Trait fefast::FieldOperator

pub trait FieldOperator {
    type Item: Codec;
    fn previous_value(&self) -> Option<&Self::Item>;
    fn replace(&mut self, new_value: Self::Item);
    fn can_omit(&self, value: &Self::Item) -> bool;
    fn reset(&mut self);
}

Field encoding operator in FAST terminology.

Associated Types

type Item: Codec

The type of the (de)serializable item.

Required methods

fn previous_value(&self) -> Option<&Self::Item>

See section 6.3.1 of FAST 1.1 documentation.

fn replace(&mut self, new_value: Self::Item)

Replace the previous value (or set it if unset) with a new one.

fn can_omit(&self, value: &Self::Item) -> bool

Determine whether the specified value can be omitted from the final payload. This behavior is custom to every field operator.

fn reset(&mut self)

Unset previous state.

Implementors

impl<T> FieldOperator for Constant<T> where
    T: Codec, 

impl<T> FieldOperator for Copy<T> where
    T: Codec + PartialEq + Copy, 

impl<T> FieldOperator for None<T> where
    T: Codec, 

impl<U, T> FieldOperator for Delta<T, U> where
    U: PartialEq,
    T: Codec + Sub<Output = U> + Copy,