Enum async_graphql::MaybeUndefined

pub enum MaybeUndefined<T> {
    Undefined,
    Null,
    Value(T),
}

Similar to Option, but it has three states, undefined, null and x.

Spec: https://spec.graphql.org/June2018/#sec-Null-Value

Variants

Undefined

Null

Value(T)

Implementations

impl<T> MaybeUndefined<T>

pub fn is_undefined(&self) -> bool

Returns true if the MaybeUndefined is undefined.

pub fn is_null(&self) -> bool

Returns true if the MaybeUndefined is null.

pub fn value(&self) -> Option<&T>

Borrow the value, returns None if the value is undefined or null, otherwise returns Some(T).

pub fn take(self) -> Option<T>

Convert MaybeUndefined to Option.

Trait Implementations

impl<T: Type> Type for MaybeUndefined<T>

fn type_name() -> Cow<'static, str>

Type the name.

fn qualified_type_name() -> String

Qualified typename.

fn create_type_info(registry: &mut Registry) -> String

Create type information in the registry and return qualified typename.

fn introspection_type_name(&self) -> Cow<'static, str>

Introspection type name