Enum Update 

pub enum Update<T> {
    Keep,
    Clear,
    Set(T),
}

The type of update to perform on the given property.

Variants

Keep

Keep the previous value of the property.

Clear

Clear the value of the property.

Set(T)

Change the value of the property.

Trait Implementations

impl<T> Default for Update<T>

fn default() -> Update<T>

Returns the “default value” for a type.

impl<T: Serialize> Serialize for Update<T>

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.