pub struct ReadonlySingleton<'a, T>{ /* private fields */ }
👎Deprecated: The crate cosmwasm-storage is unmaintained and will be removed in CosmWasm 2.0. Please consider migrating to cw-storage-plus or simple cosmwasm-std storage calls.
Expand description

ReadonlySingleton only requires a Storage and exposes only the methods of Singleton that don’t modify state.

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impl<'a, T> ReadonlySingleton<'a, T>

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pub fn new(storage: &'a dyn Storage, key: &[u8]) -> Self

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pub fn load(&self) -> StdResult<T>

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

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pub fn may_load(&self) -> 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

Auto Trait Implementations§

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impl<'a, T> !RefUnwindSafe for ReadonlySingleton<'a, T>

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impl<'a, T> !Send for ReadonlySingleton<'a, T>

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impl<'a, T> !Sync for ReadonlySingleton<'a, T>

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

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impl<'a, T> !UnwindSafe for ReadonlySingleton<'a, T>

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<U> As for U

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fn as_<T>(self) -> T
where T: CastFrom<U>,

Casts self to type T. The semantics of numeric casting with the as operator are followed, so <T as As>::as_::<U> can be used in the same way as T as U for numeric conversions. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same for T

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type Output = T

Should always be Self
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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.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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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.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.