Struct cw_storage_plus::Map

pub struct Map<'a, K, T> { /* fields omitted */ }

Implementations

impl<'a, K, T> Map<'a, K, T>

pub const fn new(namespace: &'a str) -> Self

impl<'a, K, T> Map<'a, K, T> where
    T: Serialize + DeserializeOwned,
    K: PrimaryKey<'a>, 

pub fn key(&self, k: K) -> Path<T>

pub fn prefix(&self, p: K::Prefix) -> Prefix<T>

pub fn sub_prefix(&self, p: K::SubPrefix) -> Prefix<T>

pub fn save(&self, store: &mut dyn Storage, k: K, data: &T) -> StdResult<()>

pub fn remove(&self, store: &mut dyn Storage, k: K)

pub fn load(&self, store: &dyn Storage, k: K) -> StdResult<T>

load will return an error if no data is set at the given key, or on parse error

pub fn may_load(&self, store: &dyn Storage, k: K) -> StdResult<Option<T>>

may_load will parse the data stored at the key if present, returns Ok(None) if no data there. returns an error on issues parsing

pub fn has(&self, store: &dyn Storage, k: K) -> bool

has returns true or false if any data is at this key, without parsing or interpreting the contents.

pub fn update<A, E>(
    &self,
    store: &mut dyn Storage,
    k: K,
    action: A
) -> Result<T, E> where
    A: FnOnce(Option<T>) -> Result<T, E>,
    E: From<StdError>, 

Loads the data, perform the specified action, and store the result in the database. This is shorthand for some common sequences, which may be useful.

If the data exists, action(Some(value)) is called. Otherwise action(None) is called.

impl<'a, K, T> Map<'a, K, T> where
    T: Serialize + DeserializeOwned,
    K: PrimaryKey<'a>,
    K::SubPrefix: EmptyPrefix, 

pub fn range<'c>(
    &self,
    store: &'c dyn Storage,
    min: Option<Bound>,
    max: Option<Bound>,
    order: Order
) -> Box<dyn Iterator<Item = StdResult<Pair<T>>> + 'c> where
    T: 'c, 

pub fn keys<'c>(
    &self,
    store: &'c dyn Storage,
    min: Option<Bound>,
    max: Option<Bound>,
    order: Order
) -> Box<dyn Iterator<Item = Vec<u8>> + 'c> where
    T: 'c, 

Trait Implementations

impl<'a, K: Clone, T: Clone> Clone for Map<'a, K, T>

fn clone(&self) -> Map<'a, K, T>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a, K: Debug, T: Debug> Debug for Map<'a, K, T>

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

Formats the value using the given formatter.