Trait Nullable

pub trait Nullable:
    PartialEq
    + Pod
    + Sized {
    const NONE: Self;

    // Provided methods
    fn is_none(&self) -> bool { ... }
    fn is_some(&self) -> bool { ... }
}

Trait for types that can be None.

This trait is used to indicate that a type can be None according to a specific value.

Required Associated Constants

const NONE: Self

Value that represents None for the type.

Provided Methods

fn is_none(&self) -> bool

Indicates whether the value is None or not.

fn is_some(&self) -> bool

Indicates whether the value is Some`` value of type T`` or not.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl Nullable for Pubkey

Implementation of Nullable for Pubkey.

const NONE: Self = _

Implementors