Basic sparse set implementation. More...

#include <sparse_set.hpp>

Inheritance diagram for entt::basic_sparse_set< Entity, Allocator >:

[legend]

Public Types
using	traits_type = entt_traits< Entity >
	Entity traits.

using	entity_type = typename traits_type::value_type
	Underlying entity identifier.

using	version_type = typename traits_type::version_type
	Underlying version type.

using	size_type = std::size_t
	Unsigned integer type.

using	allocator_type = Allocator
	Allocator type.

using	pointer = typename packed_container_type::const_pointer
	Pointer type to contained entities.

using	iterator = basic_iterator
	Random access iterator type.

using	const_iterator = iterator
	Constant random access iterator type.

using	reverse_iterator = std::reverse_iterator< iterator >
	Reverse iterator type.

using	const_reverse_iterator = std::reverse_iterator< const_iterator >
	Constant reverse iterator type.

Public Member Functions
	basic_sparse_set ()
	Default constructor.

	basic_sparse_set (const allocator_type &allocator)
	Constructs an empty container with a given allocator.

	basic_sparse_set (deletion_policy pol, const allocator_type &allocator={})
	Constructs an empty container with the given policy and allocator.

	basic_sparse_set (const type_info &elem, deletion_policy pol=deletion_policy::swap_and_pop, const allocator_type &allocator={})
	Constructs an empty container with the given value type, policy and allocator.

	basic_sparse_set (basic_sparse_set &&other) noexcept
	Move constructor.

	basic_sparse_set (basic_sparse_set &&other, const allocator_type &allocator) noexcept
	Allocator-extended move constructor.

virtual	~basic_sparse_set ()
	Default destructor.

basic_sparse_set &	operator= (basic_sparse_set &&other) noexcept
	Move assignment operator.

void	swap (basic_sparse_set &other)
	Exchanges the contents with those of a given sparse set.

constexpr allocator_type	get_allocator () const noexcept
	Returns the associated allocator.

deletion_policy	policy () const noexcept
	Returns the deletion policy of a sparse set.

virtual void	reserve (const size_type cap)
	Increases the capacity of a sparse set.

virtual size_type	capacity () const noexcept
	Returns the number of elements that a sparse set has currently allocated space for.

virtual void	shrink_to_fit ()
	Requests the removal of unused capacity.

size_type	extent () const noexcept
	Returns the extent of a sparse set.

size_type	size () const noexcept
	Returns the number of elements in a sparse set.

bool	empty () const noexcept
	Checks whether a sparse set is empty.

bool	contiguous () const noexcept
	Checks whether a sparse set is fully packed.

pointer	data () const noexcept
	Direct access to the internal packed array.

const_iterator	begin () const noexcept
	Returns an iterator to the beginning.

const_iterator	cbegin () const noexcept
	Returns an iterator to the beginning.

iterator	end () const noexcept
	Returns an iterator to the end.

const_iterator	cend () const noexcept
	Returns an iterator to the end.

const_reverse_iterator	rbegin () const noexcept
	Returns a reverse iterator to the beginning.

const_reverse_iterator	crbegin () const noexcept
	Returns a reverse iterator to the beginning.

reverse_iterator	rend () const noexcept
	Returns a reverse iterator to the end.

const_reverse_iterator	crend () const noexcept
	Returns a reverse iterator to the end.

iterator	find (const entity_type entt) const noexcept
	Finds an entity.

bool	contains (const entity_type entt) const noexcept
	Checks if a sparse set contains an entity.

version_type	current (const entity_type entt) const noexcept
	Returns the contained version for an identifier.

size_type	index (const entity_type entt) const noexcept
	Returns the position of an entity in a sparse set.

entity_type	at (const size_type pos) const noexcept
	Returns the entity at specified location, with bounds checking.

entity_type	operator[] (const size_type pos) const noexcept
	Returns the entity at specified location, without bounds checking.

const void *	value (const entity_type entt) const noexcept
	Returns the element assigned to an entity, if any.

void *	value (const entity_type entt) noexcept
	Returns the element assigned to an entity, if any.

iterator	push (const entity_type entt, const void *elem=nullptr)
	Assigns an entity to a sparse set.

template<typename It >
iterator	push (It first, It last)
	Assigns one or more entities to a sparse set.

version_type	bump (const entity_type entt)
	Bump the version number of an entity.

void	erase (const entity_type entt)
	Erases an entity from a sparse set.

template<typename It >
void	erase (It first, It last)
	Erases entities from a set.

bool	remove (const entity_type entt)
	Removes an entity from a sparse set if it exists.

template<typename It >
size_type	remove (It first, It last)
	Removes entities from a sparse set if they exist.

void	compact ()
	Removes all tombstones from a sparse set.

void	swap_elements (const entity_type lhs, const entity_type rhs)
	Swaps two entities in a sparse set.

template<typename Compare , typename Sort = std_sort, typename... Args>
void	sort_n (const size_type length, Compare compare, Sort algo=Sort{}, Args &&...args)
	Sort the first count elements according to the given comparison function.

template<typename Compare , typename Sort = std_sort, typename... Args>
void	sort (Compare compare, Sort algo=Sort{}, Args &&...args)
	Sort all elements according to the given comparison function.

void	sort_as (const basic_sparse_set &other)
	Sort entities according to their order in another sparse set.

void	clear ()
	Clears a sparse set.

const type_info &	type () const noexcept
	Returned value type, if any.

virtual void	bind (any) noexcept
	Forwards variables to derived classes, if any.

Protected Types
using	basic_iterator = internal::sparse_set_iterator< packed_container_type >
	Random access iterator type.

Protected Member Functions
void	swap_at (const std::size_t lhs, const std::size_t rhs)
	Swaps two items at specific locations.

void	swap_and_pop (const basic_iterator it)
	Erases an entity from a sparse set.

void	in_place_pop (const basic_iterator it)
	Erases an entity from a sparse set.

virtual void	pop (basic_iterator first, basic_iterator last)
	Erases entities from a sparse set.

virtual void	pop_all ()
	Erases all entities of a sparse set.

virtual basic_iterator	try_emplace (const Entity entt, const bool force_back, const void *=nullptr)
	Assigns an entity to a sparse set.

Detailed Description

template<typename Entity, typename Allocator>
class entt::basic_sparse_set< Entity, Allocator >

Basic sparse set implementation.

Sparse set or packed array or whatever is the name users give it.
Two arrays: an external one and an internal one; a sparse one and a packed one; one used for direct access through contiguous memory, the other one used to get the data through an extra level of indirection.
This type of data structure is widely documented in the literature and on the web. This is nothing more than a customized implementation suitable for the purpose of the framework.

Note: Internal data structures arrange elements to maximize performance. There are no guarantees that entities are returned in the insertion order when iterate a sparse set. Do not make assumption on the order in any case.

Template Parameters

Entity	A valid entity type.
Allocator	Type of allocator used to manage memory and elements.

Definition at line 166 of file sparse_set.hpp.

Member Typedef Documentation

◆ allocator_type

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::allocator_type = Allocator

Allocator type.

Definition at line 339 of file sparse_set.hpp.

◆ basic_iterator

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::basic_iterator = internal::sparse_set_iterator<packed_container_type>

protected

Random access iterator type.

Definition at line 228 of file sparse_set.hpp.

◆ const_iterator

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::const_iterator = iterator

Constant random access iterator type.

Definition at line 345 of file sparse_set.hpp.

◆ const_reverse_iterator

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::const_reverse_iterator = std::reverse_iterator<const_iterator>

Constant reverse iterator type.

Definition at line 349 of file sparse_set.hpp.

◆ entity_type

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::entity_type = typename traits_type::value_type

Underlying entity identifier.

Definition at line 333 of file sparse_set.hpp.

◆ iterator

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::iterator = basic_iterator

Random access iterator type.

Definition at line 343 of file sparse_set.hpp.

◆ pointer

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::pointer = typename packed_container_type::const_pointer

Pointer type to contained entities.

Definition at line 341 of file sparse_set.hpp.

◆ reverse_iterator

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::reverse_iterator = std::reverse_iterator<iterator>

Reverse iterator type.

Definition at line 347 of file sparse_set.hpp.

◆ size_type

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::size_type = std::size_t

Unsigned integer type.

Definition at line 337 of file sparse_set.hpp.

◆ traits_type

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::traits_type = entt_traits<Entity>

Entity traits.

Definition at line 331 of file sparse_set.hpp.

◆ version_type

template<typename Entity , typename Allocator >

using entt::basic_sparse_set< Entity, Allocator >::version_type = typename traits_type::version_type

Underlying version type.

Definition at line 335 of file sparse_set.hpp.

Constructor & Destructor Documentation

◆ basic_sparse_set() [1/6]

template<typename Entity , typename Allocator >

entt::basic_sparse_set< Entity, Allocator >::basic_sparse_set ( )

inline

Default constructor.

Definition at line 352 of file sparse_set.hpp.

◆ basic_sparse_set() [2/6]

template<typename Entity , typename Allocator >

entt::basic_sparse_set< Entity, Allocator >::basic_sparse_set ( const allocator_type & allocator )

inlineexplicit

Constructs an empty container with a given allocator.

Parameters

allocator The allocator to use.

Definition at line 359 of file sparse_set.hpp.

◆ basic_sparse_set() [3/6]

template<typename Entity , typename Allocator >

entt::basic_sparse_set< Entity, Allocator >::basic_sparse_set	(	deletion_policy	pol,
		const allocator_type &	allocator = `{}`
	)

inlineexplicit

Constructs an empty container with the given policy and allocator.

Parameters

pol	Type of deletion policy.
allocator	The allocator to use (possibly default-constructed).

Definition at line 367 of file sparse_set.hpp.

◆ basic_sparse_set() [4/6]

template<typename Entity , typename Allocator >

entt::basic_sparse_set< Entity, Allocator >::basic_sparse_set	(	const type_info &	elem,
		deletion_policy	pol = `deletion_policy::swap_and_pop`,
		const allocator_type &	allocator = `{}`
	)

inlineexplicit

Constructs an empty container with the given value type, policy and allocator.

Parameters

elem	Returned value type, if any.
pol	Type of deletion policy.
allocator	The allocator to use (possibly default-constructed).

Definition at line 377 of file sparse_set.hpp.

◆ basic_sparse_set() [5/6]

template<typename Entity , typename Allocator >

entt::basic_sparse_set< Entity, Allocator >::basic_sparse_set ( basic_sparse_set< Entity, Allocator > && other )

inlinenoexcept

Move constructor.

Parameters

other The instance to move from.

Definition at line 388 of file sparse_set.hpp.

◆ basic_sparse_set() [6/6]

template<typename Entity , typename Allocator >

entt::basic_sparse_set< Entity, Allocator >::basic_sparse_set	(	basic_sparse_set< Entity, Allocator > &&	other,
		const allocator_type &	allocator
	)

inlinenoexcept

Allocator-extended move constructor.

Parameters

other	The instance to move from.
allocator	The allocator to use.

Definition at line 400 of file sparse_set.hpp.

◆ ~basic_sparse_set()

template<typename Entity , typename Allocator >

virtual entt::basic_sparse_set< Entity, Allocator >::~basic_sparse_set ( )

inlinevirtual

Default destructor.

Definition at line 410 of file sparse_set.hpp.

Member Function Documentation

◆ at()

template<typename Entity , typename Allocator >

entity_type entt::basic_sparse_set< Entity, Allocator >::at ( const size_type pos ) const

inlinenoexcept

Returns the entity at specified location, with bounds checking.

Parameters

pos	The position for which to return the entity.

Returns: The entity at specified location if any, a null entity otherwise.

Definition at line 656 of file sparse_set.hpp.

◆ begin()

template<typename Entity , typename Allocator >

const_iterator entt::basic_sparse_set< Entity, Allocator >::begin ( ) const

inlinenoexcept

Returns an iterator to the beginning.

If the sparse set is empty, the returned iterator will be equal to end().

Returns: An iterator to the first entity of the sparse set.

Definition at line 546 of file sparse_set.hpp.

◆ bind()

template<typename Entity , typename Allocator >

virtual void entt::basic_sparse_set< Entity, Allocator >::bind ( any )

inlinevirtualnoexcept

Forwards variables to derived classes, if any.

Definition at line 985 of file sparse_set.hpp.

◆ bump()

template<typename Entity , typename Allocator >

version_type entt::basic_sparse_set< Entity, Allocator >::bump ( const entity_type entt )

inline

Bump the version number of an entity.

Warning: Attempting to bump the version of an entity that doesn't belong to the sparse set results in undefined behavior.

Parameters

entt	A valid identifier.

Returns: The version of the given identifier.

Definition at line 737 of file sparse_set.hpp.

◆ capacity()

template<typename Entity , typename Allocator >

virtual size_type entt::basic_sparse_set< Entity, Allocator >::capacity ( ) const

inlinevirtualnoexcept

Returns the number of elements that a sparse set has currently allocated space for.

Returns: Capacity of the sparse set.

Reimplemented in entt::basic_storage< Type, Entity, Allocator, typename >, and entt::basic_storage< Mask, Registry::entity_type, Allocator >.

Definition at line 477 of file sparse_set.hpp.

◆ cbegin()

template<typename Entity , typename Allocator >

const_iterator entt::basic_sparse_set< Entity, Allocator >::cbegin ( ) const

inlinenoexcept

Returns an iterator to the beginning.

If the sparse set is empty, the returned iterator will be equal to end().

Returns: An iterator to the first entity of the sparse set.

Definition at line 552 of file sparse_set.hpp.

◆ cend()

template<typename Entity , typename Allocator >

const_iterator entt::basic_sparse_set< Entity, Allocator >::cend ( ) const

inlinenoexcept

Returns an iterator to the end.

Returns: An iterator to the element following the last entity of a sparse set.

Definition at line 566 of file sparse_set.hpp.

◆ clear()

template<typename Entity , typename Allocator >

void entt::basic_sparse_set< Entity, Allocator >::clear ( )

inline

Clears a sparse set.

Definition at line 968 of file sparse_set.hpp.

◆ compact()

template<typename Entity , typename Allocator >

void entt::basic_sparse_set< Entity, Allocator >::compact ( )

inline

Removes all tombstones from a sparse set.

Definition at line 824 of file sparse_set.hpp.

◆ contains()

template<typename Entity , typename Allocator >

bool entt::basic_sparse_set< Entity, Allocator >::contains ( const entity_type entt ) const

inlinenoexcept

Checks if a sparse set contains an entity.

Parameters

entt	A valid identifier.

Returns: True if the sparse set contains the entity, false otherwise.

Definition at line 617 of file sparse_set.hpp.

◆ contiguous()

template<typename Entity , typename Allocator >

bool entt::basic_sparse_set< Entity, Allocator >::contiguous ( ) const

inlinenoexcept

Checks whether a sparse set is fully packed.

Returns: True if the sparse set is fully packed, false otherwise.

Definition at line 526 of file sparse_set.hpp.

◆ crbegin()

template<typename Entity , typename Allocator >

const_reverse_iterator entt::basic_sparse_set< Entity, Allocator >::crbegin ( ) const

inlinenoexcept

Returns a reverse iterator to the beginning.

If the sparse set is empty, the returned iterator will be equal to rend().

Returns: An iterator to the first entity of the reversed internal packed array.

Definition at line 584 of file sparse_set.hpp.

◆ crend()

template<typename Entity , typename Allocator >

const_reverse_iterator entt::basic_sparse_set< Entity, Allocator >::crend ( ) const

inlinenoexcept

Returns a reverse iterator to the end.

Returns: An iterator to the element following the last entity of the reversed sparse set.

Definition at line 598 of file sparse_set.hpp.

◆ current()

template<typename Entity , typename Allocator >

version_type entt::basic_sparse_set< Entity, Allocator >::current ( const entity_type entt ) const

inlinenoexcept

Returns the contained version for an identifier.

Parameters

entt	A valid identifier.

Returns: The version for the given identifier if present, the tombstone version otherwise.

Definition at line 630 of file sparse_set.hpp.

◆ data()

template<typename Entity , typename Allocator >

pointer entt::basic_sparse_set< Entity, Allocator >::data ( ) const

inlinenoexcept

Direct access to the internal packed array.

Returns: A pointer to the internal packed array.

Definition at line 534 of file sparse_set.hpp.

◆ empty()

template<typename Entity , typename Allocator >

bool entt::basic_sparse_set< Entity, Allocator >::empty ( ) const

inlinenoexcept

Checks whether a sparse set is empty.

Returns: True if the sparse set is empty, false otherwise.

Definition at line 518 of file sparse_set.hpp.

◆ end()

template<typename Entity , typename Allocator >

iterator entt::basic_sparse_set< Entity, Allocator >::end ( ) const

inlinenoexcept

Returns an iterator to the end.

Returns: An iterator to the element following the last entity of a sparse set.

Definition at line 561 of file sparse_set.hpp.

◆ erase() [1/2]

template<typename Entity , typename Allocator >

void entt::basic_sparse_set< Entity, Allocator >::erase ( const entity_type entt )

inline

Erases an entity from a sparse set.

Warning: Attempting to erase an entity that doesn't belong to the sparse set results in undefined behavior.

Parameters

entt	A valid identifier.

Definition at line 754 of file sparse_set.hpp.

◆ erase() [2/2]

template<typename Entity , typename Allocator >

template<typename It >

void entt::basic_sparse_set< Entity, Allocator >::erase	(	It	first,
		It	last
	)

inline

Erases entities from a set.

See also: erase

Template Parameters

It	Type of input iterator.

Parameters

first	An iterator to the first element of the range of entities.
last	An iterator past the last element of the range of entities.

Definition at line 769 of file sparse_set.hpp.

◆ extent()

template<typename Entity , typename Allocator >

size_type entt::basic_sparse_set< Entity, Allocator >::extent ( ) const

inlinenoexcept

Returns the extent of a sparse set.

The extent of a sparse set is also the size of the internal sparse array. There is no guarantee that the internal packed array has the same size. Usually the size of the internal sparse array is equal or greater than the one of the internal packed array.

Returns: Extent of the sparse set.

Definition at line 496 of file sparse_set.hpp.

◆ find()

template<typename Entity , typename Allocator >

iterator entt::basic_sparse_set< Entity, Allocator >::find ( const entity_type entt ) const

inlinenoexcept

Finds an entity.

Parameters

entt	A valid identifier.

Returns: An iterator to the given entity if it's found, past the end iterator otherwise.

Definition at line 608 of file sparse_set.hpp.

◆ get_allocator()

template<typename Entity , typename Allocator >

constexpr allocator_type entt::basic_sparse_set< Entity, Allocator >::get_allocator ( ) const

inlineconstexprnoexcept

Returns the associated allocator.

Returns: The associated allocator.

Definition at line 448 of file sparse_set.hpp.

◆ in_place_pop()

template<typename Entity , typename Allocator >

void entt::basic_sparse_set< Entity, Allocator >::in_place_pop ( const basic_iterator it )

inlineprotected

Erases an entity from a sparse set.

Parameters

it	An iterator to the element to pop.

Definition at line 267 of file sparse_set.hpp.

◆ index()

template<typename Entity , typename Allocator >

size_type entt::basic_sparse_set< Entity, Allocator >::index ( const entity_type entt ) const

inlinenoexcept

Returns the position of an entity in a sparse set.

Warning: Attempting to get the position of an entity that doesn't belong to the sparse set results in undefined behavior.

Parameters

entt	A valid identifier.

Returns: The position of the entity in the sparse set.

Definition at line 646 of file sparse_set.hpp.

◆ operator=()

template<typename Entity , typename Allocator >

basic_sparse_set & entt::basic_sparse_set< Entity, Allocator >::operator= ( basic_sparse_set< Entity, Allocator > && other )

inlinenoexcept

Move assignment operator.

Parameters

other The instance to move from.

Returns: This sparse set.

Definition at line 419 of file sparse_set.hpp.

◆ operator[]()

template<typename Entity , typename Allocator >

entity_type entt::basic_sparse_set< Entity, Allocator >::operator[] ( const size_type pos ) const

inlinenoexcept

Returns the entity at specified location, without bounds checking.

Parameters

pos	The position for which to return the entity.

Returns: The entity at specified location.

Definition at line 665 of file sparse_set.hpp.

◆ policy()

template<typename Entity , typename Allocator >

deletion_policy entt::basic_sparse_set< Entity, Allocator >::policy ( ) const

inlinenoexcept

Returns the deletion policy of a sparse set.

Returns: The deletion policy of the sparse set.

Definition at line 456 of file sparse_set.hpp.

◆ pop()

template<typename Entity , typename Allocator >

virtual void entt::basic_sparse_set< Entity, Allocator >::pop	(	basic_iterator	first,
		basic_iterator	last
	)

inlineprotectedvirtual

Erases entities from a sparse set.

Parameters

first	An iterator to the first element of the range of entities.
last	An iterator past the last element of the range of entities.

Reimplemented in entt::basic_storage< Type, Entity, Allocator, typename >, entt::basic_storage< Mask, Registry::entity_type, Allocator >, and entt::basic_storage< Entity, Entity, Allocator >.

Definition at line 279 of file sparse_set.hpp.

◆ pop_all()

template<typename Entity , typename Allocator >

virtual void entt::basic_sparse_set< Entity, Allocator >::pop_all ( )

inlineprotectedvirtual

Erases all entities of a sparse set.

Reimplemented in entt::basic_storage< Type, Entity, Allocator, typename >, entt::basic_storage< Mask, Registry::entity_type, Allocator >, and entt::basic_storage< Entity, Entity, Allocator >.

Definition at line 292 of file sparse_set.hpp.

◆ push() [1/2]

template<typename Entity , typename Allocator >

iterator entt::basic_sparse_set< Entity, Allocator >::push	(	const entity_type	entt,
		const void *	elem = `nullptr`
	)

inline

Assigns an entity to a sparse set.

Warning: Attempting to assign an entity that already belongs to the sparse set results in undefined behavior.

Parameters

entt	A valid identifier.
elem	Optional opaque element to forward to mixins, if any.

Returns: Iterator pointing to the emplaced element in case of success, the end() iterator otherwise.

Definition at line 701 of file sparse_set.hpp.

◆ push() [2/2]

template<typename Entity , typename Allocator >

template<typename It >

iterator entt::basic_sparse_set< Entity, Allocator >::push	(	It	first,
		It	last
	)

inline

Assigns one or more entities to a sparse set.

Warning: Attempting to assign an entity that already belongs to the sparse set results in undefined behavior.

Template Parameters

It	Type of input iterator.

Parameters

first	An iterator to the first element of the range of entities.
last	An iterator past the last element of the range of entities.

Returns: Iterator pointing to the first element inserted in case of success, the end() iterator otherwise.

Definition at line 719 of file sparse_set.hpp.

◆ rbegin()

template<typename Entity , typename Allocator >

const_reverse_iterator entt::basic_sparse_set< Entity, Allocator >::rbegin ( ) const

inlinenoexcept

Returns a reverse iterator to the beginning.

If the sparse set is empty, the returned iterator will be equal to rend().

Returns: An iterator to the first entity of the reversed internal packed array.

Definition at line 579 of file sparse_set.hpp.

◆ remove() [1/2]

template<typename Entity , typename Allocator >

bool entt::basic_sparse_set< Entity, Allocator >::remove ( const entity_type entt )

inline

Removes an entity from a sparse set if it exists.

Parameters

entt	A valid identifier.

Returns: True if the entity is actually removed, false otherwise.

Definition at line 784 of file sparse_set.hpp.

◆ remove() [2/2]

template<typename Entity , typename Allocator >

template<typename It >

size_type entt::basic_sparse_set< Entity, Allocator >::remove	(	It	first,
		It	last
	)

inline

Removes entities from a sparse set if they exist.

Template Parameters

It	Type of input iterator.

Parameters

first	An iterator to the first element of the range of entities.
last	An iterator past the last element of the range of entities.

Returns: The number of entities actually removed.

Definition at line 796 of file sparse_set.hpp.

◆ rend()

template<typename Entity , typename Allocator >

reverse_iterator entt::basic_sparse_set< Entity, Allocator >::rend ( ) const

inlinenoexcept

Returns a reverse iterator to the end.

Returns: An iterator to the element following the last entity of the reversed sparse set.

Definition at line 593 of file sparse_set.hpp.

◆ reserve()

template<typename Entity , typename Allocator >

virtual void entt::basic_sparse_set< Entity, Allocator >::reserve ( const size_type cap )

inlinevirtual

Increases the capacity of a sparse set.

If the new capacity is greater than the current capacity, new storage is allocated, otherwise the method does nothing.

Parameters

cap	Desired capacity.

Reimplemented in entt::basic_storage< Type, Entity, Allocator, typename >, and entt::basic_storage< Mask, Registry::entity_type, Allocator >.

Definition at line 468 of file sparse_set.hpp.

◆ shrink_to_fit()

template<typename Entity , typename Allocator >

virtual void entt::basic_sparse_set< Entity, Allocator >::shrink_to_fit ( )

inlinevirtual

Requests the removal of unused capacity.

Reimplemented in entt::basic_storage< Type, Entity, Allocator, typename >, and entt::basic_storage< Mask, Registry::entity_type, Allocator >.

Definition at line 482 of file sparse_set.hpp.

◆ size()

template<typename Entity , typename Allocator >

size_type entt::basic_sparse_set< Entity, Allocator >::size ( ) const

inlinenoexcept

Returns the number of elements in a sparse set.

The number of elements is also the size of the internal packed array. There is no guarantee that the internal sparse array has the same size. Usually the size of the internal sparse array is equal or greater than the one of the internal packed array.

Returns: Number of elements.

Definition at line 510 of file sparse_set.hpp.

◆ sort()

template<typename Entity , typename Allocator >

template<typename Compare , typename Sort = std_sort, typename... Args>

void entt::basic_sparse_set< Entity, Allocator >::sort	(	Compare	compare,
		Sort	algo = `Sort{}`,
		Args &&...	args
	)

inline

Sort all elements according to the given comparison function.

See also: sort_n

Template Parameters

Compare	Type of comparison function object.
Sort	Type of sort function object.
Args	Types of arguments to forward to the sort function object.

Parameters

compare	A valid comparison function object.
algo	A valid sort function object.
args	Arguments to forward to the sort function object, if any.

Definition at line 934 of file sparse_set.hpp.

◆ sort_as()

template<typename Entity , typename Allocator >

void entt::basic_sparse_set< Entity, Allocator >::sort_as ( const basic_sparse_set< Entity, Allocator > & other )

inline

Sort entities according to their order in another sparse set.

Entities that are part of both the sparse sets are ordered internally according to the order they have in other.
All the other entities goes to the end of the list and there are no guarantees on their order.

Parameters

other The sparse sets that imposes the order of the entities.

Definition at line 949 of file sparse_set.hpp.

◆ sort_n()

template<typename Entity , typename Allocator >

template<typename Compare , typename Sort = std_sort, typename... Args>

void entt::basic_sparse_set< Entity, Allocator >::sort_n	(	const size_type	length,
		Compare	compare,
		Sort	algo = `Sort{}`,
		Args &&...	args
	)

inline

Sort the first count elements according to the given comparison function.

The comparison function object must return true if the first element is less than the second one, false otherwise. The signature of the comparison function should be equivalent to the following:

bool(const Entity, const Entity);

Moreover, the comparison function object shall induce a strict weak ordering on the values.

The sort function object must offer a member function template operator() that accepts three arguments:

An iterator to the first element of the range to sort.
An iterator past the last element of the range to sort.
A comparison function to use to compare the elements.

Template Parameters

Compare	Type of comparison function object.
Sort	Type of sort function object.
Args	Types of arguments to forward to the sort function object.

Parameters

length	Number of elements to sort.
compare	A valid comparison function object.
algo	A valid sort function object.
args	Arguments to forward to the sort function object, if any.

Definition at line 899 of file sparse_set.hpp.

◆ swap()

template<typename Entity , typename Allocator >

void entt::basic_sparse_set< Entity, Allocator >::swap ( basic_sparse_set< Entity, Allocator > & other )

inline

Exchanges the contents with those of a given sparse set.

Parameters

other Sparse set to exchange the content with.

Definition at line 435 of file sparse_set.hpp.

◆ swap_and_pop()

template<typename Entity , typename Allocator >

void entt::basic_sparse_set< Entity, Allocator >::swap_and_pop ( const basic_iterator it )

inlineprotected

Erases an entity from a sparse set.

Parameters

it	An iterator to the element to pop.

Definition at line 250 of file sparse_set.hpp.

◆ swap_at()

template<typename Entity , typename Allocator >

void entt::basic_sparse_set< Entity, Allocator >::swap_at	(	const std::size_t	lhs,
		const std::size_t	rhs
	)

inlineprotected

Swaps two items at specific locations.

Parameters

lhs	A position to move from.
rhs	The other position to move from.

Definition at line 235 of file sparse_set.hpp.

◆ swap_elements()

template<typename Entity , typename Allocator >

void entt::basic_sparse_set< Entity, Allocator >::swap_elements	(	const entity_type	lhs,
		const entity_type	rhs
	)

inline

Swaps two entities in a sparse set.

For what it's worth, this function affects both the internal sparse array and the internal packed array. Users should not care of that anyway.

Warning: Attempting to swap entities that don't belong to the sparse set results in undefined behavior.

Parameters

lhs	A valid identifier.
rhs	A valid identifier.

Definition at line 859 of file sparse_set.hpp.

◆ try_emplace()

template<typename Entity , typename Allocator >

virtual basic_iterator entt::basic_sparse_set< Entity, Allocator >::try_emplace	(	const Entity	entt,
		const bool	force_back,
		const void *	= `nullptr`
	)

inlineprotectedvirtual

Assigns an entity to a sparse set.

Parameters

entt	A valid identifier.
force_back	Force back insertion.

Returns: Iterator pointing to the emplaced element.

Reimplemented in entt::basic_storage< Type, Entity, Allocator, typename >, and entt::basic_storage< Entity, Entity, Allocator >.

Definition at line 314 of file sparse_set.hpp.

◆ type()

template<typename Entity , typename Allocator >

const type_info & entt::basic_sparse_set< Entity, Allocator >::type ( ) const

inlinenoexcept

Returned value type, if any.

Returns: Returned value type, if any.

Definition at line 980 of file sparse_set.hpp.

◆ value() [1/2]

template<typename Entity , typename Allocator >

const void * entt::basic_sparse_set< Entity, Allocator >::value ( const entity_type entt ) const

inlinenoexcept

Returns the element assigned to an entity, if any.

Warning: Attempting to use an entity that doesn't belong to the sparse set results in undefined behavior.

Parameters

entt	A valid identifier.

Returns: An opaque pointer to the element assigned to the entity, if any.

Definition at line 680 of file sparse_set.hpp.

◆ value() [2/2]

template<typename Entity , typename Allocator >

void * entt::basic_sparse_set< Entity, Allocator >::value ( const entity_type entt )

inlinenoexcept

Returns the element assigned to an entity, if any.

Warning: Attempting to use an entity that doesn't belong to the sparse set results in undefined behavior.

Parameters

entt	A valid identifier.

Returns: An opaque pointer to the element assigned to the entity, if any.

Definition at line 685 of file sparse_set.hpp.

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

src/entt/entity/fwd.hpp
src/entt/entity/sparse_set.hpp

Public Types

Public Member Functions

Protected Types

Protected Member Functions

Detailed Description

Member Typedef Documentation

◆ allocator_type

◆ basic_iterator

◆ const_iterator

◆ const_reverse_iterator

◆ entity_type

◆ iterator

◆ pointer

◆ reverse_iterator

◆ size_type

◆ traits_type

◆ version_type

Constructor & Destructor Documentation

◆ basic_sparse_set() [1/6]

◆ basic_sparse_set() [2/6]

◆ basic_sparse_set() [3/6]

◆ basic_sparse_set() [4/6]

◆ basic_sparse_set() [5/6]

◆ basic_sparse_set() [6/6]

◆ ~basic_sparse_set()

Member Function Documentation

◆ at()

◆ begin()

◆ bind()

◆ bump()

◆ capacity()

◆ cbegin()

◆ cend()

◆ clear()

◆ compact()

◆ contains()

◆ contiguous()

◆ crbegin()

◆ crend()

◆ current()

◆ data()

◆ empty()

◆ end()

◆ erase() [1/2]

◆ erase() [2/2]

◆ extent()

◆ find()

◆ get_allocator()

◆ in_place_pop()

◆ index()

◆ operator=()

◆ operator[]()

◆ policy()

◆ pop()

◆ pop_all()

◆ push() [1/2]

◆ push() [2/2]

◆ rbegin()

◆ remove() [1/2]

◆ remove() [2/2]

◆ rend()

◆ reserve()

◆ shrink_to_fit()

◆ size()

◆ sort()

◆ sort_as()

◆ sort_n()

◆ swap()

◆ swap_and_pop()

◆ swap_at()

◆ swap_elements()

◆ try_emplace()

◆ type()

◆ value() [1/2]

◆ value() [2/2]