Safe Haskell | None |
---|---|

Language | Haskell2010 |

Copyright (c)2011, Reiner Pope

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

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- Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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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 for`ConcreteTypeRep`

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`

b`a`

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`