Safe Haskell | None |
---|---|
Language | Haskell2010 |
Copyright (c)2011, Reiner Pope
All rights reserved.
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This module defines Binary
and Hashable
instances for TypeRep
. These are defined on a newtype of TypeRep
, namely ConcreteTypeRep
, for two purposes:
- to avoid making orphan instances
- the
Hashable
instance forConcreteTypeRep
may not be pure enough for some people's tastes.
As usual with Typeable
, this module will typically be used with some variant of Data.Dynamic
. Two possible uses of this module are:
- making hashmaps:
HashMap
ConcreteTypeRep
Dynamic - serializing
Dynamic
s.
- data ConcreteTypeRep
- cTypeOf :: Typeable a => a -> ConcreteTypeRep
- toTypeRep :: ConcreteTypeRep -> TypeRep
- fromTypeRep :: TypeRep -> ConcreteTypeRep
Documentation
data ConcreteTypeRep Source #
Abstract type providing the functionality of TypeRep
, but additionally supporting hashing and serialization.
The Eq
instance is just the Eq
instance for TypeRep
, so an analogous guarantee holds:
if and only if cTypeOf
a == cTypeOf
ba
and b
have the same type.
The hashing and serialization functions preserve this equality.
Eq ConcreteTypeRep Source # | |
Show ConcreteTypeRep Source # | |
Binary ConcreteTypeRep Source # | |
Hashable ConcreteTypeRep Source # | This instance is guaranteed to be consistent for a single run of the program, but not for multiple runs. |
fromTypeRep :: TypeRep -> ConcreteTypeRep Source #
Converts from the underlying TypeRep