[−][src]Struct lazy_init::LazyTransform
LazyTransform<T, U>
is a synchronized holder type, that holds a value of
type T until it is lazily converted into a value of type U.
Implementations
impl<T, U> LazyTransform<T, U>
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pub fn new(t: T) -> LazyTransform<T, U>
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Construct a new, untransformed LazyTransform<T, U>
with an argument of
type T.
pub fn into_inner(self) -> Result<U, T>
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Unwrap the contained value, returning Ok(U)
if the LazyTransform<T, U>
has been
transformed or Err(T)
if it has not.
impl<T, U> LazyTransform<T, U>
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pub fn get_or_create<F>(&self, f: F) -> &U where
F: FnOnce(T) -> U,
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F: FnOnce(T) -> U,
Get a reference to the transformed value, invoking f
to transform it
if the LazyTransform<T, U>
has yet to be transformed. It is
guaranteed that if multiple calls to get_or_create
race, only one
will invoke its closure, and every call will receive a reference to the
newly transformed value.
The closure can only ever be called once, so think carefully about what transformation you want to apply!
pub fn get(&self) -> Option<&U>
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Get a reference to the transformed value, returning Some(&U)
if the
LazyTransform<T, U>
has been transformed or None
if it has not. It
is guaranteed that if a reference is returned it is to the transformed
value inside the the LazyTransform<T>
.
Trait Implementations
impl<T, U> Clone for LazyTransform<T, U> where
T: Clone,
U: Clone,
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T: Clone,
U: Clone,
pub fn clone(&self) -> Self
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pub fn clone_from(&mut self, source: &Self)
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impl<T, U> Default for LazyTransform<T, U> where
T: Default,
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T: Default,
impl<T, U> Sync for LazyTransform<T, U> where
T: Send,
U: Send + Sync,
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T: Send,
U: Send + Sync,
Auto Trait Implementations
impl<T, U> !RefUnwindSafe for LazyTransform<T, U>
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impl<T, U> Send for LazyTransform<T, U> where
T: Send,
U: Send,
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T: Send,
U: Send,
impl<T, U> Unpin for LazyTransform<T, U> where
T: Unpin,
U: Unpin,
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T: Unpin,
U: Unpin,
impl<T, U> UnwindSafe for LazyTransform<T, U> where
T: UnwindSafe,
U: UnwindSafe,
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T: UnwindSafe,
U: UnwindSafe,
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,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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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> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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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.
pub 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>,