Enum AllowNull 

pub enum AllowNull {
    Yes,
    No,
}

Describes whether an argument may have a null value.

Variants

Yes

Null values are allowed.

No

Null values are forbidden.

Trait Implementations

impl Clone for AllowNull

fn clone(&self) -> AllowNull

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AllowNull

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

Formats the value using the given formatter.

impl PartialEq for AllowNull

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

impl Eq for AllowNull

impl StructuralPartialEq for AllowNull