pub struct OccupiedEntry<'a, K, V: Serial, S: HasStateApi> { /* private fields */ }
Expand description
A view into an occupied entry in a StateMap
. It can be obtained via the
StateMap::entry
method. This allows looking up or modifying the value at
a give key in-place.
The type implements DerefMut
which allows the
value to be mutated. The Drop
implementation ensures
that the value is properly stored in the contract state maintained by the
node.
This differs from OccupiedEntryRaw
in that this automatically handles
serialization and provides convenience methods for modifying the value via
the DerefMut
implementation.
Get a reference to the key that is associated with this entry.
Get an immutable reference to the value contained in this entry.
Modify the value in the entry, and possibly return
some information.
Like modify
, but allows the closure to signal failure,
aborting the update.
The resulting type after dereferencing.
Dereferences the value.
Mutably dereferences the value.
Executes the destructor for this type.
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Immutably borrows from an owned value.
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Mutably borrows from an owned value.
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Returns the argument unchanged.
Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From<T> for U
chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.