Trait OptionalNullable 

pub trait OptionalNullable: Default {
    type Target;

    // Required methods
    fn is_absent(&self) -> bool;
    fn null() -> Self;
    fn value(value: Self::Target) -> Self;
}

Models a fields that may be absent, null, or a value.

Default is required; it constructs the absent state.

Required Associated Types

type Target

The type for the value when present and non-null.

Required Methods

fn is_absent(&self) -> bool

Returns true if the instance represents an absent value.

fn null() -> Self

Construct a null.

fn value(value: Self::Target) -> Self

Construct a value.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<T> OptionalNullable for Option<Option<T>>

type Target = T

fn is_absent(&self) -> bool

fn null() -> Self

fn value(value: Self::Target) -> Self

Implementors