Struct Cow

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pub struct Cow<'a, T> { /* private fields */ }
Expand description

A pointer-sized object that holds either a borrow (&'a T) or a boxed value (Box<T>).

TODO doc: implements deref, construction, ToOwned, etc.

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Because it uses PointerValuePair internally, T cannot not be a zero-sized type.

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impl<'a, T> Cow<'a, T>

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pub fn borrowed(v: &'a T) -> Cow<'a, T>

Creates a new Cow representing a borrowed value.

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pub fn owned(v: Box<T>) -> Cow<'a, T>

Creates a new Cow holding a boxed value.

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impl<'a, T> Cow<'a, T>
where T: Clone,

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pub fn into_owned(self) -> Box<T>

Converts this Cow into a Box<T>. If this Cow is a borrow, clones the value and boxes it.

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pub fn into_owned_cow<'b>(self) -> Cow<'b, T>

Converts this Cow into an owned Cow by cloning the value and boxing it, if it is borrowed.

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impl<'a, T> Deref for Cow<'a, T>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &Self::Target

Dereferences the value.
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impl<'a, T> Drop for Cow<'a, T>

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fn drop(&mut self)

Executes the destructor for this type. Read more

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impl<'a, T> Freeze for Cow<'a, T>

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impl<'a, T> RefUnwindSafe for Cow<'a, T>
where T: RefUnwindSafe,

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impl<'a, T> Send for Cow<'a, T>
where T: Send + Sync,

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impl<'a, T> Sync for Cow<'a, T>
where T: Sync,

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impl<'a, T> Unpin for Cow<'a, T>
where T: Unpin,

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impl<'a, T> UnwindSafe for Cow<'a, T>

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

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type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
The target type on which the method may be called.
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.