Enum Annotation

pub enum Annotation {
    PragmaPack(u64),
    AttrPacked,
    Align(Option<u64>),
}

An annotation of a type or field.

Builtin types, arrays, and opaque types cannot be annotated.

Variants

PragmaPack(u64)

The PragmaPack annotation.

This cannot be used on fields. At most one of these can be used on a type.

If the argument is n, it corresponds to #pragma pack(n/8) in C. If n is not a multiple of 8, this annotation will be ignored.

AttrPacked

The AttrPacked annotation.

This corresponds to __attribute__((packed)) in C. On MSVC targets, the behavior is the behavior of Clang.

Align(Option<u64>)

The Aligned annotation.

If the argument is Some(n), n must be a power of two and at least 8. It is the corresponding C argument but in bits instead of bytes.

If the argument is Some(n), it corresponds to __declspec(align(n/8)) on MSVC targets and __attribute__((aligned(n/8))) otherwise.

If the argument is None, it corresponds to __attribute__((aligned)). On MSVC targets, the behavior is the behavior of Clang.

Trait Implementations

impl Clone for Annotation

fn clone(&self) -> Annotation

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Annotation

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq for Annotation

fn eq(&self, other: &Annotation) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Annotation

impl Eq for Annotation

impl StructuralPartialEq for Annotation