License | BSD-style (see the LICENSE file in the distribution) |
---|---|
Maintainer | libraries@haskell.org |
Stability | experimental |
Portability | portable |
Safe Haskell | Trustworthy |
Language | Haskell2010 |
Data.Proxy
Description
Definition of a Proxy type (poly-kinded in GHC)
Since: 4.7.0.0
Documentation
A concrete, poly-kinded proxy type
Constructors
Proxy |
Instances
Monad (Proxy *) | |
Functor (Proxy *) | |
Applicative (Proxy *) | |
Foldable (Proxy *) | |
Traversable (Proxy *) | |
Bounded (Proxy k s) | |
Enum (Proxy k s) | |
Eq (Proxy k s) | |
Data t => Data (Proxy * t) | |
Ord (Proxy k s) | |
Read (Proxy k s) | |
Show (Proxy k s) | |
Ix (Proxy k s) | |
Generic (Proxy * t) | |
Monoid (Proxy * s) | |
Typeable (k -> *) (Proxy k) | |
type Rep (Proxy k t) = D1 D1Proxy (C1 C1_0Proxy U1) |
asProxyTypeOf :: a -> Proxy a -> a Source
asProxyTypeOf
is a type-restricted version of const
.
It is usually used as an infix operator, and its typing forces its first
argument (which is usually overloaded) to have the same type as the tag
of the second.