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PO
primarykey
Id
9391611
data
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0
AnswerCount
0
ClosedDate
CommentCount
8
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CreationDate
2012-02-22T08:47:17.940
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2012-02-26T17:15:24.757
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2012-02-26T17:15:24.757
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435904
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435904
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9391237
PostTypeId
2
Score
8
ViewCount
0
LastEditorDisplayName
text
Body
<p>In this case you can use <a href="http://www.scala-lang.org/api/current/index.html#scala.Either" rel="nofollow">scala.Either</a></p> <pre><code>scala> val map: Map[String, Either[String, () => String]] = Map.empty map: Map[String,Either[String,() => String]] = Map() scala> map + ("key" -> Left("value")) res0: scala.collection.immutable.Map[String,Either[String,() => String]] = Map(key -> Left(value)) scala> res0("key") res1: Either[String,() => String] = Left(value) scala> map + ("key2" -> Right(() => "value2")) res2: scala.collection.immutable.Map[String,Either[String,() => String]] = Map(key2 -> Right(<function0>)) scala> res2("key2") res3: Either[String,() => String] = Right(<function0>) </code></pre> <h3>Update</h3> <p>You can hide implementation from caller using something like this.</p> <pre><code>def toEither[T <: Any : Manifest](x: T): Either[String, () => String] = x match { case x: String => Left(x) case x: Function0[String] if manifest[T] <:< manifest[() => String] => Right(x) case _ => throw new IllegalArgumentException } </code></pre> <p>The actual type of <code>Function0</code> is eliminated due type erasure, but it can be verified with <code>Manifest</code></p> <pre><code>scala> map + ("key" -> toEither("value")) res1: scala.collection.immutable.Map[String,Either[String,() => String]] = Map(key -> Left(value)) scala> map + ("key2" -> toEither(() => "value2")) res2: scala.collection.immutable.Map[String,Either[String,() => String]] = Map(key2 -> Right(<function0>)) scala> res2("key2").right.get() res3: String = value2 scala> map + ("key2" -> toEither(() => 5)) java.lang.IllegalArgumentException scala> map + ("key2" -> toEither(false)) java.lang.IllegalArgumentException </code></pre> <h3>Update2</h3> <p>As @Submonoid rightly corrected me in the comments below, there is much simpler way of dealing with <code>Either</code>.</p> <pre><code>type StringOrFun = Either[String, () => String] implicit def either(x: String): StringOrFun = Left(x) implicit def either(x: () => String): StringOrFun = Right(x) val m: Map[String, StringOrFun] = Map("key" -> "value", "key2" -> (() => "value2")) </code></pre>
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