Trait FormatElement 

pub trait FormatElement: ElementBound {
    // Required methods
    fn caps_constraint(&self) -> CapsConstraint<'_>;
    fn configure_link(
        &mut self,
        input: Option<&Caps>,
        output: Option<&Caps>,
    ) -> Result<(), G2gError>;

    // Provided method
    fn caps_preferences(&self) -> Option<CapsPreferences> { ... }
}

Negotiation-time view of an element. The runtime side (AsyncElement::process) is unchanged; this trait carries the information the solver needs to assign caps to every link before process runs.

Required Methods

fn caps_constraint(&self) -> CapsConstraint<'_>

Declare the constraint this element imposes on its surrounding links. Read by the solver during negotiation.

fn configure_link( &mut self, input: Option<&Caps>, output: Option<&Caps>, ) -> Result<(), G2gError>

Called by the runner once the solver has assigned caps to every link. Boundary elements (decoders, encoders) receive distinct input / output values; non-boundary elements receive equal ones. Sources see input = None; sinks see output = None.

Provided Methods

fn caps_preferences(&self) -> Option<CapsPreferences>

Optional per-alternative costs for this element’s advertised constraint. Defaults to None, meaning the solver uses the constraint’s own preference order (cost = alternative index).

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors