Struct legion::systems::CommandBuffer[][src]

pub struct CommandBuffer { /* fields omitted */ }
Expand description

A command buffer used to queue mutable changes to the world from a system. This buffer is automatically flushed and refreshed at the beginning of every frame by Schedule. If Schedule is not used, then the user needs to manually flush it by performing CommandBuffer::flush.

Examples

Inserting an entity using the CommandBuffer:

let mut command_buffer = CommandBuffer::new(&world);
let entity = command_buffer.push(());

command_buffer.add_component(entity, Position(123.0));
command_buffer.remove(entity);

command_buffer.flush(&mut world, &mut resources);

Implementations

Constructs an empty command buffer.

Gets the ID of the world this command buffer belongs to.

Flushes this command buffer, draining all stored commands and writing them to the world.

Command flushes are performed in a FIFO manner, allowing for reliable, linear commands being executed in the order they were provided.

Executes an arbitrary closure against the mutable world, allowing for queued exclusive access to the world.

Queues the insertion of a single entity into the world.

Queues the insertion of new entities into the world.

Queues the deletion of an entity in the command buffer.

Queues the addition of a component from an entity in the command buffer.

Queues the removal of a component from an entity in the command buffer.

Returns the current number of commands already queued in this CommandBuffer instance.

Returns true if this CommandBuffer is currently empty and contains no writers.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait. Read more

Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait. Read more

Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s. Read more

Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s. Read more

Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait. Read more

Performs the conversion.

Performs the conversion.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.