Enum InputContract 

pub enum InputContract {
    Fixed(PortContract),
    Any,
    Unknown,
}

What a Sink can be fed.

Any and Unknown both link to anything, but they mean opposite things and differ in what happens downstream of the element — see OutputContract::Passthrough.

Variants

Fixed(PortContract)

This element accepts exactly this and nothing else.

Any

A guarantee that every MediaKind is handled. A Queue forwards whatever it is given; an AppSink hands every buffer to its closure. Note the scope: this promises the element passes each kind along, not that the application’s own closure will succeed with it. A closure that only understands packets still returns its own error, which is outside what a link check can or should know.

Unknown

No claim. Links to anything, and stops the check from continuing past this element, because nothing here knows what comes out.

Trait Implementations

impl Clone for InputContract

fn clone(&self) -> InputContract

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for InputContract

impl Debug for InputContract

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

Formats the value using the given formatter.

impl Display for InputContract

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

Formats the value using the given formatter.

impl Eq for InputContract

impl PartialEq for InputContract

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for InputContract