我有一个以.box { margin-bottom: 0; }
[class*="col-lg-"],[class*="col-md-"],
[class*="col-sm-"],[class*="col-xs-"]{
padding-right:0 !important;
padding-left:0 !important;
}
为参数的函数,当我传递它时,它表示实际传递的参数是Writes[Class.type]
并且拒绝编译。
两者有什么区别?
答案 0 :(得分:4)
Class
指的是名为Class
的类型。 Class.type
指的是名为Class
的对象的类型。
以此代码为例:
class Foo {
val x = 42
}
object Foo {
val y = 23
}
def f(foo: Foo) {
println(foo.x)
// The next line wouldn't work because the Foo class does not have a member y:
// println(foo.y)
}
def g(foo: Foo.type) {
println(foo.y)
// The next line wouldn't work because the Foo object does not have a member x:
println(foo.x)
}
val foo1 = new Foo
val foo2 = new Foo
f(foo1)
f(foo2)
// Does not work because the object Foo is not an instance of the class Foo:
// f(Foo)
g(Foo)
// Does not work because g only accepts the object Foo:
// g(foo1)