smallvec 2.0.0-beta.5

'Small vector' optimization: store up to a small number of items on the stack
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
35

use {
    super::SmallVec,
    alloc::alloc::Global,
    zerocopy::{
        FromZeros,
        Immutable,
        Maybe,
        TryFromBytes,
        invariant::Alignment
    }
};

#[cfg_attr(docsrs, doc(cfg(feature = "zerocopy")))]
unsafe impl<Item, const INLINE: usize> TryFromBytes for SmallVec<Item, INLINE, Global> {
    fn only_derive_is_allowed_to_implement_this_trait() {}

    #[inline]
    fn is_safe<Align>(_candidate: Maybe<'_, Self, Align>) -> bool
    where Align: Alignment {
        // Disallow arbitrary byte reads; only `FromZeros::new_zeroed()` is
        // supported.
        false
    }
}

#[cfg_attr(docsrs, doc(cfg(feature = "zerocopy")))]
unsafe impl<Item, const INLINE: usize> FromZeros for SmallVec<Item, INLINE, Global> {
    fn only_derive_is_allowed_to_implement_this_trait() {}
}

// Items may be stored inline, so `Item` must be `Immutable` too.
#[cfg_attr(docsrs, doc(cfg(feature = "zerocopy")))]
unsafe impl<Item: Immutable, const INLINE: usize> Immutable for SmallVec<Item, INLINE, Global> {
    fn only_derive_is_allowed_to_implement_this_trait() {}
}