module provides operators on difunctors.
Documentation
Formal sum of signatures (difunctors).
f :<: g => f :<: (:+: h g) | |
f :<: (:+: f g) | |
(Difunctor f, Difunctor g) => Difunctor (:+: f g) | |
(Ditraversable f, Ditraversable g) => Ditraversable (:+: f g) | |
(EqD f, EqD g) => EqD (:+: f g) |
|
(OrdD f, OrdD g) => OrdD (:+: f g) |
|
(ShowD f, ShowD g) => ShowD (:+: f g) | |
(Desugar f g0, Desugar g g0) => Desugar (:+: f g) g0 | |
DistAnn s p s' => DistAnn (:+: f s) p (:+: (:&: f p) s') | |
RemA s s' => RemA (:+: (:&: f p) s) (:+: f s') | |
(Eq (f a b), Eq (g a b)) => Eq (:+: f g a b) | |
(Ord (f a b), Ord (g a b)) => Ord (:+: f g a b) | |
(Show (f a b), Show (g a b)) => Show (:+: f g a b) |
Signature containment relation for automatic injections. The left-hand must
be an atomic signature, where as the right-hand side must have a list-like
structure. Examples include f :<: f :+: g
and g :<: f :+: (g :+: h)
,
non-examples include f :+: g :<: f :+: (g :+: h)
and
f :<: (f :+: g) :+: h
.
This data type adds a constant product to a signature.
(f a b) :&: p |