struct Dog {}
struct Cat {}
fn (d Dog) speak() string {
return 'woof'
}
fn (c Cat) speak() string {
return 'meow'
}
interface Speaker {
speak() string
}
fn perform(s Speaker) {
println(s.speak())
}
dog := Dog{}
cat := Cat{}
perform(dog) // ==> "woof"
perform(cat) // ==> "meow"
类型通过实现其方法来实现接口。没有明确的意图声明,没有“implements”关键字。