Struct cw_storage_plus::Path

pub struct Path<T> where
    T: Serialize + DeserializeOwned,  { /* fields omitted */ }

Implementations

impl<T> Path<T> where
    T: Serialize + DeserializeOwned, 

pub fn new(namespace: &[u8], keys: &[&[u8]]) -> Self

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

save will serialize the model and store, returns an error on serialization issues

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

pub fn load(&self, store: &dyn Storage) -> 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) -> 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) -> bool

has returns true or false if any data is at this key, without parsing or interpreting the contents. It will returns true for an length-0 byte array (Some(b““)), if you somehow manage to set that.

pub fn update<A, E>(&self, store: &mut dyn Storage, 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.

Trait Implementations

impl<T: Clone> Clone for Path<T> where
    T: Serialize + DeserializeOwned, 

fn clone(&self) -> Path<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Path<T> where
    T: Serialize + DeserializeOwned, 

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

Formats the value using the given formatter.

impl<T> Deref for Path<T> where
    T: Serialize + DeserializeOwned, 

type Target = [u8]

The resulting type after dereferencing.

fn deref(&self) -> &[u8]

Dereferences the value.