Enum Composition 

pub enum Composition {
    Single(Shift),
    Zero,
    Pair,
}

What the composition of two shifts denotes.

Composing two shifts does not always need two: they may collapse to one shift, or clear the word outright. A caller merging shifts has to tell those apart — the collapsed cases save a shift slot, and the cleared case means the term contributes nothing and should be dropped rather than encoded.

Variants

Single(Shift)

The two collapse to this single shift, which may be Shift::IDENTITY.

Zero

The two clear every bit, so the term they apply to is zero.

Pair

The two do not collapse; both are needed, in the order they were given.

Trait Implementations

impl Clone for Composition

fn clone(&self) -> Composition

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Composition

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

Formats the value using the given formatter.

impl Hash for Composition

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Composition

fn eq(&self, other: &Composition) -> 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 Composition

impl Eq for Composition

impl StructuralPartialEq for Composition