storable-enum: Wrapper that makes any Enum type Storable

In foreign function interfaces you will often want to use enumeration types but defining Storable instances is cumbersome. This package provides the type Enum.Storable.T w e, where e.g. Enum.Storable.T Word8 Ordering means that values of type Ordering are stored in a Word8. The Storable methods store the numeric values of the enumeration elements as obtained by fromEnum. E.g. EQ is stored as 1. The type itself stores a Haskell enumeration element, such that GHC can apply all of its optimizations for enumerations. It is not checked, whether the storage type w is large enough to hold all admissible numeric values of e. It is also not checked, whether the storage type w supports negative values whenever the enumeration of e contains ones.

See the bool8 package for the special case of a Bool stored in a Word8.

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• HenningThielemann

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