signet::forge::xxhash Namespace Reference

xxHash64 hashing functions for Parquet bloom filter support. More...

Namespaces
namespace	detail
	Implementation details – not part of the public API.

Functions
uint64_t	hash64 (const void *data, size_t length, uint64_t seed=0)
	Compute xxHash64 of an arbitrary byte buffer.
uint64_t	hash64 (const std::string &s, uint64_t seed=0)
	Convenience overload: hash a std::string.
template<typename T >
uint64_t	hash64_value (const T &val, uint64_t seed=0)
	Convenience overload: hash a trivially-copyable typed value.

Detailed Description

xxHash64 hashing functions for Parquet bloom filter support.

Function Documentation

hash64() [1/2]

uint64_t signet::forge::xxhash::hash64 ( const std::string &  s, uint64_t  seed = 0  )

inline

Convenience overload: hash a std::string.

Parameters

s	The string to hash.
seed	Hash seed (default 0).

Returns

64-bit hash value.

Definition at line 249 of file xxhash.hpp.

hash64() [2/2]

uint64_t signet::forge::xxhash::hash64 ( const void *  data, size_t  length, uint64_t  seed = 0  )

inline

Compute xxHash64 of an arbitrary byte buffer.

This is the primary entry point. For inputs >= 32 bytes, four parallel accumulators are used (Steps 1-3); for smaller inputs, a single accumulator seeded with PRIME5 is used. All remaining bytes are consumed in 8-byte, 4-byte, and 1-byte chunks before a final avalanche mix.

Parameters

data	Pointer to input data (may be nullptr if length == 0).
length	Number of bytes to hash.
seed	Hash seed (default 0). Different seeds produce independent hashes.

Returns

64-bit hash value.

Definition at line 159 of file xxhash.hpp.

hash64_value()

template<typename T >

uint64_t signet::forge::xxhash::hash64_value ( const T &  val, uint64_t  seed = 0  )

inline

Convenience overload: hash a trivially-copyable typed value.

Hashes sizeof(T) bytes of the value's object representation. This is suitable for primitive types (int32_t, int64_t, float, double, etc.).

Template Parameters

T	A trivially-copyable type (enforced via static_assert).

Parameters

val	The value to hash.
seed	Hash seed (default 0).

Returns

64-bit hash value.

Definition at line 263 of file xxhash.hpp.