pub trait WeightProvider<Sc: Score>: Send + Sync {
// Required method
fn weight(&self, name: &str) -> Option<Sc>;
// Provided method
fn weight_or_default(&self, name: &str, default: Sc) -> Sc { ... }
}pub trait WeightProvider<Sc: Score>: Send + Sync {
// Required method
fn weight(&self, name: &str) -> Option<Sc>;
// Provided method
fn weight_or_default(&self, name: &str, default: Sc) -> Sc { ... }
}