Trait specs::Accessor

pub trait Accessor {
    fn try_new() -> Option<Self>;
    fn reads(&self) -> Vec<ResourceId>;
    fn writes(&self) -> Vec<ResourceId>;
}

A trait for accessing read/write multiple resources from a system. This can be used to create dynamic systems that don't specify what they fetch at compile-time.

For compile-time system data this will all be done for you using StaticAccessor.

Required methods

fn try_new() -> Option<Self>

Tries to create a new instance of this type. This one returns Some in case there is a default, otherwise the system needs to override System::accessor.

fn reads(&self) -> Vec<ResourceId>

A list of ResourceIds the bundle needs read access to in order to build the target resource bundle.

Contract

Exactly return the dependencies you're going to fetch! Doing otherwise will cause a panic.

This method is only executed once, thus the returned value may never change (otherwise it has no effect).

fn writes(&self) -> Vec<ResourceId>

A list of ResourceIds the bundle needs write access to in order to build the target resource bundle.

Contract

Exactly return the dependencies you're going to fetch! Doing otherwise will cause a panic.

This method is only executed once, thus the returned value may never change (otherwise it has no effect).

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Implementations on Foreign Types

impl<T> Accessor for PhantomData<T> where
    T: ?Sized, 

fn try_new() -> Option<PhantomData<T>>

fn reads(&self) -> Vec<ResourceId>

fn writes(&self) -> Vec<ResourceId>

impl Accessor for ()

fn try_new() -> Option<()>

fn reads(&self) -> Vec<ResourceId>

fn writes(&self) -> Vec<ResourceId>

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Implementors

impl Accessor for BatchAccessor

fn try_new() -> Option<BatchAccessor>

fn reads(&self) -> Vec<ResourceId>

fn writes(&self) -> Vec<ResourceId>

impl<'a, T> Accessor for StaticAccessor<T> where
    T: SystemData<'a>, 

fn try_new() -> Option<StaticAccessor<T>>

fn reads(&self) -> Vec<ResourceId>

fn writes(&self) -> Vec<ResourceId>

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