[−][src]Struct once_cell::unsync::Lazy
A value which is initialized on the first access.
Example
use once_cell::unsync::Lazy; let lazy: Lazy<i32> = Lazy::new(|| { println!("initializing"); 92 }); println!("ready"); println!("{}", *lazy); println!("{}", *lazy); // Prints: // ready // initializing // 92 // 92
Methods
impl<T, F: Fn() -> T> Lazy<T, F>
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pub fn new(init: F) -> Lazy<T, F>
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Creates a new lazy value with the given initializing function.
pub fn force(this: &Lazy<T, F>) -> &T
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Forces the evaluation of this lazy value and
returns a reference to result. This is equivalent
to the Deref
impl, but is explicit.
Example
use once_cell::unsync::Lazy; let lazy = Lazy::new(|| 92); assert_eq!(Lazy::force(&lazy), &92); assert_eq!(&*lazy, &92);
Trait Implementations
impl<T, F: Fn() -> T> Deref for Lazy<T, F>
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impl<T: Debug, F: Debug + Fn() -> T> Debug for Lazy<T, F>
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Auto Trait Implementations
Blanket Implementations
impl<T, U> Into for T where
U: From<T>,
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U: From<T>,
impl<T> From for T
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impl<T, U> TryFrom for T where
U: Into<T>,
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U: Into<T>,
type Error = !
🔬 This is a nightly-only experimental API. (
try_from
)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> Borrow for T where
T: ?Sized,
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T: ?Sized,
impl<T, U> TryInto for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
🔬 This is a nightly-only experimental API. (
try_from
)The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> BorrowMut for T where
T: ?Sized,
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T: ?Sized,