Trait AccumulateOps 

pub trait AccumulateOps {
    type Error: Debug;

    // Required methods
    fn get(&self, key: &StorageKey) -> Option<Cow<'_, [u8]>>;
    fn set(
        &mut self,
        key: StorageKey,
        value: Cow<'_, [u8]>,
    ) -> Result<(), Self::Error>;
    fn remove(&mut self, key: &StorageKey);

    // Provided methods
    fn set_typed(
        &mut self,
        key: StorageKey,
        value: &impl Encode,
    ) -> Result<(), Self::Error> { ... }
    fn get_typed<T: Decode>(&self, key: &StorageKey) -> Result<Option<T>, Error> { ... }
}

Operations that AccumulateEngine uses during accumulation.

Each operation corresponds to a JAM host-call.

Required Associated Types

type Error: Debug

Implemenatation-specific error type.

Required Methods

fn get(&self, key: &StorageKey) -> Option<Cow<'_, [u8]>>

Read value under the specified key from the storage.

fn set( &mut self, key: StorageKey, value: Cow<'_, [u8]>, ) -> Result<(), Self::Error>

Write value under the specified key to the storage.

fn remove(&mut self, key: &StorageKey)

Read value under the specified key from the storage.

Provided Methods

fn set_typed( &mut self, key: StorageKey, value: &impl Encode, ) -> Result<(), Self::Error>

Same as set but encodes the provided value using JAM codec.

fn get_typed<T: Decode>(&self, key: &StorageKey) -> Result<Option<T>, Error>

Same as get but decodes the retrieved value using JAM codec.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<A: AccumulateOps + ?Sized> AccumulateOps for &mut A

type Error = <A as AccumulateOps>::Error

fn get(&self, key: &StorageKey) -> Option<Cow<'_, [u8]>>

fn set( &mut self, key: StorageKey, value: Cow<'_, [u8]>, ) -> Result<(), Self::Error>

fn remove(&mut self, key: &StorageKey)

Implementors