dynamic-state-0.3.1: Optionally serializable dynamic state keyed by type

Data.ConcreteTypeRep

Description

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

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• 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.
• Neither the name of Reiner Pope nor the names of other contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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 Dynamics.

Synopsis

# Documentation

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: cTypeOf a == cTypeOf b if and only if a and b have the same type. The hashing and serialization functions preserve this equality.

Instances

 Source # Methods Source # MethodsshowList :: [ConcreteTypeRep] -> ShowS # Source # MethodsputList :: [ConcreteTypeRep] -> Put # Source # This instance is guaranteed to be consistent for a single run of the program, but not for multiple runs. Methods

cTypeOf :: Typeable a => a -> ConcreteTypeRep Source #

"Concrete" version of typeOf.

Converts to the underlying TypeRep

Converts from the underlying TypeRep