Enum OptionChanges 

pub enum OptionChanges<C: ChangeReport> {
    Unchanged,
    BecameSome,
    BecameNone,
    Inner(C),
}

Change report for Option<T> fields.

Tracks whether the option presence changed and preserves inner change information.

Variants

Unchanged

No change occurred.

BecameSome

Changed from None to Some (value was added).

BecameNone

Changed from Some to None (value was removed).

Inner(C)

Both were Some, contains the inner changes.

Implementations

impl<C: ChangeReport> OptionChanges<C>

pub fn became_some(&self) -> bool

Returns true if the option became Some (was None before).

pub fn became_none(&self) -> bool

Returns true if the option became None (was Some before).

pub fn inner(&self) -> Option<&C>

Returns the inner changes if both values were Some.

Trait Implementations

impl<C: ChangeReport> ChangeReport for OptionChanges<C>

fn any(&self) -> bool

Returns true if any field in this report (or nested reports) changed.

fn paths(&self) -> Vec<Vec<Cow<'static, str>>>

Collects all changed field paths as strings.

fn leaf_paths(&self) -> Vec<Vec<Cow<'static, str>>>

Collects only the leaf (deepest) changed field paths.

fn none(&self) -> bool

Returns true if no fields changed.

impl<C: Clone + ChangeReport> Clone for OptionChanges<C>

fn clone(&self) -> OptionChanges<C>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<C: Debug + ChangeReport> Debug for OptionChanges<C>

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

Formats the value using the given formatter.

impl<C: ChangeReport> Default for OptionChanges<C>

fn default() -> OptionChanges<C>

Returns the “default value” for a type.