Trait Index 

pub trait Index:
    Copy
    + Clone
    + Debug
    + Display
    + Into<usize>
    + PartialEq
    + Eq
    + PartialOrd
    + Ord
    + Send
    + Sync
    + Sized
    + 'static {
    const ZERO: Self;
    const MAX_USIZE: usize;

    // Required methods
    fn from_usize(val: usize) -> Self;
    fn try_from_usize(val: usize) -> Option<Self>;
    fn saturating_add(self, val: usize) -> Self;
    fn saturating_sub(self, val: usize) -> Self;
    fn saturating_mul(self, val: usize) -> Self;

    // Provided method
    fn to_usize(self) -> usize { ... }
}

Types which may be used to index and define the length and capacity of collections.

Required Associated Constants

const ZERO: Self

The zero value

const MAX_USIZE: usize

The maximum representable value of this type as a usize

Required Methods

fn from_usize(val: usize) -> Self

Create an instance of this type from a usize, panicking if the bounds are exceeded

fn try_from_usize(val: usize) -> Option<Self>

Try to create an instance of this type from a usize

fn saturating_add(self, val: usize) -> Self

Add a usize without exceeding the bounds of this type

fn saturating_sub(self, val: usize) -> Self

Subtract a usize without exceeding the bounds of this type

fn saturating_mul(self, val: usize) -> Self

Multiply by a usize without exceeding the bounds of this type

Provided Methods

fn to_usize(self) -> usize

Convert this instance into a usize

Dyn Compatibility

This trait is not dyn compatible.

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

Implementations on Foreign Types

impl Index for u8

const ZERO: Self = 0u8

const MAX_USIZE: usize

fn from_usize(val: usize) -> Self

fn try_from_usize(val: usize) -> Option<Self>

fn to_usize(self) -> usize

fn saturating_add(self, val: usize) -> Self

fn saturating_sub(self, val: usize) -> Self

fn saturating_mul(self, val: usize) -> Self

impl Index for usize

const ZERO: Self = 0usize

const MAX_USIZE: usize = usize::MAX

fn from_usize(val: usize) -> Self

fn try_from_usize(val: usize) -> Option<Self>

fn saturating_add(self, val: usize) -> Self

fn saturating_sub(self, val: usize) -> Self

fn saturating_mul(self, val: usize) -> Self

Implementors