Kotlin 中的内联构造函数是什么

首先，我必须澄清，我不是在问什么是内联函数，或者什么是内联类. 在Kotlin语言文档或规范中没有任何对内联构造函数的引用，但是如果您查看Arrays.kt个源代码，您会看到这样一个类:ByteArray有一个内联构造函数:

/**
 * An array of bytes. When targeting the JVM, instances of this class are represented as `byte[]`.
 * @constructor Creates a new array of the specified [size], with all elements initialized to zero.
 */
public class ByteArray(size: Int) {
    /**
     * Creates a new array of the specified [size], where each element is calculated by calling the specified
     * [init] function.
     *
     * The function [init] is called for each array element sequentially starting from the first one.
     * It should return the value for an array element given its index.
     */
    public inline constructor(size: Int, init: (Int) -> Byte)

让我们考虑创建一个类似的类，如下所示:

    public class Student(name: String) {
        public inline constructor(name: String, age: Int) : this(name)
    }

If you try to create that class in Kotlin and write an inline constructor for it you see that it's impossible and IDE refers to this error:

Modifier 'inline' is not applicable to 'constructor'

那么让我们回顾一下，ByteArray的定义是如何正确的呢？