为什么这种结构类型绑定不能按预期工作？
我正在尝试编写一个简单的辅助方法，它接收可以关闭的东西和一些接收前者的函数，并确保在执行函数后关闭“closeable”。
例如，我想像这样使用它：
closing(new FileOutputStream("/asda"))(_.write("asas"))
object Helpers {
def closing[T <: { def close }](closeable: T)(action: T => Unit): Unit =
try action apply closeable finally closeable close
}
object Test {
import Helpers._
closing(new FileOutputStream("/asda"))(_.write("asas"))
}
没有找到相关结果
已邀请:
2 个回复
膛嵌墒缅欠
def closing[T <: { def close() }]豪抱怒掳
class A { def f = 5 } class B { def f() = 5 } class C { def f()() = 5 } def useA[X <: { def f: Int }](x: X) = x.f def useB[X <: { def f(): Int }](x: X) = x.f def useC[X <: { def f()(): Int}](x: X) = x.f useA(new A) // This works, but what other combinations do?def closing[T <: { def close() }] ...class D extends B { override def f = 6 } class E extends A { override def f() = 6 }