Enum MetadataChange 

pub enum MetadataChange {
    Added {
        key: String,
        value: String,
    },
    Removed {
        key: String,
        prev_value: String,
    },
    Updated {
        key: String,
        prev_value: String,
        new_value: String,
    },
}

One metadata-key change between two CapabilitySets.

Renamed keys surface as Removed { old_key } + Added { new_key }, not Updated, because key identity changes are semantically distinct from value changes.

Variants

Added

Key was not present in prev; now has value.

Fields

key: String

Metadata key.

value: String

New value.

Removed

Key was present in prev with prev_value; no longer in self.

Fields

key: String

Metadata key.

prev_value: String

Value held in the previous state.

Updated

Key present in both; value changed.

Fields

key: String

Metadata key.

prev_value: String

Value held in the previous state.

new_value: String

New value.

Trait Implementations

impl Clone for MetadataChange

fn clone(&self) -> MetadataChange

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MetadataChange

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

Formats the value using the given formatter.

impl PartialEq for MetadataChange

fn eq(&self, other: &MetadataChange) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for MetadataChange