Struct Group 

pub struct Group { /* private fields */ }

A struct representing a group of entities in the ECS game systems.

Implementations

impl Group

pub fn get_count(&self) -> i32

Gets the number of entities in the group.

pub fn get_first(&self) -> Option<Entity>

Gets the first entity in the group.

pub fn find(&self, predicate: Box<dyn FnMut(&Entity) -> bool>) -> Option<Entity>

Finds the first entity in the group that satisfies a predicate function.

Arguments

• predicate - The predicate function to test each entity with.

Returns

• Option<Entity> - The first entity that satisfies the predicate, or None if no entity does.

pub fn new(components: &Vec<&str>) -> Group

A method that creates a new group with the specified component names.

Arguments

• components - A vector listing the names of the components to include in the group.

Returns

• Group - The new group.

impl Group

pub fn watch( &mut self, callback: Box<dyn FnMut(&mut CallStack) -> bool>, ) -> &mut Group

Watches the group for changes to its entities, calling a function whenever an entity is added or changed.

Arguments

• callback - The function to call when an entity is added or changed. Returns true to stop watching.

Returns

• Group - The same group, for method chaining.

pub fn each(&self, visitor: Box<dyn FnMut(&Entity) -> bool>) -> bool

Calls a function for each entity in the group.

Arguments

• visitor - The function to call for each entity. Returning true inside the function will stop iteration.

Returns

• bool - Returns false if all entities were processed, true if the iteration was interrupted.

Trait Implementations

impl Clone for Group

fn clone(&self) -> Group

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Drop for Group

fn drop(&mut self)

Executes the destructor for this type.

impl IObject for Group

fn raw(&self) -> i64

fn obj(&self) -> &dyn IObject

fn as_any(&self) -> &dyn Any

fn get_id(&self) -> i32