pub struct PoolGuard<'a, T: Send, F: Fn() -> T>(/* private fields */);
Expand description

A guard that is returned when a caller requests a value from the pool.

The purpose of the guard is to use RAII to automatically put the value back in the pool once it’s dropped.

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impl<'a, T: Send, F: Fn() -> T> PoolGuard<'a, T, F>

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pub fn put(this: PoolGuard<'_, T, F>)

Consumes this guard and puts it back into the pool.

This circumvents the guard’s Drop implementation. This can be useful in circumstances where the automatic Drop results in poorer codegen, such as calling non-inlined functions.

Trait Implementations§

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impl<'a, T: Send + Debug, F: Fn() -> T> Debug for PoolGuard<'a, T, F>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'a, T: Send, F: Fn() -> T> Deref for PoolGuard<'a, T, F>

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type Target = T

The resulting type after dereferencing.
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fn deref(&self) -> &T

Dereferences the value.
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impl<'a, T: Send, F: Fn() -> T> DerefMut for PoolGuard<'a, T, F>

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

Mutably dereferences the value.

Auto Trait Implementations§

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impl<'a, T, F> Freeze for PoolGuard<'a, T, F>

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impl<'a, T, F> RefUnwindSafe for PoolGuard<'a, T, F>

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

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

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impl<'a, T, F> Unpin for PoolGuard<'a, T, F>

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impl<'a, T, F> UnwindSafe for PoolGuard<'a, T, F>

Blanket Implementations§

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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.