[][src]Struct specs::world::EntityBuilder

#[must_use = "Please call .build() on this to finish building it."]
pub struct EntityBuilder<'a> {
    pub entity: Entity,
    pub world: &'a World,
    // some fields omitted
}

The entity builder, allowing to build an entity together with its components.

Examples

use specs::{prelude::*, storage::HashMapStorage};

struct Health(f32);

impl Component for Health {
    type Storage = HashMapStorage<Self>;
}

struct Pos {
    x: f32,
    y: f32,
}

impl Component for Pos {
    type Storage = DenseVecStorage<Self>;
}

let mut world = World::new();
world.register::<Health>();
world.register::<Pos>();

let entity = world
    .create_entity() // This call returns `EntityBuilder`
    .with(Health(4.0))
    .with(Pos { x: 1.0, y: 3.0 })
    .build(); // Returns the `Entity`

Distinguishing Mandatory Components from Optional Components

use specs::{prelude::*, storage::HashMapStorage};

struct MandatoryHealth(f32);

impl Component for MandatoryHealth {
    type Storage = HashMapStorage<Self>;
}

struct OptionalPos {
    x: f32,
    y: f32,
}

impl Component for OptionalPos {
    type Storage = DenseVecStorage<Self>;
}

let mut world = World::new();
world.register::<MandatoryHealth>();
world.register::<OptionalPos>();

let mut entitybuilder = world.create_entity().with(MandatoryHealth(4.0));

// something trivial to serve as our conditional
let include_optional = true;

if include_optional == true {
    entitybuilder = entitybuilder.with(OptionalPos { x: 1.0, y: 3.0 })
}

let entity = entitybuilder.build();

Fields

entity: Entity

The (already created) entity for which components will be inserted.

world: &'a World

A reference to the World for component insertions.

Trait Implementations

impl<'a> Builder for EntityBuilder<'a>[src]

fn with<T: Component>(self, c: T) -> Self[src]

Inserts a component for this entity.

If a component was already associated with the entity, it will overwrite the previous component.

fn build(self) -> Entity[src]

Finishes the building and returns the entity. As opposed to LazyBuilder, the components are available immediately.

impl<'a> Drop for EntityBuilder<'a>[src]

impl<'a> MarkedBuilder for EntityBuilder<'a>[src]

Auto Trait Implementations

impl<'a> !RefUnwindSafe for EntityBuilder<'a>

impl<'a> Send for EntityBuilder<'a>

impl<'a> Sync for EntityBuilder<'a>

impl<'a> Unpin for EntityBuilder<'a>

impl<'a> !UnwindSafe for EntityBuilder<'a>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Any for T where
    T: Any
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> Event for T where
    T: Send + Sync + 'static, 
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T> Resource for T where
    T: Any + Send + Sync
[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<V, T> VZip<V> for T where
    V: MultiLane<T>, 
[src]