Struct specs::prelude::Read [−][src]
pub struct Read<'a, T, F = DefaultProvider> where
T: 'a, { /* fields omitted */ }
Allows to fetch a resource in a system immutably.
If the resource isn't strictly required, you should use Option<Read<T>>
.
Type parameters
T
: The type of the resourceF
: The setup handler (default:DefaultProvider
)
Trait Implementations
impl<'a, T, F> SystemData<'a> for Read<'a, T, F> where
F: SetupHandler<T>,
T: Resource,
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impl<'a, T, F> SystemData<'a> for Read<'a, T, F> where
F: SetupHandler<T>,
T: Resource,
fn setup(res: &mut Resources)
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fn setup(res: &mut Resources)
Sets up the system data for fetching it from the Resources
.
fn fetch(res: &'a Resources) -> Read<'a, T, F>
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fn fetch(res: &'a Resources) -> Read<'a, T, F>
Fetches the system data from Resources
. Note that this is only specified for one concrete lifetime 'a
, you need to implement the SystemData
trait for every possible lifetime. Read more
fn reads() -> Vec<ResourceId>
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fn reads() -> Vec<ResourceId>
Returns all read dependencies as fetched from Self::fetch
. Read more
fn writes() -> Vec<ResourceId>
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fn writes() -> Vec<ResourceId>
Returns all write dependencies as fetched from Self::fetch
. Read more
impl<'a, T, F> Deref for Read<'a, T, F> where
T: Resource,
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impl<'a, T, F> Deref for Read<'a, T, F> where
T: Resource,
type Target = T
The resulting type after dereferencing.
ⓘImportant traits for &'a mut Rfn deref(&self) -> &T
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ⓘImportant traits for &'a mut R
fn deref(&self) -> &T
Dereferences the value.
impl<'a, T, F> From<Fetch<'a, T>> for Read<'a, T, F>
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impl<'a, T, F> From<Fetch<'a, T>> for Read<'a, T, F>