Scala 提升类型不匹配？
我目前正在编写一个网络应用程序，我想使用提交表单中的值，但出现类型不匹配：
类型不匹配；发现：connectfour.Board=>选项[Int] 必需：() => 我的代码
看起来像这样：
var value=0
"name=value" #> SHtml.onSubmit(s => asInt(s).foreach(value= _)) &
// when the form is submitted, process the variable
"type=submit" #> SHtml.onSubmitUnit(askForHumanMove)
和我的askForHumanMove 方法：
def askForHumanMove(board: connectfour.Board): Option[Int] = {
Some(value)
}
希望有人可以帮助我解决这种类型不匹配的问题。
谢谢你！
此致， 约翰
I am programming a webapp at the moment and I want to use a value from a submit form but get a type mismatch:
type mismatch; found : connectfour.Board=> Option[Int] required: () => Any
My code looks like this:
var value=0
"name=value" #> SHtml.onSubmit(s => asInt(s).foreach(value= _)) &
// when the form is submitted, process the variable
"type=submit" #> SHtml.onSubmitUnit(askForHumanMove)
and my askForHumanMove method:
def askForHumanMove(board: connectfour.Board): Option[Int] = {
Some(value)
}
Hope somebody can help me with this type mismatch.
Thank you!
Best regards,
John
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在我看来，
onSubmitUnit接受() =>; Any作为参数。但是您传递的方法被提升到函数Board =>;选项[Int]。这些类型不兼容。在调用
onSubmitUnit方法时，您的范围内是否有相关的Board实例？如果是这样，修复方法很简单：It looks to me that
onSubmitUnitaccepts a() => Anyas a parameter. But you are passing a method which is being lifted into a functionBoard => Option[Int]. These types are not compatible.Do you have the relevant instance of
Boardin scope at the point of calling theonSubmitUnitmethod? If so, the fix is simple: