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.
Changes
Version 1.2.7.0
Add Hashable and Hashable1 instances for Complex
Fix undefined behavior in hashable_fn_hash() implementation
due to signed integer overflow (#152)
Mark Data.Hashable.Lifted as Trustworthy (re SafeHaskell)
Support GHC 8.4
Version 1.2.6.1
Use typeRepFingerprint from Type.Reflection.Unsafe
Revert instances to their 1.1 implementations to regain the
performance we had then.
Remove use of random salt altogether. Without using SipHash the
benefit is unclear (i.e. collision attacks still work) and the
complexity is no longer worth it.
Documentation improvements.
Version 1.2.0.10
Fix for GHC 7.0.
Version 1.2.0.9
Stop using SipHash. The current implementation still has segfault
causing bugs that we won’t be able to fix soon.
Stop using Wang hash. It degrades performance of fixed-size integer
hashing too much.
Version 1.2.0.8
Fix linking issue when SSE was disabled.
Hash small signed Integers correctly.
Version 1.2.0.7
Add flags to control usage of SSE.
Version 1.2.0.6
Fix another segfault caused by SSE2 code.
Version 1.2.0.5
More portability fixes.
Force stack alignment to 16 bytes everywhere. Fixes a segfault.
Fix bug where code relied on rewrite rules firing for correctness.
Version1.2.0.4
Update docs to match code.
Work around bug in GHCi runtime linker, which never call static
initializers.
Version1.2.0.3
Make building of SSE 4.1 code conditional, as it doesn’t work on all
platforms.
Use a fixed salt, but allow random salting. Random salting by
default broke people’s code.
Version1.2.0.2
Work around ghci linker bug on Windows.
Version1.2.0.1
Fix performance bug in SSE implementation of SipHash.
Fix segfault due to incorrect stack alignment on Windows.
Version1.2.0.0
Switch string hashing from FNV-1 to SipHash, in an effort to
prevent collision attacks.
Switch fixed-size integer hashing to Wang hash.
The default salt now switched on every program run, in an effort to
prevent collision attacks.
Move hash method out of Hashable type class.
Add support for generic instance deriving.
Add instance for Ordering.
Version1.1.2.5
Bug fix for bytestring < 0.10.0.
Version1.1.2.4
Switch string hashing from Bernstein to FNV-1
Faster instance for Integer.
Update dependency on base, ghc-prim
Now works with GHC 7.6.
Version1.1.2.3
Add instance for TypeRep.
Update dependency on test-framework.
Version1.1.2.2
Bug fix for GHC 7.4
Version1.1.2.1
Update dependency on test-framework.
Improve documentation of combine.
Version1.1.2.0
Add instances for Interger, Ratio, Float, Double, and StableName.
Fix hash collision issues for lists and tuples when using a
user-specified salt.
Version1.1.1.0
Improved instances for tuples and lists.
Add instances for StableName, Float, Double, Integer, and Ratio.
Version1.1.1.0
Add hashWithSalt, which allows the user to create different hash
values for the same input by providing different seeds. This is
useful for application like Cuckoo hashing which need a family of
hash functions.
Fix a bug in the Hashable instance for Int64/Word64 on 32-bit
platforms.
Improved resilience to leading zero in the input being hashed.
Version1.1.0.0
Add instance for: strict and lazy Texts, ThreadId
Add hashPtrWithSalt and hashByteArrayWithSalt.
Faster ByteArray# hashing.
Fix a signedness bug that affected ByteString.
Fix ByteString hashing to work correctly on both 32 and 64-bit
platforms.
Version1.0.1.1
Fix bug in Hashable instance for lazy ByteStrings where differences
in the internal structure of the ByteString could cause different
hash values for ByteStrings that are equal according to ==.
Version1.0.1.0
Add two helpers for creating Hashable instances: hashPtr and
hashByteArray.
Version1.0.0
Separate Hashable class to its own package from hashmap 1.0.0.3.
