Enum Narrowed 

pub enum Narrowed<T> {
    Value(T),
    Default,
}

What a narrowing decided.

Default and not the default value itself: Table 9’s default for a type is a language value the runtime cannot spell — an empty Vec, a struct literal with a value per member, an enumeration’s first literal — and the generated code has it already, from the same table the other three columns derive theirs from.

Variants

Value(T)

Keep this value. It either fitted or was trimmed to fit.

Default

Substitute the receiving member’s default value.

Trait Implementations

impl<T: Clone> Clone for Narrowed<T>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Narrowed<T>

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

Formats the value using the given formatter.

impl<T: Eq> Eq for Narrowed<T>

impl<T: PartialEq> PartialEq for Narrowed<T>

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

Equality operator ==.

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

Inequality operator !=.

impl<T: PartialEq> StructuralPartialEq for Narrowed<T>