Struct cw_storage_plus::Item[][src]

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

Item stores one typed item at the given key. This is an analog of Singleton. It functions just as Path but doesn’t ue a Vec and thus has a const fn constructor.

Implementations

impl<'a, T> Item<'a, T>[src]

pub const fn new(storage_key: &'a str) -> Self[src]

impl<'a, T> Item<'a, T> where
    T: Serialize + DeserializeOwned
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pub fn as_slice(&self) -> &[u8]

Notable traits for &'_ [u8]

impl<'_> Read for &'_ [u8]impl<'_> Write for &'_ mut [u8]
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pub fn save(&self, store: &mut dyn Storage, data: &T) -> StdResult<()>[src]

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

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

pub fn load(&self, store: &dyn Storage) -> StdResult<T>[src]

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>>[src]

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 update<A, E>(&self, store: &mut dyn Storage, action: A) -> Result<T, E> where
    A: FnOnce(T) -> Result<T, E>,
    E: From<StdError>, 
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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.

Auto Trait Implementations

impl<'a, T> RefUnwindSafe for Item<'a, T> where
    T: RefUnwindSafe

impl<'a, T> Send for Item<'a, T> where
    T: Send

impl<'a, T> Sync for Item<'a, T> where
    T: Sync

impl<'a, T> Unpin for Item<'a, T> where
    T: Unpin

impl<'a, T> UnwindSafe for Item<'a, T> where
    T: UnwindSafe

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> Conv for T

impl<T> FmtForward for T

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> Pipe for T

impl<T> PipeAsRef for T

impl<T> PipeBorrow for T

impl<T> PipeDeref for T

impl<T> PipeRef for T

impl<T> Same<T> for T

type Output = T

Should always be Self

impl<T> Tap for T

impl<T, U> TapAsRef<U> for T where
    U: ?Sized

impl<T, U> TapBorrow<U> for T where
    U: ?Sized

impl<T> TapDeref for T

impl<T> TryConv for T

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.