generics - 不满意 : inferred type T? 不是 Any 的子类型

Question

为了映射结果，我实现了密封的泛型类:

public sealed class ResultMapper<out T : Any> {
    public class Ok<out T : Any>(public val value: T,
                            override val response: Response) : Result<T>(), ResponseResult {
        override fun toString(): String = "Result.Ok{value=$value, response=$response}"
    }
}

   public interface ResponseResult {
     val response: Response
   } 

现在我想这个类应该按预期工作如下行为:

 ResultMapper.Ok(body,raw)

private class Body<T>() {
  onResponse(response: Response, raw: Raw) {
   ResultMapper.Ok(response.body(),response.raw()) --> It returned an exception
  }
}

Constructor Ok is not satisfied: inferred type T? is not subtype of Any

Answer 1

类(class)Body有一个泛型类型参数 T没有任何限制，即就像定义 T: Any?而Ok的类型参数限制为 T: Any .你应该调整Body也不允许可空类型:

class Body<T: Any>

或者，删除其他类中的上限。