Enum Delta

pub enum Delta<T> {
    Unchanged,
    Added(T),
    Removed(T),
    Changed(ChangedType<T>),
}

Represents how a value changed.

This is used for statediff.

Variants

Unchanged

Existing value didn’t change.

Added(T)

New storage value added.

Removed(T)

Existing storage value removed.

Changed(ChangedType<T>)

Existing storage value changed.

Implementations

impl<T> Delta<T>

pub const fn changed(from: T, to: T) -> Self

Creates a new Delta::Changed variant

pub const fn is_unchanged(&self) -> bool

Returns true if the value is unchanged

pub const fn is_added(&self) -> bool

Returns true if the value is added

pub const fn is_removed(&self) -> bool

Returns true if the value is removed

pub const fn is_changed(&self) -> bool

Returns true if the value is changed

Trait Implementations

impl<T: Clone> Clone for Delta<T>

fn clone(&self) -> Delta<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Delta<T>

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

Formats the value using the given formatter.

impl<T> Default for Delta<T>

fn default() -> Delta<T>

Returns the “default value” for a type.

impl<'de, T> Deserialize<'de> for Delta<T>

where T: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T: PartialEq> PartialEq for Delta<T>

fn eq(&self, other: &Delta<T>) -> 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<T> Serialize for Delta<T>

where T: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl<T: Eq> Eq for Delta<T>

impl<T> StructuralPartialEq for Delta<T>