9
我写的一小段代码来测试动态特性功能:动态特性的差异,从斯卡拉2.9至2.10
class Foo extends Dynamic {
def selectDynamic(name: String) {
println("selectDynamic: " + name)
}
def applyDynamic(name: String)(args: Any*) {
println("applyDynamic: " + name)
}
def applyDynamicNamed(name: String)(args: (String, Any)*) {
println("applyDynamicNamed: " + name)
}
def updateDynamic(name: String)(value: Any) {
println("updateDynamic: " + name)
}
}
object Test {
def main(args: Array[String]) {
val foo = new Foo
foo.bar(5) //1
foo.bar(x = 5) //2
foo.bar //3
foo.baz = 5 //4
}
}
的问题是,它不会在两者斯卡拉2.9和2.10,因为编译在main
第四行:
error: reassignment to val
foo.baz = 5
如果我评论此字符串,2.9会抱怨下联:
error: not found: value x
foo.bar(x = 5)
同时将2.10编译程序将产生:
applyDynamic: bar
applyDynamicNamed: bar
selectDynamic: bar
所以,现在我不知道我做错了什么(也许会错过一些依赖)?在Scala 2.9和2.10中,Dynamic有没有区别?那么foo.baz = 5
有什么问题?
尝试'foo.baz()= 5'。 – senia
'错误:值更新不是单位的成员; foo.baz()= 5' –