UniqueHasher Class Reference

#include <hash.h>

Detailed Description

UniqueHasher allows to compute a 128-bit UniqueHash from a sequence of values. The values are passed to the hasher using a series of calls to Combine() functions. At the end, the Finalize() function returns the final hash value.

Computing the hash value through a series of calls is slower than a one-shot computation of a single byte block using UniqueHash::GetUniqueHashCode(). For better performance, you should prefer the one-shot computation if possible.

Public Types
using	ValueType = UniqueHash

Public Member Functions
	UniqueHasher ()
void	Combine (const Block< const Byte > &bytes)
void	Combine (const Byte *ptr, Int count)
void	Combine (const UniqueHash &value)
template<typename HASH = DefaultCompare, typename... ARGS>
void	HashAndCombine (const ARGS &... values)
UniqueHash	Finalize () const
	operator UniqueHash () const

Static Public Member Functions
template<typename... H>
static UniqueHash	CombineHashes (const H &... hashes)

Private Member Functions
template<typename HASH , typename T >
void	HashAndCombineImpl (const T &value)

Private Attributes
UInt64	_state [72]

Member Typedef Documentation

ValueType

using ValueType = UniqueHash

Member Function Documentation

HashAndCombine()

void HashAndCombine

(

const ARGS &...

values

)

Mixes hashes of the given values into the hasher state. If a value's type is trivially hashable, its raw bytes are used for mixing. Otherwise the hash value returned by {HASH::GetUniqueHashCode(value)} is used.

Parameters

[in]

values

Values whose hashes shall be combined into this hasher's state.

CombineHashes()

static UniqueHash CombineHashes ( const H &...  hashes )

static

Computes a UniqueHash from a sequence of hash values.

Parameters

[in]

hashes

A sequence of hash values.

Returns

A single hash value for the sequence of hash values.

HashAndCombineImpl()

void HashAndCombineImpl ( const T &  value )

private

Member Data Documentation

_state

UInt64 _state[72]

private