Kotlin 等於自定義通用 class

Question

我似乎無法弄清楚如何為自定義通用集合編寫 equals function 。
class 包含通用data: Array<T>作為字段

override fun equals(other: Any?): Boolean {
    if (this === other) return true
    if (other == null || this::class != other::class) return false

    other as CustomCollection<*>

    if (size != other.size) return false

    return (0 until size).all { data[it] == other.data[it] }
}

這失敗並出現以下錯誤： Unsupported Array Nothing in return type is illegal

但是語言沒有給我任何選擇。
如果我將 object 轉換為CustomCollection<Any>我會收到一條警告，這很煩人。
有沒有辦法在沒有警告或錯誤的情況下正確處理這種情況？

Answer 1

如果你檢查

// not this
if (other == null || this::class != other::class) return false
//but:
if (other == null || other !is CustomCollection<*>) return false

class CustomCollection<T>(private val data: Array<T>) {
    val size
        get() = data.size
    override fun equals(other: Any?): Boolean {
        if (this === other) return true
        if (other == null || other !is CustomCollection<*>) return false

        if (size != other.size) return false

        /* this will return true if [other] has a longer array that has the same 
         * start, not sure if you want that, consider         
         */
        // return data.contentEquals(other.data)
        return (0 until size).all { data[it] == other.data[it] }
    }   
}

沒有給我任何警告