Type.Strict

Type constraints and patterns for strict types.

Documentation

type family Strict (d :: *) :: Constraint where ...

A closed predicate that is satisfied only by strict types.

A type T is strict if

∀x :: T . rnf x = ⊥ <=> rwhnf x = ⊥

Requires undecidable instances. Mutually recursive groups of types not yet supported.

Equations

Strict Char = ()

Strict Double = ()

Strict Int = ()

Strict Integer = ()

Strict Word = ()

Strict ByteString = ()

Strict Text = ()

Strict String = ()

Strict (UArray ix v) = ()

Strict (StorableArray ix v) = ()

Strict (Map k v) = (Strict k, Strict v)

Strict (HashMap k v) = (Strict k, Strict v)

Strict (Set k) = Strict k

Strict (HashSet k) = Strict k

Strict (Vector a) = ()

Strict (MVector s a) = ()

Strict (Vector a) = ()

Strict (MVector s a) = ()

Strict (Vector a) = ()

Strict (MVector s a) = ()

Strict d = StrictRep d (Rep d)

pattern IsStrict :: forall a. Strict a => a -> a

A pattern that matches strict types