Struct ValueMut 

pub struct ValueMut<'a, T: WriteXDR> { /* private fields */ }

Mutable view into a Value<T>. Flushes T back to storage on drop if it was mutated (accessed through DerefMut) since the last flush; a guard that was only read writes nothing.

Implementations

impl<T: WriteXDR> ValueMut<'_, T>

pub fn flush(&mut self)

Write the value back to storage now instead of waiting for drop.

A guard that has not been mutated (no DerefMut access) since the last flush is a no-op. After a flush the guard remains usable; mutating it again re-arms the drop-time writeback.

pub fn try_flush(&mut self) -> Result<(), LibraryExn>

Like flush, but report failure as Err instead of aborting (the try_ law; see the exn module docs) — in particular, the only way to catch an error the drop-time writeback would abort with. The Err is exactly Value::try_set’s. On Err the guard still holds the value as dirty: drop re-attempts the writeback and aborts if it still fails, so a caught error cannot silently lose the write.

Trait Implementations

impl<T: WriteXDR> Deref for ValueMut<'_, T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &T

Dereferences the value.

impl<T: WriteXDR> DerefMut for ValueMut<'_, T>

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

Mutably dereferences the value.

impl<T: WriteXDR> Drop for ValueMut<'_, T>

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.