PrefixProber

rust_rocksdb

Struct PrefixProber 

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pub struct PrefixProber<'a, D: DBAccess> { /* private fields */ }
Expand description

A reusable prefix probe that avoids per-call iterator creation/destruction.

Use this when performing many prefix existence checks in a tight loop.

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impl<D: DBAccess> PrefixProber<'_, D>

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pub fn exists(&mut self, prefix: &[u8]) -> Result<bool, Error>

Returns true if any key exists with the given prefix. This performs a seek to the prefix and checks the current key.

Auto Trait Implementations§

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impl<'a, D> Freeze for PrefixProber<'a, D>

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impl<'a, D> RefUnwindSafe for PrefixProber<'a, D>
where D: RefUnwindSafe,

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impl<'a, D> Send for PrefixProber<'a, D>

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impl<'a, D> Sync for PrefixProber<'a, D>

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impl<'a, D> Unpin for PrefixProber<'a, D>

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impl<'a, D> UnwindSafe for PrefixProber<'a, D>
where D: 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.