linearize 0.1.6

Types that are enumerable and an array-backed map
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34

use {crate::Linearize, core::convert::Infallible};

// SAFETY:
// - Storage and CopyStorage have the required type.
// - linearize and from_linear_unchecked behave as required.
unsafe impl Linearize for Infallible {
    type Storage<T> = [T; Self::LENGTH];
    type CopyStorage<T>
        = [T; Self::LENGTH]
    where
        T: Copy;
    const LENGTH: usize = 0;

    #[inline]
    fn linearize(&self) -> usize {
        unsafe {
            // SAFETY: Infallible is uninhabited.
            cold_unreachable!();
        }
    }

    #[inline]
    unsafe fn from_linear_unchecked(_linear: usize) -> Self
    where
        Self: Sized,
    {
        unsafe {
            // SAFETY: It's a precondition that _linear < Self::LENGTH = 0.
            cold_unreachable!();
        }
    }
}

impl_assert!(Infallible, 0);