Trait Access 

pub trait Access<T> {
    const IS_ABSENT: bool;

    // Required methods
    fn get(&self) -> Option<&T>;
    fn get_mut(&mut self) -> Option<&mut T>;
}

Trait for uniformly accessing fields that may be Present, Optional, or Absent.

Required Associated Constants

const IS_ABSENT: bool

Compile-time constant indicating if this field is absent.

Required Methods

fn get(&self) -> Option<&T>

Get a reference to the field value if present.

fn get_mut(&mut self) -> Option<&mut T>

Get a mutable reference to the field value if present.

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<T> Access<T> for Option<T>

const IS_ABSENT: bool = false

fn get(&self) -> Option<&T>

fn get_mut(&mut self) -> Option<&mut T>

impl<T> Access<T> for PhantomData<T>

const IS_ABSENT: bool = true

fn get(&self) -> Option<&T>

fn get_mut(&mut self) -> Option<&mut T>

Implementors

impl<T: Sized> Access<T> for T

const IS_ABSENT: bool = false