I'm trying to achieve similar data class definition like the following C one:
struct A {
int b;
struct {
int d;
} c;
};
According to Dmitry Jemerov it is possible, but he didn't provide any code sample. https://discuss.kotlinlang.org/t/is-there-a-reason-for-not-allowing-inner-data-classes/2526/5
只需将其嵌套在另一个类中即可.嵌套类可以是数据类.
如果这是真的，应该怎么做呢？
No, Kotlin does not support anonymous structures like that.
You can both literally nest the classes:
data class A(
val b: Int,
val c: C
) {
data class C(
val d: Int
)
}
Or use a more common syntax:
data class C(
val d: Int
)
data class A(
val b: Int,
val c: C
)
其实，在这里"筑巢"是没有必要的.不同之处主要在于您访问C类的方式:A.C个或仅C个.