Struct dharitri_wasm::storage::mappers::SingleValueMapper

pub struct SingleValueMapper<SA, T>
where
    SA: StorageReadApi + StorageWriteApi + ErrorApi + Clone + 'static,
    T: TopEncode + TopDecode + 'static,
{ /* private fields */ }

Manages a single serializable item in storage.

Implementations

impl<SA, T> SingleValueMapper<SA, T>

where SA: StorageReadApi + StorageWriteApi + ErrorApi + Clone + 'static, T: TopEncode + TopDecode,

pub fn get(&self) -> T

Retrieves current value from storage.

pub fn set(&self, new_value: &T)

Saves argument to storage.

pub fn is_empty(&self) -> bool

Returns whether the storage managed by this is empty

pub fn clear(&self)

Clears the storage for this mapper

pub fn update<F: FnOnce(&mut T)>(&self, f: F)

Syntactic sugar, to more compactly express a get, update and set in one line. Takes whatever lies in storage, apples the given closure and saves the final value back to storage.

Trait Implementations

impl<SA, FA, T> EndpointResult<FA> for SingleValueMapper<SA, T>

where SA: StorageReadApi + StorageWriteApi + ErrorApi + Clone + 'static, FA: EndpointFinishApi + 'static, T: TopEncode + TopDecode + EndpointResult<FA>,

fn finish(&self, api: FA)

impl<SA, T> StorageMapper<SA> for SingleValueMapper<SA, T>

where SA: StorageReadApi + StorageWriteApi + ErrorApi + Clone + 'static, T: TopEncode + TopDecode,

fn new(api: SA, key: BoxedBytes) -> Self

Will be called automatically by the #[storage_mapper] annotation generated code.

impl<SA, T> TypeAbi for SingleValueMapper<SA, T>

where SA: StorageReadApi + StorageWriteApi + ErrorApi + Clone + 'static, T: TopEncode + TopDecode + TypeAbi,

fn type_name() -> TypeName

fn provide_type_descriptions<TDC: TypeDescriptionContainer>( accumulator: &mut TDC )

A type can provide more than its own description. For instance, a struct can also provide the descriptions of the type of its fields. TypeAbi doesn’t care for the exact accumulator type, which is abstracted by the TypeDescriptionContainer trait.