scala - 禁止混合特定特征

Question

鉴于:

trait Foo
trait Bar { this: Foo => }
trait NoBar { this: Foo => }

有没有办法可以欺骗类型系统禁止:

new Foo with Bar with NoBar {}

Answer 1

并键入删除再次节省一天:

trait Foo
trait Dummy[A]
trait Bar extends Dummy[Bar]{ this: Foo => }
trait NoBar extends Dummy[NoBar]{ this: Foo => }
new Foo with Bar with NoBar {}

这会导致以下错误:

illegal inheritance; anonymous class $anon inherits different
type instances of trait Dummy: Dummy[Bar] and Dummy[NoBar]