Struct NONE

pub struct NONE<T>(/* private fields */);

Usable to do [None::<T>; LEN] when T is non-Copy.

As of Rust 1.51.0, [None::<T>; LEN] is not valid for non-Copy types, but [CONST; LEN] does work, like in the example below.

Example

use konst::option::NONE;

use std::mem::{self, MaybeUninit};

const TEN: [Option<String>; 10] = [NONE::V; 10];

let ten = [NONE::<String>::V; 10];

// the `vec` macro only needs `Option<String>` to be clonable, not Copy.
assert_eq!(vec![None::<String>; 10], TEN);

assert_eq!(vec![None::<String>; 10], ten);

Implementations

impl<T> NONE<T>

pub const V: Option<T> = None

The value that this constructs.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 0 bytes