gum::HashFunc< Debug > Class Reference

Hash function for gum::Debug. More...

#include <agrum/base/core/hashFunc.h>

Inheritance diagram for gum::HashFunc< Debug >:

Collaboration diagram for gum::HashFunc< Debug >:

Public Member Functions
virtual Size	operator() (const Debug &key) const override final
	Computes the hashed value of a key.
void	resize (const Size new_size)
	Update the hash function to take into account a resize of the hash table.
Size	size () const
	Returns the hash table size as known by the hash function.

Static Public Member Functions
static Size	castToSize (const Debug &key)
	Returns the value of a key as a Size.

Protected Attributes
Size	hash_size_
	The size of the hash table.
unsigned int	hash_log2_size_
	Log of the number of slots of the hash table in base 2.
Size	hash_mask_
	performing y = x & hash_mask_ guarantees that y is a slot index of the hash table
unsigned int	right_shift_
	performing y = x >> right_shift_ guarantees that y is a slot index of the hash table

Friends
template<typename OTHER_KEY>
class	HashFunc

Detailed Description

Hash function for gum::Debug.

Definition at line 645 of file hashFunc.h.

Member Function Documentation

castToSize()

Size gum::HashFunc< Debug >::castToSize ( const Debug & key )

static

Returns the value of a key as a Size.

Parameters

key	The value to return as a Size.

Returns

Returns the value of a key as a Size.

operator()()

virtual Size gum::HashFunc< Debug >::operator() ( const Debug & key ) const

finaloverridevirtual

Computes the hashed value of a key.

Parameters

key	The key to compute the hashed value.

Returns

Returns the hashed value of a key.

Implements gum::HashFuncBase< Debug >.

resize()

void gum::HashFuncBase< Debug >::resize ( const Size new_size )

inherited

Update the hash function to take into account a resize of the hash table.

When the user wishes to resize the gum::HashTable so that the array is of size s, the gum::HashTable resizes itself to the smallest power of 2 greater than or equal to s. This new size is computed by function gum::HashFuncBase::resize(gum::Size). Hence, s should be the size of the array of lists, not the number of elements stored into the gum::HashTable.

Parameters

new_size

The hashtable's size wished by the user. Actually, a hashtable of size n is an array of n lists.

Exceptions

SizeError

Raised if s is too small.

size()

Size gum::HashFuncBase< Debug >::size ( ) const

inherited

Returns the hash table size as known by the hash function.

Returns

Returns the size of the hash table, i.e., the number of slots (lists) it contains.

Friends And Related Symbol Documentation

HashFunc

template<typename OTHER_KEY>

friend class HashFunc

friend

Definition at line 662 of file hashFunc.h.

References HashFunc.

Referenced by HashFunc.

Member Data Documentation

hash_log2_size_

unsigned int gum::HashFuncBase< Debug >::hash_log2_size_

protectedinherited

Log of the number of slots of the hash table in base 2.

Definition at line 224 of file hashFunc.h.

{0};

hash_mask_

Size gum::HashFuncBase< Debug >::hash_mask_

protectedinherited

performing y = x & hash_mask_ guarantees that y is a slot index of the hash table

To transform a Size x into a slot index of the hash table, you can either use x & hash_mask_ or x >> right_shift_ depending on whether you want to exploit the least significant bits of x (&) or the most significant one (>>).

Definition at line 235 of file hashFunc.h.

{Size(0)};

hash_size_

Size gum::HashFuncBase< Debug >::hash_size_

protectedinherited

The size of the hash table.

Definition at line 221 of file hashFunc.h.

{Size(0)};

right_shift_

unsigned int gum::HashFuncBase< Debug >::right_shift_

protectedinherited

performing y = x >> right_shift_ guarantees that y is a slot index of the hash table

To transform a Size x into a slot index of the hash table, you can either use x & hash_mask_ or x >> right_shift_ depending on whether you want to exploit the least significant bits of x (&) or the most significant one (>>).

Definition at line 246 of file hashFunc.h.

{0};

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The documentation for this class was generated from the following file:

• agrum/base/core/hashFunc.h