Trait Nullable

pub trait Nullable {
    const NULL: Self;

    // Required method
    fn is_null(&self) -> bool;
}

An object which has an “obviously invalid” value, for use with the null_pointer_check!() macro.

This trait is implemented for all integer types and raw pointers, returning 0 and null respectively.

Required Associated Constants

const NULL: Self

Required Methods

fn is_null(&self) -> bool

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 i8

const NULL: Self = 0i8

fn is_null(&self) -> bool

impl Nullable for i16

const NULL: Self = 0i16

fn is_null(&self) -> bool

impl Nullable for i32

const NULL: Self = 0i32

fn is_null(&self) -> bool

impl Nullable for i64

const NULL: Self = 0i64

fn is_null(&self) -> bool

impl Nullable for isize

const NULL: Self = 0isize

fn is_null(&self) -> bool

impl Nullable for u8

const NULL: Self = 0u8

fn is_null(&self) -> bool

impl Nullable for u16

const NULL: Self = 0u16

fn is_null(&self) -> bool

impl Nullable for u32

const NULL: Self = 0u32

fn is_null(&self) -> bool

impl Nullable for u64

const NULL: Self = 0u64

fn is_null(&self) -> bool

impl Nullable for ()

const NULL: Self = ()

fn is_null(&self) -> bool

impl Nullable for usize

const NULL: Self = 0usize

fn is_null(&self) -> bool

impl<T> Nullable for Option<T>

const NULL: Self = None

fn is_null(&self) -> bool

impl<T> Nullable for *const T

const NULL: Self

fn is_null(&self) -> bool

impl<T> Nullable for *mut T

const NULL: Self

fn is_null(&self) -> bool

Implementors