[−][src]Struct tract_nnef::internal::tract_downcast_rs::__std::lazy::SyncLazy
🔬 This is a nightly-only experimental API. (
once_cell
)A value which is initialized on the first access.
This type is a thread-safe Lazy
, and can be used in statics.
Examples
#![feature(once_cell)] use std::collections::HashMap; use std::lazy::SyncLazy; static HASHMAP: SyncLazy<HashMap<i32, String>> = SyncLazy::new(|| { println!("initializing"); let mut m = HashMap::new(); m.insert(13, "Spica".to_string()); m.insert(74, "Hoyten".to_string()); m }); fn main() { println!("ready"); std::thread::spawn(|| { println!("{:?}", HASHMAP.get(&13)); }).join().unwrap(); println!("{:?}", HASHMAP.get(&74)); // Prints: // ready // initializing // Some("Spica") // Some("Hoyten") }
Implementations
impl<T, F> SyncLazy<T, F>
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pub const fn new(f: F) -> SyncLazy<T, F>
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🔬 This is a nightly-only experimental API. (
once_cell
)Creates a new lazy value with the given initializing function.
impl<T, F> SyncLazy<T, F> where
F: FnOnce() -> T,
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F: FnOnce() -> T,
pub fn force(this: &SyncLazy<T, F>) -> &TⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
🔬 This is a nightly-only experimental API. (
once_cell
)Forces the evaluation of this lazy value and
returns a reference to result. This is equivalent
to the Deref
impl, but is explicit.
Examples
#![feature(once_cell)] use std::lazy::SyncLazy; let lazy = SyncLazy::new(|| 92); assert_eq!(SyncLazy::force(&lazy), &92); assert_eq!(&*lazy, &92);
Trait Implementations
impl<T, F> Debug for SyncLazy<T, F> where
T: Debug,
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T: Debug,
impl<T> Default for SyncLazy<T, fn() -> T> where
T: Default,
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T: Default,
fn default() -> SyncLazy<T, fn() -> T>
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Creates a new lazy value using Default
as the initializing function.
impl<T, F> Deref for SyncLazy<T, F> where
F: FnOnce() -> T,
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F: FnOnce() -> T,
type Target = T
The resulting type after dereferencing.
fn deref(&self) -> &TⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
impl<T, F> RefUnwindSafe for SyncLazy<T, F> where
F: UnwindSafe,
SyncOnceCell<T>: RefUnwindSafe,
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F: UnwindSafe,
SyncOnceCell<T>: RefUnwindSafe,
impl<T, F> Sync for SyncLazy<T, F> where
F: Send,
SyncOnceCell<T>: Sync,
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F: Send,
SyncOnceCell<T>: Sync,
impl<T, F> UnwindSafe for SyncLazy<T, F> where
F: UnwindSafe,
SyncOnceCell<T>: UnwindSafe,
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F: UnwindSafe,
SyncOnceCell<T>: UnwindSafe,
Auto Trait Implementations
impl<T, F> Send for SyncLazy<T, F> where
F: Send,
T: Send,
F: Send,
T: Send,
impl<T, F> Unpin for SyncLazy<T, F> where
F: Unpin,
T: Unpin,
F: Unpin,
T: Unpin,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow(&self) -> &TⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut TⓘNotable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
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Notable traits for &'_ mut W
impl<'_, W> Write for &'_ mut W where
W: Write + ?Sized, impl<'_, R> Read for &'_ mut R where
R: Read + ?Sized, impl<'_, I> Iterator for &'_ mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'_, F> Future for &'_ mut F where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;
impl<T> Downcast for T where
T: Any,
T: Any,
fn into_any(self: Box<T>) -> Box<dyn Any + 'static>ⓘNotable traits for Box<W>
impl<W> Write for Box<W> where
W: Write + ?Sized, impl<R> Read for Box<R> where
R: Read + ?Sized, impl<F> Future for Box<F> where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<I> Iterator for Box<I> where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
Notable traits for Box<W>
impl<W> Write for Box<W> where
W: Write + ?Sized, impl<R> Read for Box<R> where
R: Read + ?Sized, impl<F> Future for Box<F> where
F: Unpin + Future + ?Sized, type Output = <F as Future>::Output;impl<I> Iterator for Box<I> where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
fn as_any(&self) -> &(dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
impl<T> DowncastSync for T where
T: Send + Sync + Any,
T: Send + Sync + Any,
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,