Systems

Struct Systems 

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pub struct Systems { /* private fields */ }
Expand description

Container for systems in a schedule.

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impl Systems

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pub fn len(&self) -> usize

Returns the number of systems in this container.

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pub fn is_empty(&self) -> bool

Returns true if this container is empty.

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pub fn get(&self, key: SystemKey) -> Option<&SystemWithAccess>

Returns a reference to the system with the given key, if it exists.

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pub fn get_mut(&mut self, key: SystemKey) -> Option<&mut SystemWithAccess>

Returns a mutable reference to the system with the given key, if it exists.

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pub fn has_conditions(&self, key: SystemKey) -> bool

Returns true if the system with the given key has conditions.

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pub fn get_conditions(&self, key: SystemKey) -> Option<&[ConditionWithAccess]>

Returns a reference to the conditions for the system with the given key, if it exists.

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pub fn get_conditions_mut( &mut self, key: SystemKey, ) -> Option<&mut Vec<ConditionWithAccess>>

Returns a mutable reference to the conditions for the system with the given key, if it exists.

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pub fn iter( &self, ) -> impl Iterator<Item = (SystemKey, &ScheduleSystem, &[ConditionWithAccess])> + '_

Returns an iterator over all systems and their conditions in this container.

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pub fn insert( &mut self, system: ScheduleSystem, conditions: Vec<Box<dyn ReadOnlySystem<In = (), Out = bool>>>, ) -> SystemKey

Inserts a new system into the container, along with its conditions, and queues it to be initialized later in Systems::initialize.

We have to defer initialization of systems in the container until we have &mut World access, so we store these in a list until Systems::initialize is called. This is usually done upon the first run of the schedule.

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pub fn is_initialized(&self) -> bool

Returns true if all systems in this container have been initialized.

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pub fn initialize(&mut self, world: &mut World)

Initializes all systems and their conditions that have not been initialized yet.

Trait Implementations§

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impl Default for Systems

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fn default() -> Systems

Returns the “default value” for a type. Read more
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impl Index<SystemKey> for Systems

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type Output = SystemWithAccess

The returned type after indexing.
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fn index(&self, key: SystemKey) -> &Self::Output

Performs the indexing (container[index]) operation. Read more
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impl IndexMut<SystemKey> for Systems

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fn index_mut(&mut self, key: SystemKey) -> &mut Self::Output

Performs the mutable indexing (container[index]) operation. Read more

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> Downcast for T
where T: Any,

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fn into_any(self: Box<T>) -> Box<dyn Any>

Converts Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>, which can then be downcast into Box<dyn ConcreteType> where ConcreteType implements Trait.
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Converts Rc<Trait> (where Trait: Downcast) to Rc<Any>, which can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait.
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Converts &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s.
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where T: Any + Send,

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Converts Box<Trait> (where Trait: DowncastSend) to Box<dyn Any + Send>, which can then be downcast into Box<ConcreteType> where ConcreteType implements Trait.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> FromWorld for T
where T: Default,

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fn from_world(_world: &mut World) -> T

Creates Self using default().

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impl<T> Instrument for T

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fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoResult<T> for T

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fn into_result(self) -> Result<T, RunSystemError>

Converts this type into the system output type.
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impl<A> Is for A
where A: Any,

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fn is<T>() -> bool
where T: Any,

Checks if the current type “is” another type, using a TypeId equality comparison. This is most useful in the context of generic logic. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> ConditionalSend for T
where T: Send,