Custom hashCode methods for case classes.

No boxing, no MODULE$ indirection.

1 files changed, 37 insertions, 0 deletions

diff --git a/test/files/run/caseClassHash.scala b/test/files/run/caseClassHash.scala
new file mode 100644
index 0000000000..7adfddedf8
--- /dev/null
+++ b/test/files/run/caseClassHash.scala
@@ -0,0 +1,37 @@
+case class Foo[T](a: Boolean, b: Byte, c: Short, d: Char, e: Int, f: Long, g: Double, h: Float, i: AnyRef, j: T) { }
+
+object Test {
+  def mkFoo[T](x: T) = Foo[T](true, -1, -1, 100, -5, -10, 500d, 500f, Nil, x)
+
+  def main(args: Array[String]): Unit = {
+    val foo1 = mkFoo[Double](5.0d)
+    val foo2 = mkFoo[Long](5l)
+
+    List(foo1, foo2, foo1.##, foo2.##, foo1 == foo2) foreach println
+
+    println("## method 1: " + foo1.##)
+    println("## method 2: " + foo2.##)
+    println("   Murmur 1: " + scala.util.MurmurHash3.productHash(foo1))
+    println("   Murmur 2: " + scala.util.MurmurHash3.productHash(foo2))
+  }
+}
+
+object Timing {
+  var hash = 0
+  def mkFoo(i: Int) = Foo(i % 2 == 0, i.toByte, i.toShort, i.toChar, i, i, 1.1, 1.1f, this, this)
+
+  def main(args: Array[String]): Unit = {
+    val reps = if (args.isEmpty) 100000000 else args(0).toInt
+    val start = System.nanoTime
+
+    println("Warmup.")
+    1 to 10000 foreach mkFoo
+
+    hash = 0
+    1 to reps foreach (i => hash += mkFoo(i).##)
+
+    val end = System.nanoTime
+    println("hash = " + hash)
+    println("Elapsed: " + ((end - start) / 1e6) + " ms.")
+  }
+}