如何通过反射收集成员，以便稍后作为参数传递

Question

因此，我正在研究一个概念，它涉及到自动写入一个ByteBuffer类的内容，扩展Bufferizable

abstract class Bufferizable {

    abstract val fieldOrder: Array<String>

    open fun size(): Int = TODO()

    var initialized = false

    open infix fun to(address: Long) {

        if (initialized) {

            addFunctions.forEach {  }

        } else {

            addFunctions = Array(fieldOrder.size) { null }
            members = Array(fieldOrder.size) { null }

            fieldOrder.forEachIndexed { i, field ->
                val member = this::class.declaredMemberProperties.find { it.name == field }!!
                addFunctions[i] = when (member.returnType) {
                    Mat4::class.defaultType.javaType -> WithAddress::addMat4
                    ...
                    else -> throw Error()
                } as BufferizableAddFunctionType
                members[i] = member.get(this) // error
            }

            initialized = true
        }
    }

    infix fun from(address: Long): Unit = TODO()

    var addFunctions = arrayOf<BufferizableAddFunctionType?>()
    var members = arrayOf<Any?>()
}

typealias BufferizableAddFunctionType = (Any) -> Unit

object WithAddress {

    var address = NULL
    var offset = 0

    fun addMat4(mat4: Mat4) {
        for (i in 0..3)
            for (j in 0..3) {
                memPutFloat(address + offset, mat4[i, j])
                offset += Float.BYTES
            }
    }
    ...
}

例如，我们的想法是声明以下内容

object uboVS : Bufferizable() {

    var projectionMatrix = Mat4()
    var modelMatrix = Mat4()
    ...

    override val fieldOrder = arrayOf("projectionMatrix", "modelMatrix", "viewMatrix")
}

然后，每当第一次调用uboVS to address时，就会初始化它，然后按照指定的顺序将其内容写入本机地址。

但我遇到的唯一问题是收集成员，以便稍后作为参数传递给I-thaddFunction

因为编译器在这里抱怨：

members[i] = member.get(this)

错误：（328,37）Kotlin:Out投影类型“KProperty1”禁止使用Kotlin中定义的“public abstract fun get（接收方：T）：R”。反映KProperty1'

我怎么解决？

Answer 1

这是一个继承问题。您的反射调用::class.declaredMemberProperties.find{...}返回一个KProperty ty1

members[i] = member.getter.call(this)

通过getter函数属于对象而不是反射api，它遵循默认继承行为并且可以被调用。