Add Either type with left, right and match functions

Author: Stypox

app/src/main/java/org/schabi/newpipe/util/Either.kt

@@ -0,0 +1,25 @@
+package org.schabi.newpipe.util
+
+import androidx.compose.runtime.Stable
+import kotlin.reflect.KClass
+import kotlin.reflect.cast
+import kotlin.reflect.safeCast
+
+@Stable
+data class Either<A : Any, B : Any>(
+    val value: Any,
+    val classA: KClass<A>,
+    val classB: KClass<B>,
+) {
+    inline fun <R> match(ifLeft: (A) -> R, ifRight: (B) -> R): R {
+        return classA.safeCast(value)?.let { ifLeft(it) }
+            ?: ifRight(classB.cast(value))
+    }
+
+    companion object {
+        inline fun <reified A : Any, reified B : Any> left(a: A): Either<A, B> =
+            Either(a, A::class, B::class)
+        inline fun <reified A : Any, reified B : Any> right(b: B): Either<A, B> =
+            Either(b, A::class, B::class)
+    }
+}