Struct SpanField 

struct SpanField {
    shift: u32,
    width: u32,
}

Specifies a field within one of the span formats. Provides const operations that (a) let a span format be fully specified, and (b) check/read/write the field for/from/to a span.

Fields

shift: u32

The field’s bit position, where zero means it’s in the lowest bits.

width: u32

The field’s width, in bits.

Implementations

impl SpanField

const fn top(width: u32) -> Self

Specifies the top field, i.e. the highest bits. Chained with below.

const fn below(self, width: u32) -> Self

Specifies a field that comes below the field in self. Chainable.

const fn mask(self) -> u64

The mask for the (downshifted to 0..n) field.

const fn get(self, u: u64) -> u32

Gets the field from a span-as-u64 as a u32.

const fn set(self, v: u32) -> u64

Sets the field to v in an otherwise-zero span-as-u64.

const fn too_big(self, v: u32) -> u32

Returns non-zero if v is too big to fit in the field.

const fn assert_is_bottom(self)

Asserts that a field uses the bottom-most bits.

Trait Implementations

impl Clone for SpanField

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SpanField

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: 8 bytes