pub trait Encode {
// Required method
fn encode(&self, encoder: &mut Encoder) -> Result<()>;
// Provided method
fn encode_sized(&self, encoder: &mut Encoder, _size: usize) -> Result<()> { ... }
}
pub trait Encode {
// Required method
fn encode(&self, encoder: &mut Encoder) -> Result<()>;
// Provided method
fn encode_sized(&self, encoder: &mut Encoder, _size: usize) -> Result<()> { ... }
}