This package defines a class, Hashable, for types that can be converted to a hash value. This class exists for the benefit of hashing-based data structures. The package provides instances for basic types and a way to combine hash values.

Hashable is intended exclusively for use in in-memory data structures.

Hashable does not have a fixed standard. This allows it to improve over time.

Because it does not have a fixed standard, different computers or computers on different versions of the code will observe different hash values. As such, hashable is not recommended for use other than in-memory datastructures. Specifically, hashable is not intended for network use or in applications which persist hashed values. For stable hashing use named hashes: sha256, crc32, xxhash etc.

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Flags

Manual Flags

Name	Description	Default
arch-native	Use -march=native when compiling C sources. Portable implementation is 15-50% slower. Consider enabling this flag if hashing performance is important.	Disabled
random-initial-seed	Randomly initialize the initial seed on each final executable invocation This is useful for catching cases when you rely on (non-existent) stability of hashable's hash functions. This is not a security feature.	Disabled

Automatic Flags

Name	Description	Default
integer-gmp	Are we using integer-gmp to provide fast Integer instances? No effect on GHC-9.0 or later.	Enabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

Downloads

• hashable-1.4.7.0.tar.gz [browse] (Cabal source package)
• Package description (as included in the package)

Maintainer's Corner

Package maintainers

• BryanOSullivan, HerbertValerioRiedel, JohanTibell, MilanStraka, phadej

For package maintainers and hackage trustees

• edit package information

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