Deriving
Supported traits can be automatically implemented for your custom types, as follows:
Speaker Notes
This slide should take about 3 minutes.
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Derivation is implemented with macros, and many crates provide useful derive macros to add useful functionality. For example,
serde
can derive serialization support for a struct using#[derive(Serialize)]
. -
Derivation is usually provided for traits that have a common boilerplate-y implementation that is correct for most cases. For example, demonstrate how a manual
Clone
impl can be repetitive compared to deriving the trait:impl Clone for Player { fn clone(&self) -> Self { Player { name: self.name.clone(), strength: self.strength.clone(), hit_points: self.hit_points.clone(), } } }
Not all of the
.clone()
s in the above are necessary in this case, but this demonstrates the generally boilerplate-y pattern that manual impls would follow, which should help make the use ofderive
clear to students.