EntityManager

Manages entities and their associated components.

class EntityManager {

this(EventManager events);

Range opSlice();

auto entities();

size_t count();

size_t free();

size_t capacity();

bool empty();

Entity entity(uint index);

Entity entity(ID id);

ID id(uint index);

bool valid(ID id);

Entity create();

void destroy(ID id);

void addComponent(ID id, C component);

void removeComponent(ID id);

bool hasComponent(ID id);

inout(C) component(ID id);

void clear();

}

Constructors

this this(EventManager events): Construct an empty entity manager.

Members

Functions

addComponent void addComponent(ID id, C component): Add a component to the specified entity.
capacity size_t capacity(): Return the maximum capacity of entities before needing reallocation.
clear void clear(): Delete all entities and components.
component inout(C) component(ID id): Return the component associated with this entity.
count size_t count(): Return the number of entities.
create Entity create(): Create an entity in a free slot.
destroy void destroy(ID id): Destroy the specified entity and invalidate all handles to it.
empty bool empty(): Return if and only if there are no entities.
entities auto entities(): Create a range with only the entities with the specified components.
entity Entity entity(uint index): Return the entity with the specified index.
entity Entity entity(ID id): Return the entity with the specified (and valid) id. Returns null if the id is invalid.
free size_t free(): Return the number of free entity indices.
hasComponent bool hasComponent(ID id): Check if the entity has the specified component.
id ID id(uint index): Return the id with the specified index.
opSlice Range opSlice(): Return a range over the entities.
removeComponent void removeComponent(ID id): Remove a component from the entity (no effects if it is not present).
valid bool valid(ID id): Check if this entity handle is valid - is not invalidated or outdated

Structs

Range struct Range: A range over all entities in the manager.

Meta

Source

See Implementation

star entity classes

mixin templates

structs