1 files changed, 31 insertions, 0 deletions
diff --git a/library/src/dotty/runtime/Arrays.scala b/library/src/dotty/runtime/Arrays.scala
new file mode 100644
index 000000000..9ec5512ad
--- /dev/null
+++ b/library/src/dotty/runtime/Arrays.scala
@@ -0,0 +1,31 @@
+package dotty.runtime
+
+import scala.reflect.ClassTag
+
+import java.lang.{reflect => jlr}
+
+/** All but the first two operations should be short-circuited and implemented specially by
+ *  the backend.
+ */
+object Arrays {
+
+  // note: this class is magical. Do not touch it unless you know what you are doing.`
+
+  /** Creates an array of some element type determined by the given `ClassTag`
+   *  argument. The erased type of applications of this method is `Object`.
+   */
+  def newGenericArray[T](length: Int)(implicit tag: ClassTag[T]): Array[T] =
+    tag.newArray(length)
+
+  /** Convert a sequence to a Java array with element type given by `clazz`. */
+  def seqToArray[T](xs: Seq[T], clazz: Class[_]): Array[T] = {
+    val arr = java.lang.reflect.Array.newInstance(clazz, xs.length).asInstanceOf[Array[T]]
+    xs.copyToArray(arr)
+    arr
+  }
+
+  /** Create an array of a reference type T.
+   */
+  def newArray[Arr](componentType: Class[_], returnType: Class[Arr], dimensions: Array[Int]): Arr =
+    jlr.Array.newInstance(componentType, dimensions: _*).asInstanceOf[Arr]
+}