StackOverflow2013

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plurals

PO
primarykey
Id
15880840
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2013-04-08T13:49:25.750
FavoriteCount
0
LastActivityDate
2013-04-08T13:49:25.750
LastEditDate
LastEditorUserId
0
OwnerUserId
196068
ParentId
15877486
PostTypeId
2
Score
5
ViewCount
0
LastEditorDisplayName
text
Body
To understand the reason your code doesn't compile, first note that Java uses <code>java.lang.Boolean</code> for the boxed boolean type, and Scala uses <code>scala.Boolean</code>. Most of the time, when you want to use one of them, and a method returns the other one (or a method argument requires the other one), an implicit conversion will be performed, and the correct type will be used. The method <code>a</code> that you wrote in Scala really returns <code>A[java.lang.Boolean]</code>. Because there's no implicit conversion between <code>A[java.lang.Boolean]</code> and <code>A[scala.Boolean]</code>, it will not automatically return <code>A[scala.Boolean]</code> in this case. To verify that this is the case, we can see that this method compiles without issues: <pre><code>def a: A[java.lang.Boolean] = new AT() </code></pre> To reiterate the point, because we don't have the implicit conversion, this will also not work (you'll see how that can be fixed below): <pre><code>val instanceOfA: A[Boolean] = a def a = new AT() // Error: AT doesn't conform to A[Boolean] </code></pre> To fix it, you could implicitly convert to the needed type by casting it: <pre><code>implicit def toScalaABoolean(a: A[java.lang.Boolean]): A[Boolean] = a.asInstanceOf[A[Boolean]] </code></pre> With that done, you don't even have to declare the return type of <code>a</code> method anymore: <pre><code>implicit def toDifferentBoolean(a: A[java.lang.Boolean]): A[Boolean] = a.asInstanceOf[A[Boolean]] val instanceOfA: A[Boolean] = a def a = new AT() </code></pre>
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1. POcannot implicitly cast A[T] to AT, where A[T] extends AT
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1. PTAnswer
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1. USAlex Yarmula
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1. POcannot implicitly cast A[T] to AT, where A[T] extends AT
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