Struct FileColorOutputPersistence 

pub struct FileColorOutputPersistence { /* private fields */ }

A file holding one colour object’s Present_Value, replaced whole on each save the same way as FileNotificationClassPersistence: a failed save leaves the previous value in place, and a completed one survives a power loss.

The file holds a magic tag, the object’s identifier, one octet naming the kind of value, and the value: two big-endian REALs for an xy colour, a big-endian 32-bit kelvin for a temperature. A file of the wrong size, of the other kind, or with a value outside the object’s range, does not load. It does not coordinate between processes.

Implementations

impl FileColorOutputPersistence

pub fn new(path: impl AsRef<Path>) -> Result<Self, Error>

Keep the Present_Value in the file at path. Refuses an empty path.

pub fn path(&self) -> &Path

The file the Present_Value is kept in.

Trait Implementations

impl Clone for FileColorOutputPersistence

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl ColorOutputPersistence for FileColorOutputPersistence

Available on crate feature std only.

fn load( &self, object: ObjectIdentifier, ) -> Result<Option<ColorOutputSnapshot>, Error>

What was last saved for object, or None when nothing was saved.

fn save( &self, object: ObjectIdentifier, snapshot: &ColorOutputSnapshot, ) -> Result<(), Error>

Durably replace what is saved for object with snapshot.

impl Debug for FileColorOutputPersistence

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

Formats the value using the given formatter.