Introduce a utility Pair.
R=sgjesse
Change-Id: I066b08c8b367e8f56be37d8b63bdd89243a37bb6
diff --git a/src/main/java/com/android/tools/r8/utils/Pair.java b/src/main/java/com/android/tools/r8/utils/Pair.java
new file mode 100644
index 0000000..ac58f56
--- /dev/null
+++ b/src/main/java/com/android/tools/r8/utils/Pair.java
@@ -0,0 +1,53 @@
+// Copyright (c) 2017, the R8 project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+package com.android.tools.r8.utils;
+
+import com.android.tools.r8.errors.Unreachable;
+
+/**
+ * Simple pair to enable returning multiple values from a function.
+ *
+ * <p>This should not be used for anything besides arguments and return values. In particular, it
+ * is not comparable and does not support hashing. Introduce a proper named type for use cases
+ * demanding such.
+ */
+public class Pair<T, S> {
+ private T first;
+ private S second;
+
+ public Pair() {
+ this(null, null);
+ }
+
+ public Pair(T first, S second) {
+ this.first = first;
+ this.second = second;
+ }
+
+ public T getFirst() {
+ return first;
+ }
+
+ public S getSecond() {
+ return second;
+ }
+
+ public void setFirst(T first) {
+ this.first = first;
+ }
+
+ public void setSecond(S second) {
+ this.second = second;
+ }
+
+ @Override
+ public int hashCode() {
+ throw new Unreachable("Pair does not want to support hashing!");
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ throw new Unreachable("Pair does not want to support equality!");
+ }
+}
