Struct index_ext::tag::Const

pub struct Const<const N: usize>;

A tag using a const generic length parameter.

The only safe way to construct an ExactSize is by copying the associated constant which expresses the length indicated in the trait impl. This implies that the value is unique.

Usage

use index_ext::tag::{Const, Slice};

let size = Const::<8>::EXACT_SIZE;

let data = [0, 1, 2, 3, 4, 5, 6, 7];
let slice = Slice::new(&data[..], size).unwrap();

let prefix = size
    .into_len()
    .truncate(4)
    .range_to_self();

let prefix = &slice[prefix];
assert_eq!(prefix, [0, 1, 2, 3]);

Implementations

impl<const N: usize> Const<N>

pub const EXACT_SIZE: ExactSize<Self> = _

A constructed instance of ExactSize<Self>.

The instance can be freely copied. Making this an associated constant ensures that the length associated with the type is the constant parameter N. There are no other safe constructors for this tag’s ExactSize type.

pub fn with_ref<T>(self, arr: &[T; N]) -> &Slice<T, Self>

Create a Slice wrapping the array.

pub fn with_mut<T>(self, arr: &mut [T; N]) -> &mut Slice<T, Self>

Create a Slice wrapping the array mutably.

Trait Implementations

impl<const N: usize> Clone for Const<N>

fn clone(&self) -> Const<N>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<const N: usize> Copy for Const<N>

impl<const N: usize> Tag for Const<N>