Trait dataflow::source::MaybeLength

pub trait MaybeLength {
    fn len(&self) -> Option<usize>;
    fn is_empty(&self) -> bool;
}

Types that implement this trait expose a length function

Required methods

fn len(&self) -> Option<usize>

Returns the size of the object

fn is_empty(&self) -> bool

Returns true if the object is empty

Implementations on Foreign Types

impl MaybeLength for ()

fn len(&self) -> Option<usize>

fn is_empty(&self) -> bool

impl MaybeLength for Vec<u8>

fn len(&self) -> Option<usize>

fn is_empty(&self) -> bool

impl MaybeLength for Value

fn len(&self) -> Option<usize>

fn is_empty(&self) -> bool

impl MaybeLength for MessagePayload

fn len(&self) -> Option<usize>

fn is_empty(&self) -> bool

impl<T: MaybeLength> MaybeLength for Option<T>

fn len(&self) -> Option<usize>

fn is_empty(&self) -> bool

Implementors