问题描述
我想从Kotlin调用重载的Java函数.我想使用 null 作为对重载分辨率有意义的参数.
I want to call a overloaded java-function from Kotlin. I want to use a null for parameter that significant to a overload resolution.
如何为 null 值指定 IntArray 类型?
我不喜欢带有普通类型附加变量的解决方案.
I don't like a solution with additional varibale of common type.
推荐答案
不是将变量强制转换，而是将 null设置为IntArray?，例如:
Instead of a variable just cast it, i.e. null as IntArray?, e.g.:
origImg.data.getSamples(0, 0, origImg.width, origImg.height, 0, null as IntArray?)
请注意，这与Java中的行为相同，在Java中，您还需要强制转换 null ，例如(int [])null ，以调用适当的重载方法.
Note that this is the same behaviour as in Java, where you also needed to cast null, e.g. (int[]) null, to call the appropriate overloaded method.
您可以构建一个函数，为您提供〜类型的 null (如果尚不存在)，并使用以下类型:
You could build a function that gives you a ~typed null (if it doesn't exist yet) with a reified type:
inline fun <reified T>typedNull(): T? = null
并通过以下方式调用它:
and calling it with:
typedNull<IntArray>()
但是再说一次，像IntArray一样为空?我认为很清楚，人们已经知道了.
But then again, null as IntArray? is clear enough I think and people know it already.
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