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plurals

PO
primarykey
Id
4919725
data
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0
AnswerCount
0
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2
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CreationDate
2011-02-07T09:31:39.970
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0
LastActivityDate
2011-02-07T09:58:52.467
LastEditDate
2011-02-07T09:58:52.467
LastEditorUserId
354067
OwnerUserId
354067
ParentId
4918362
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
First case, <pre><code>save(throw new RuntimeException("boom!")) _ </code></pre> According to <a href="http://www.scala-lang.org/docu/files/ScalaReference.pdf" rel="nofollow">"Scala Reference"</a> (§6.7), trailing underscore is used in place of the argument list, and expression is converted to <pre><code>val f: (Boolean) => Unit = save(throw new RuntimeException("boom!")) </code></pre> where the first argument of <code>def save</code> is immediately evaluated. <blockquote> The expression e _ is well-formed if e is of method type or if e is a call-by-name parameter. If e is a method with parameters, e _ represents e converted to a function type by eta expansion (§6.26.5). If e is a parameterless method or call-by-name parameter of type =>T , e _ represents the function of type () => T , which evaluates e when it is applied to the empty parameterlist (). </blockquote> To make the things work as you expect, some modifications are required: <pre><code>scala> def save(f:() => Any)(run:Boolean) { if (run) { println("running f"); f() } else println("not running f") } save: (f: () => Any)(run: Boolean)Unit scala> val f = save(() => throw new RuntimeException("boom!")) _ f: (Boolean) => Unit = <function1> scala> f(true) running f java.lang.RuntimeException: boom! at $anonfun$1.apply(<console>:6) </code></pre> Second case, <pre><code>save(throw new RuntimeException("boom!"))(_) </code></pre> According to <a href="http://www.scala-lang.org/docu/files/ScalaReference.pdf" rel="nofollow">"Scala Reference"</a> (§6.23), when placeholder is used as a replacement for an argument, the expression is converted to <pre><code>val f: (Boolean) => Unit = save(throw new RuntimeException("boom!"))(_) </code></pre>
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1. This table or related slice is empty.
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1. POPartial function application prematurely runs codeblock when used with underscore
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1. USVasil Remeniuk
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1. USVasil Remeniuk
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1. COReally, according to the quoted specification I'd expect call by name to work. After all, in that case `e` is only evaluated when applied to the empty parameter list.
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2. COI agree with Daniel. If as the spec says the call gets converted to () => T then the function will not be evaluated until it is applied.
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