Chained hashing collection. More...

#include <Hashtable.h>

Inheritance diagram for utl::Hashtable:

[legend]

Public Member Functions
	Hashtable (size_t size, uint_t maxLF=90, bool owner=true, bool multiSet=false, const HashFunction *hfunc=nullptr)
	Constructor. More...

	Hashtable (bool owner, bool multiSet=false, const HashFunction *hfunc=nullptr)
	Constructor. More...

virtual void	steal (Object &rhs)
	"Steal" the internal representation from another instance. More...

virtual void	vclone (const Object &rhs)
	Make an exact copy of another instance. More...

virtual size_t	innerAllocatedSize () const
	Get the "inner" allocated size. More...

Misc. Modification
void	setHashFunction (const HashFunction *hashfn)
	Set the hash function. More...

void	reserve (size_t newSize)
	Grow the hash-table to a size large enough to contain the given number of objects. More...

Searching
virtual Object *	find (const Object &key) const
	Find an object matching a given key. More...

iterator	findIt (const Object &key) const

iterator	findIt (const Object &key)

void	findIt (const Object &key, BidIt &it) const

virtual void	findIt (const Object &key, BidIt &it)
	Find an object matching a given key. More...

Adding Objects
bool	add (const Object &object)

virtual bool	add (const Object *object)
	Add an object to the collection. More...

void	add (const Collection &collection)

Object *	addOrFind (const Object &object)

virtual Object *	addOrFind (const Object *object)
	Add the given object, or find a matching object already contained. More...

bool	addOrUpdate (const Object &object)

virtual bool	addOrUpdate (const Object *object)
	Add or update the given object. More...

Removing Objects
virtual void	clear ()
	Clear the collection by removing all objects. More...

void	excise ()
	Same as clear(), but in addition the pointer array is deleted. More...

bool	remove (const Object *key)

virtual bool	remove (const Object &key)
	Remove the object matching the given key. More...

virtual void	removeIt (BidIt &it)
	Remove the object the given iterator points to. More...

Iterators
iterator	begin () const

iterator	begin ()

virtual BidIt *	beginNew () const
	Return a const iterator pointing to the beginning of the collection. More...

virtual BidIt *	beginNew ()
	Return an iterator pointing to the beginning of the collection. More...

iterator	end () const

iterator	end ()

virtual BidIt *	endNew () const
	Return a const iterator pointing to the end of the collection. More...

virtual BidIt *	endNew ()
	Return an iterator pointing to the end of the collection. More...

Public Member Functions inherited from utl::Collection
void	assertOwner ()
	Assert ownership of contained objects. More...

virtual void	copy (const Object &rhs)
	Copy another instance. More...

virtual void	dump (Stream &os, uint_t level=uint_t_max) const
	Dump a human-readable representation of self to the given output stream. More...

virtual void	serialize (Stream &stream, uint_t io, uint_t mode=ser_default)
	Serialize to or from a stream. More...

void	serialize (const RunTimeClass *rtc, Stream &stream, uint_t io, uint_t mode=ser_default)
	Serialize to/from the given stream. More...

virtual bool	update (const Object *object)
	Update the given object. More...

bool	isOwner () const
	Get the owner flag. More...

void	setOwner (bool owner)
	Set the owner flag. More...

const Ordering *	ordering () const
	Get the ordering. More...

Ordering *	ordering ()
	Get the ordering. More...

void	setOrdering (const Ordering &ordering, uint_t algorithm=sort_quickSort)
	Set the ordering, and optionally sort the collection to reflect the new ordering. More...

virtual void	setOrdering (Ordering *ordering, uint_t algorithm=sort_quickSort)
	Set the ordering, and optionally sort the collection to reflect the new ordering. More...

bool	empty () const
	Determine whether the collection is empty. More...

bool	isMultiSet () const
	Get the multiSet flag. More...

void	setMultiSet (bool multiSet)
	Set the multiSet flag. More...

bool	isMarked () const
	Get marked flag. More...

void	setMarked (bool marked=true)
	Set marked flag. More...

size_t	items () const
	Get the number of contained objects. More...

size_t	size () const
	Get the number of contained objects. More...

bool	add (const Object &object)
	Add an object to the collection. More...

void	add (const Collection &collection)
	Add another collection's objects. More...

virtual BidIt *	addIt (const Object *object)
	Add an object to the collection. More...

Object *	addOrFind (const Object &object)
	Add the given object, or find a matching object already contained. More...

bool	addOrUpdate (const Object &object)
	Add or update the given object. More...

Collection &	copyItems (const Collection src, const Predicate pred=nullptr, bool predVal=true)
	Copy objects from another collection. More...

Collection &	copyItems (const ListNode src, const Predicate pred=nullptr, bool predVal=true)
	Copy objects from a double-linked list. More...

Collection &	copyItems (const SlistNode src, const Predicate pred=nullptr, bool predVal=true)
	Copy objects from a single-linked list. More...

Collection &	stealItems (Collection *src)
	"Steal" items from another collection. More...

Collection &	operator+= (const Object &rhs)
	Add an object to the collection. More...

Collection &	operator+= (const Object *rhs)
	Add an object to the collection. More...

Collection &	operator+= (const Collection &rhs)
	Add another collection's objects. More...

Collection &	operator-= (const Object &rhs)
	Remove an object from the collection. More...

void	dump (Stream &os, uint_t level, bool key, bool printClassName, uint_t indent, const char *separator) const
	Dump contained objects to a stream. More...

virtual String	toString () const
	Obtain a string representation by invoking Object::toString() on all contained objects.

String	toString (bool key) const
	Obtain a string representation by invoking Object::toString() on all contained objects (or their keys). More...

String	toString (const char *sep, bool key=false) const
	Obtain a string represenation by invoking Object::toString() on all contained objects (or their keys). More...

String	toString (const String &sep, bool key=false) const
	Obtain a string represenation of the collection by invoking Object::toString() on all contained objects (or their keys). More...

iterator	begin () const
	Return a const iterator pointing to the first object in the collection. More...

iterator	begin ()
	Return an iterator pointing to the first object in the collection. More...

virtual BidIt *	createIt () const
	Create a const iterator. More...

virtual BidIt *	createIt ()
	Create an iterator. More...

iterator	end () const
	Return a const iterator pointing to the end of the collection. More...

iterator	end ()
	Return an iterator pointing to the end of the collection. More...

bool	contains (const Object *key) const
	Determine whether the collection contains an object matching the given key. More...

bool	contains (const Object &key) const
	Determine whether the collection contains an object matching the given key. More...

size_t	count (const Predicate *pred=nullptr, bool predVal=true) const
	Count contained objects. More...

Object *	find (const Object *key) const
	Find an object matching a given key. More...

void	findIt (const Object &key, BidIt &it) const
	Find an object matching a given key. More...

Object *	first () const
	Return the first object (nullptr if empty). More...

bool	has (const Object *key) const
	See contains(). More...

bool	has (const Object &key) const
	See contains(). More...

Object *	last () const
	Get the last object (nullptr if empty). More...

bool	remove (const Object *key)
	Remove the object matching the given key. More...

Object *	take (BidIt &it)
	Remove the object the given iterator points to, but do not delete the object even if the collection owns its objects. More...

Object *	operator[] (const Object *object)
	add-or-find access operator (returns Object*). More...

Object &	operator() (const Object *object)
	add-or-find access operator (returns Object&). More...

Public Member Functions inherited from utl::Object
void	clear ()
	Revert to initial state. More...

virtual int	compare (const Object &rhs) const
	Compare with another object. More...

void	dumpWithClassName (Stream &os, uint_t indent=4, uint_t level=uint_t_max) const
	Front-end for dump() that prints the object's class name. More...

virtual const Object &	getKey () const
	Get the key for this object. More...

bool	hasKey () const
	Determine whether or not the object has a key. More...

virtual const Object &	getProxiedObject () const
	Get the proxied object (= self if none). More...

virtual Object &	getProxiedObject ()
	Get the proxied object (= self if none). More...

virtual size_t	hash (size_t size) const
	Get the hash code for the object. More...

bool	_isA (const RunTimeClass *runTimeClass) const
	Determine whether self's class is a descendent of the given class. More...

	operator String () const
	Conversion to String. More...

size_t	allocatedSize () const
	Get the total allocated size of this object. More...

virtual void	addOwnedIt (const class FwdIt *it) const
	Notify self that it owns the given iterator. More...

virtual void	removeOwnedIt (const class FwdIt *it) const
	Notify self that the given owned iterator has been destroyed. More...

bool	operator< (const Object &rhs) const
	Less-than operator. More...

bool	operator<= (const Object &rhs) const
	Less-than-or-equal-to operator. More...

bool	operator> (const Object &rhs) const
	Greater-than operator. More...

bool	operator>= (const Object &rhs) const
	Greater-than-or-equal-to operator. More...

bool	operator== (const Object &rhs) const
	Equal-to operator. More...

bool	operator!= (const Object &rhs) const
	Unequal-to operator. More...

void	serializeIn (Stream &is, uint_t mode=ser_default)
	Serialize from an input stream. More...

void	serializeOut (Stream &os, uint_t mode=ser_default) const
	Serialize to an output stream. More...

void	serializeOutBoxed (Stream &os, uint_t mode=ser_default) const
	Serialize a boxed object to an output stream. More...

Additional Inherited Members
Static Public Member Functions inherited from utl::Object
static Object *	serializeInNullable (Stream &is, uint_t mode=ser_default)
	Serialize a nullptr-able object from an input stream. More...

static void	serializeOutNullable (const Object *object, Stream &os, uint_t mode=ser_default)
	Serialize a nullptr-able object to an output stream. More...

static void	serializeNullable (Object *&object, Stream &stream, uint_t io, uint_t mode=ser_default)
	Serialize a nullptr-able object to or from a stream. More...

static Object *	serializeInBoxed (Stream &is, uint_t mode=ser_default)
	Serialize a boxed object from an input stream. More...

static void	serializeBoxed (Object *&object, Stream &stream, uint_t io, uint_t mode=ser_default)
	Serialize a boxed object to or from a stream. More...

Protected Member Functions inherited from utl::FlagsMI
	FlagsMI ()
	Constructor. More...

virtual	~FlagsMI ()
	Destructor. More...

void	copyFlags (const FlagsMI &rhs)
	Copy the given flags. More...

void	copyFlags (const FlagsMI &rhs, uint_t lsb, uint_t msb)
	Copy (some of) the given flags. More...

void	copyFlags (uint64_t flags, uint_t lsb, uint_t msb)
	Copy (some of) the given flags. More...

bool	getFlag (uint_t flagNum) const
	Get a user-defined flag. More...

void	setFlag (uint_t flagNum, bool val)
	Set a user-defined flag. More...

uint64_t	getFlagsNumber (uint64_t mask, uint64_t shift=0)
	Get a multi-bit value in the flags data (which is stored as one 64-bit integer). More...

void	setFlagsNumber (uint64_t mask, uint64_t shift, uint64_t num)
	Set a multi-bit value in the flags data (which is stored as one 64-bit integer). More...

uint64_t	getFlags () const
	Get the flags. More...

void	setFlags (uint64_t flags)
	Set the flags. More...

Detailed Description

Chained hashing collection.

Hashtable doesn't inherit from SortedCollection because objects in a hashtable aren't organized based on any ordering of search keys. The hash function is supposed to bring us straight to the object we're looking for, or at least to a very small group of objects that have the same hash. If utl::Collection::isMultiSet() is false, then add(const utl::Object*) won't permit you to add two objects that compare as equal, or whose keys compare as equal (if they have keys - see utl::Object::getKey()). Comparison of objects is also done by utl::Hashtable::find().

When multiple objects hash to the same location, they are put into a linked list (but only then).

You can either provide a hash function (in the constructor or by calling setHashFunction()), or you can ensure Object::hash() is defined for the contained objects or their keys (see Object::getKey()).

Advantages

add(const utl::Object*), find(), remove() are practically O(1) if:
– the hash function gives a fairly uniform distribution
– the hash table isn't allowed to grow too full
performance degrades in near-linear fashion as load factor is increased
low memory usage (probably ~1.4 pointers per contained object on average)

Disadvantages

contained objects are not sorted

Author: Adam McKee

Definition at line 92 of file Hashtable.h.

Constructor & Destructor Documentation

◆ Hashtable() [1/2]

utl::Hashtable::Hashtable	(	size_t	size,
		uint_t	maxLF = `90`,
		bool	owner = `true`,
		bool	multiSet = `false`,
		const HashFunction *	hfunc = `nullptr`
	)

inline

Constructor.

Parameters

size	initial size of hash-table
maxLF	(optional : 90) maximum load factor
owner	(optional : true) owner flag
multiSet	(optional : false) multiSet flag
hfunc	(optional) hash function

Definition at line 109 of file Hashtable.h.

References utl::init().

◆ Hashtable() [2/2]

utl::Hashtable::Hashtable	(	bool	owner,
		bool	multiSet = `false`,
		const HashFunction *	hfunc = `nullptr`
	)

inline

Constructor.

Parameters

owner	owner flag
multiSet	multiSet flag
hfunc	(optional) hash function

Definition at line 124 of file Hashtable.h.

References utl::init().

Member Function Documentation

◆ steal()

virtual void utl::Hashtable::steal ( Object & rhs )

virtual

"Steal" the internal representation from another instance.

The default implementation just calls vclone(), so you have to override this if you want a "move" capability.

Reimplemented from utl::Collection.

◆ vclone()

virtual void utl::Hashtable::vclone ( const Object & rhs )

virtual

Make an exact copy of another instance.

The default implementation just calls copy(), so you have to override this if you want different behavior for copy construction and cloning.

Reimplemented from utl::Collection.

◆ innerAllocatedSize()

virtual size_t utl::Hashtable::innerAllocatedSize ( ) const

virtual

Get the "inner" allocated size.

Reimplemented from utl::Collection.

◆ setHashFunction()

void utl::Hashtable::setHashFunction ( const HashFunction * hashfn )

inline

Set the hash function.

Definition at line 139 of file Hashtable.h.

References ASSERTD, const_cast_this, utl::deInit(), IFDEBUG, utl::init(), utl::ListNode::set(), and utl::FwdIt::setConst().

◆ reserve()

void utl::Hashtable::reserve ( size_t newSize )

Grow the hash-table to a size large enough to contain the given number of objects.

◆ find()

virtual Object* utl::Hashtable::find ( const Object & key ) const

virtual

Find an object matching a given key.

Returns: found object (nullptr if none)

Parameters

key	search key

Reimplemented from utl::Collection.

◆ findIt()

virtual void utl::Hashtable::findIt	(	const Object &	key,
		BidIt &	it
	)

virtual

Find an object matching a given key.

Parameters

key	search key
it	result iterator (= end() if no object found)

Reimplemented from utl::Collection.

◆ add()

virtual bool utl::Hashtable::add ( const Object * object )

virtual

Add an object to the collection.

Returns: true if successful, false otherwise

Parameters

object object to add

Implements utl::Collection.

◆ addOrFind()

virtual Object* utl::Hashtable::addOrFind ( const Object * object )

virtual

Add the given object, or find a matching object already contained.

Returns: found object (or provided object, if it was added)

Reimplemented from utl::Collection.

◆ addOrUpdate()

virtual bool utl::Hashtable::addOrUpdate ( const Object * object )

virtual

Add or update the given object.

If the object already exists, it will be updated, otherwise it will be added.

Returns: true if object was replaced, false if it was newly added

Parameters

object object to add or update

Reimplemented from utl::Collection.

◆ clear()

virtual void utl::Hashtable::clear ( )

virtual

Clear the collection by removing all objects.

Implements utl::Collection.

◆ excise()

void utl::Hashtable::excise ( )

Same as clear(), but in addition the pointer array is deleted.

Call this method instead of clear() when you want to minimize memory usage as much as possible.

◆ remove()

virtual bool utl::Hashtable::remove ( const Object & key )

virtual

Remove the object matching the given key.

Returns: true if object found and removed, false otherwise

Parameters

key	search key

Reimplemented from utl::Collection.

◆ removeIt()

virtual void utl::Hashtable::removeIt ( BidIt & it )

virtual

Remove the object the given iterator points to.

The iterator will be updated so that it points to the removed object's successor.

Parameters

it	iterator specifying object to be removed

Reimplemented from utl::Collection.

◆ beginNew() [1/2]

virtual BidIt* utl::Hashtable::beginNew ( ) const

virtual

Return a const iterator pointing to the beginning of the collection.

Implements utl::Collection.

◆ beginNew() [2/2]

virtual BidIt* utl::Hashtable::beginNew ( )

virtual

Return an iterator pointing to the beginning of the collection.

Implements utl::Collection.

◆ endNew() [1/2]

virtual BidIt* utl::Hashtable::endNew ( ) const

virtual

Return a const iterator pointing to the end of the collection.

Implements utl::Collection.

◆ endNew() [2/2]

virtual BidIt* utl::Hashtable::endNew ( )

virtual

Return an iterator pointing to the end of the collection.

Implements utl::Collection.

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Hashtable() [1/2]

◆ Hashtable() [2/2]

Member Function Documentation

◆ steal()

◆ vclone()

◆ innerAllocatedSize()

◆ setHashFunction()

◆ reserve()

◆ find()

◆ findIt()

◆ add()

◆ addOrFind()

◆ addOrUpdate()

◆ clear()

◆ excise()

◆ remove()

◆ removeIt()

◆ beginNew() [1/2]

◆ beginNew() [2/2]

◆ endNew() [1/2]

◆ endNew() [2/2]