Trait enum_ptr::Aligned

pub unsafe trait Aligned {
    const ALIGNMENT: usize;
}

Types (may not be pointers) that can be used in EnumPtr.

Safety

• T must be exactly one-pointer wide.
• T’s pointee must be aligned by ALIGNMENT (T’s low bits are zeros).

For example, raw pointers are not guaranteed to be aligned, so implementing this trait for them is unsound.

Examples

use enum_ptr::{Aligned, Compact, EnumPtr};

// It's your responsibility to ensure `MyPtr` is always aligned.
struct MyPtr<T>(*const T);

unsafe impl<T> Aligned for MyPtr<T> {
    const ALIGNMENT: usize = std::mem::align_of::<T>();
}

#[derive(EnumPtr)]
#[repr(C, usize)]
enum Foo {
    A(MyPtr<i64>),
    B(MyPtr<u64>),
}

Required Associated Constants

const ALIGNMENT: usize

Implementations on Foreign Types

impl<T> Aligned for Option<Rc<T>>

It makes assumption on the layout of Rc. Use it with caution.

const ALIGNMENT: usize = _

impl<T> Aligned for Arc<T>

It makes assumption on the layout of Arc. Use it with caution.

const ALIGNMENT: usize = _

impl<T> Aligned for &mut T

const ALIGNMENT: usize = _

impl<T> Aligned for Option<&T>

const ALIGNMENT: usize = _

impl<T> Aligned for Option<Arc<T>>

It makes assumption on the layout of Arc. Use it with caution.

const ALIGNMENT: usize = _

impl<T> Aligned for Box<T>

const ALIGNMENT: usize = _

impl<T> Aligned for Option<Box<T>>

const ALIGNMENT: usize = _

impl<T> Aligned for Option<&mut T>

const ALIGNMENT: usize = _

impl<T> Aligned for Rc<T>

It makes assumption on the layout of Rc. Use it with caution.

const ALIGNMENT: usize = _

impl<T> Aligned for &T

const ALIGNMENT: usize = _

Implementors

impl Aligned for Unit

const ALIGNMENT: usize = 4_294_967_295usize

impl<const N: isize> Aligned for ShiftIsize<N>

const ALIGNMENT: usize = _

impl<const N: usize> Aligned for ShiftUsize<N>

const ALIGNMENT: usize = _