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【Kotlin】KTypeからKClassを取得する

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やること

Kotlinのリフレクションで取れるKTypeからKClassを取得します。

やり方

例として、ラムダから引数のKClassを取る例を示します。

val lambda: (String?) -> Any? = { /* ラムダの内容は省略 */ }
val reflect: KFunction<Any?> = lambda.reflect()!!

val kType: KType = reflect.parameters.first().type
val classifier = type.classifier!!

// 実際にはKClass<String>が取れる
val kClass: KClass<*> = classifier as KClass<*>

実際にはKClass<String>が取れてしまって(= nullabilityの情報が消えて)いますが、一応KClassが取得できました。

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