Struct EmptyBox

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pub struct EmptyBox<T> { /* private fields */ }
Expand description

An “emptied” Box. Constructed via EmptyBox::take(), an EmptyBox<T> is a Box from which the contents have been moved. This allows for reuse of the Box via EmptyBox::put(), which moves the contents back in, turning the EmptyBox back into a Box<T>.

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impl<T> EmptyBox<T>

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pub fn take(bx: Box<T>) -> (T, EmptyBox<T>)

Move the value out of the Box, creating a T and an EmptyBox which preserves the original Box’s allocation.

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pub fn put(self, t: T) -> Box<T>

Restore a value to an EmptyBox, creating a new Box and reusing the allocation of whatever Box was destroyed to create the EmptyBox.

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impl<T> Drop for EmptyBox<T>

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fn drop(&mut self)

Executes the destructor for this type. Read more

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impl<T> Freeze for EmptyBox<T>

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impl<T> RefUnwindSafe for EmptyBox<T>
where T: RefUnwindSafe,

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impl<T> !Send for EmptyBox<T>

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impl<T> !Sync for EmptyBox<T>

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impl<T> Unpin for EmptyBox<T>

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impl<T> UnwindSafe for EmptyBox<T>
where T: RefUnwindSafe,

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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<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.