Yes. It is possible to completely omit the requirement to create an implementation of a trait if that trait contains a default method:
trait MyTrait
{
fn test_code(&self) -> bool;
fn self_test_code(&self) -> bool { self.test_code() } }test_code is just the stub which requires an implementation. The self_test_code function doesn't need an implementation as it has a default method already.
It can.
Let's start the code off by defining a trait. This has a default method for is_not_done. We will still need to implement is_done though, which we do for the UseFirstTime struct:
struct UseFirstTime;
impl MyTrait for UseFirstTime
{
fn is_done(&self) -> bool
{
println!("UseFirstTime.is_done");
true
}
}We next want to override the default method for is_not_done. Again, we create an empty struct and write both the implementations...