vita::hash_t Struct Reference

A 128bit unsigned integer used as individual's signature / hash table look-up key. More...

#include <cache_hash.h>

Public Member Functions
void	clear ()
	Resets the content of the object. More...
void	combine (hash_t h)
	Used to combine multiple hashes. More...
bool	empty () const
	We assume that a string of 128 zero bits means empty. More...
	hash_t (std::uint64_t a=0, std::uint64_t b=0)
bool	load (std::istream &)
bool	operator!= (hash_t h) const
	Standard inequality operator for hash signature. More...
bool	operator== (hash_t h) const
	Standard equality operator for hash signature. More...
bool	save (std::ostream &) const

Public Attributes
std::uint_least64_t	data [2]

Detailed Description

A 128bit unsigned integer used as individual's signature / hash table look-up key.

Definition at line 26 of file cache_hash.h.

Constructor & Destructor Documentation

hash_t()

vita::hash_t::hash_t ( std::uint64_t  a = 0, std::uint64_t  b = 0  )

inlineexplicit

Definition at line 28 of file cache_hash.h.

Member Function Documentation

clear()

void vita::hash_t::clear ( )

inline

Resets the content of the object.

Definition at line 31 of file cache_hash.h.

combine()

void vita::hash_t::combine ( hash_t  h )

inline

Used to combine multiple hashes.

Note

In spite of its handy bit-mixing properties, XOR is not a good way to combine hashes due to its commutativity (e.g. see http://stackoverflow.com/q/5889238/3235496).

Definition at line 47 of file cache_hash.h.

empty()

bool vita::hash_t::empty ( ) const

inline

We assume that a string of 128 zero bits means empty.

Definition at line 61 of file cache_hash.h.

load()

bool vita::hash_t::load

(

std::istream &

in

)

Parameters

[in]

in

input stream

Returns

true if hash_t loaded correctly

Note

If the load operation isn't successful the current hash_t isn't changed.

Definition at line 26 of file cache_hash.cc.

operator!=()

bool vita::hash_t::operator!= ( hash_t  h ) const

inline

Standard inequality operator for hash signature.

Definition at line 38 of file cache_hash.h.

operator==()

bool vita::hash_t::operator== ( hash_t  h ) const

inline

Standard equality operator for hash signature.

Definition at line 34 of file cache_hash.h.

save()

bool vita::hash_t::save

(

std::ostream &

out

)

const

Parameters

[out]

out

output stream

Returns

true if hash_t was saved correctly

Definition at line 42 of file cache_hash.cc.

Member Data Documentation

data

std::uint_least64_t vita::hash_t::data[2]

Definition at line 68 of file cache_hash.h.

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The documentation for this struct was generated from the following files:

• cache_hash.h
• cache_hash.cc