如何执行伴随对象lateinit是初始化检查

问题描述

如果我有一个Lateinit变量，我可以检查是否使用(this :: lateInitVar.isInitialized)对其进行了初始化，如 https中所示://stackoverflow.com/a/47860466/3286489

If I have a lateinit variable, I could check is it initialized using (this::lateInitVar.isInitialized), as shown in https://stackoverflow.com/a/47860466/3286489

但是如果变量是伴随对象，该怎么办?

However if the variable is a companion object, how could I do so?

例如

class MyClass {

    companion object {
        lateinit var myGlobalLateInit: String
    }

    lateinit var myLocalLateInit: String

    fun settingVariable() {
        if (!this::myLocalLateInit.isInitialized) {
            myLocalLateInit = "I am set"
        }

        if (!MyClass::myGloablLateInit.isInitialized) { // This line will error out. How could I set it?
            myGloablLateInit = "I am set"
        }

    }

}

推荐答案

您可以将其提取到伴随对象内部的函数中:

You could extract it into a function inside the companion object:

class MyClass {

    companion object {
        lateinit var myGlobalLateInit: String

        fun isMyGlobalLateInitInitialized() = ::myGlobalLateInit.isInitialized
    }

    fun settingVariable() {
        if (!isMyGlobalLateInitInitialized()) {
            myGlobalLateInit = "I am set"
        }

    }

}

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