Struct UNINIT

pub struct UNINIT<T>(/* private fields */);

Generic constant for an uninitialized MaybeUninit<T>. Usable to safely construct a [MaybeUninit<T>; LEN] when T is non-Copy.

As of Rust 1.51.0, [MaybeUninit::uninit(); LEN] is not valid for non-Copy types, but [CONST; LEN] does work, like in the example below.

Example

use konst::maybe_uninit::UNINIT;

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

// Intentionally doesn't implement `Copy`
#[derive(Debug, PartialEq, Eq, Clone)]
struct NonCopy(u8);

const INITS: [NonCopy; 5] = {
    let mut uninits = [UNINIT::<NonCopy>::V; 5];
    konst::for_range!{i in 0..5=>
        uninits[i] = MaybeUninit::new(NonCopy(i as u8 * 3));
    }
    unsafe{ mem::transmute(uninits) }
};

assert_eq!(INITS, [NonCopy(0), NonCopy(3), NonCopy(6), NonCopy(9), NonCopy(12)]);

Implementations

impl<T> UNINIT<T>

pub const V: MaybeUninit<T>

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