pub struct StorageValueRef<'a> { /* private fields */ }
Expand description

An abstraction over local storage value.

Implementations

Create a new reference to a value in the persistent local storage.

Create a new reference to a value in the fork-aware local storage.

Set the value of the storage to encoding of given parameter.

Note that the storage may be accessed by workers running concurrently, if you happen to write a get-check-set pattern you should most likely be using mutate instead.

Remove the associated value from the storage.

Retrieve & decode the value from storage.

Note that if you want to do some checks based on the value and write changes after that, you should rather be using mutate.

Returns the value if stored. Returns an error if the value could not be decoded.

Retrieve & decode the current value and set it to a new value atomically.

Function mutate_val takes as input the current value and should return a new value that is attempted to be written to storage.

This function returns:

  1. Ok(T) in case the value has been successfully set.
  2. Err(MutateStorageError::ConcurrentModification(T)) in case the value was calculated by the passed closure mutate_val, but it could not be stored.
  3. Err(MutateStorageError::ValueFunctionFailed(_)) in case mutate_val returns an error.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
Convert from a value of T into an equivalent instance of Option<Self>. Read more
Consume self to return Some equivalent value of Option<T>. Read more
Convert Box<dyn Trait> (where Trait: Downcast) to Box<dyn Any>. Box<dyn Any> can then be further downcast into Box<ConcreteType> where ConcreteType implements Trait. Read more
Convert Rc<Trait> (where Trait: Downcast) to Rc<Any>. Rc<Any> can then be further downcast into Rc<ConcreteType> where ConcreteType implements Trait. Read more
Convert &Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &Any’s vtable from &Trait’s. Read more
Convert &mut Trait (where Trait: Downcast) to &Any. This is needed since Rust cannot generate &mut Any’s vtable from &mut Trait’s. Read more
Convert Arc<Trait> (where Trait: Downcast) to Arc<Any>. Arc<Any> can then be further downcast into Arc<ConcreteType> where ConcreteType implements Trait. Read more

Returns the argument unchanged.

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
Instruments this type with the current Span, returning an Instrumented wrapper. Read more

Calls U::from(self).

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

Get a reference to the inner from the outer.

Get a mutable reference to the inner from the outer.

The alignment of pointer.
The type for initializers.
Initializes a with the given initializer. Read more
Dereferences the given pointer. Read more
Mutably dereferences the given pointer. Read more
Drops the object pointed to by the given pointer. Read more
Should always be Self
Convert from a value of T into an equivalent instance of Self. Read more
Consume self to return an equivalent value of T. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.
The counterpart to unchecked_from.
Consume self to return an equivalent value of T.
Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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