How to use Parcelable in Kotlin v1.0.0-beta-4589

KotlinParcelable

// ------------ Helper extension functions:

// Inline function to create Parcel Creator
inline fun <reified T : Parcelable> createParcel(crossinline createFromParcel: (Parcel) -> T?): Parcelable.Creator<T> =
        object : Parcelable.Creator<T> {
            override fun createFromParcel(source: Parcel): T? = createFromParcel(source)
            override fun newArray(size: Int): Array<out T?> = arrayOfNulls(size)
        }

// custom readParcelable to avoid reflection
fun <T : Parcelable> Parcel.readParcelable(creator: Parcelable.Creator<T>): T? {
    if (readString() != null) return creator.createFromParcel(this) else return null
}

// ------------ Classes:

data class RedditNews(
        val after: String,
        val before: String,
        val news: List<RedditNewsItem>) : Parcelable {

    companion object {
        val CREATOR = createParcel { RedditNews(it) }
    }

    protected constructor(parcelIn: Parcel) : this(
            parcelIn.readString(),
            parcelIn.readString(),
            listOf<RedditNewsItem>().apply {
                parcelIn.readTypedList(this, RedditNewsItem.CREATOR)
            }
    )

    override fun writeToParcel(dest: Parcel, flags: Int) {
        dest.writeString(after)
        dest.writeString(before)
        dest.writeTypedList(news)
    }

    override fun describeContents() = 0
}

data class RedditNewsItem(
        val author: String,
        val title: String,
        val numComments: Int,
        val created: Long,
        val thumbnail: String,
        val url: String
) : Parcelable {

    companion object {
        val CREATOR = createParcel { RedditNewsItem(it) }
    }

    protected constructor(parcelIn: Parcel) : this(
            parcelIn.readString(),
            parcelIn.readString(),
            parcelIn.readInt(),
            parcelIn.readLong(),
            parcelIn.readString(),
            parcelIn.readString()
    )

    override fun writeToParcel(dest: Parcel, flags: Int) {
        dest.writeString(author)
        dest.writeString(title)
        dest.writeInt(numComments)
        dest.writeLong(created)
        dest.writeString(thumbnail)
        dest.writeString(url)
    }

    override fun describeContents() = 0
}