Trait ffi_helpers::Nullable

pub trait Nullable {
    const NULL: Self;

    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.

Associated Constants

const NULL: Self

Required Methods

fn is_null(&self) -> bool

Implementations on Foreign Types

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

impl Nullable for u8

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for i8

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for u16

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for i16

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for u32

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for i32

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for u64

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for i64

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for usize

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for isize

const NULL: Self

fn is_null(&self) -> bool

impl<T> Nullable for Option<T>

const NULL: Self

fn is_null(&self) -> bool

impl Nullable for ()

const NULL: Self

fn is_null(&self) -> bool

Implementors