Pair and Triple classes added

libraries/stdlib/src/kotlin/Tuples.kt

@@ -0,0 +1,58 @@
+package kotlin
+
+import kotlin.nullable.hashCodeOrDefault
+import java.io.Serializable
+
+// TODO: make it a data class
+public class Pair<A, B> (
+        public val first: A,
+        public val second: B
+) : Serializable {
+    public fun component1(): A = first
+    public fun component2(): B = second
+
+    override fun toString(): String = "($first, $second)"
+
+    override fun hashCode(): Int {
+        var result = first.hashCodeOrDefault(0)
+        result = 31 * result + second.hashCodeOrDefault(0)
+        return result;
+    }
+
+    override fun equals(o: Any?): Boolean {
+        if (this identityEquals o) return true;
+        if (o == null || this.javaClass != o.javaClass) return false;
+
+        val t = o as Pair<*, *>
+        return first == t.first && second == t.second;
+    }
+}
+
+public class Triple<A, B, C> (
+        public val first: A,
+        public val second: B,
+        public val third: C
+) : Serializable {
+    public fun component1(): A = first
+    public fun component2(): B = second
+    public fun component3(): C = third
+
+    override fun toString(): String = "($first, $second, $third)"
+
+    override fun hashCode(): Int {
+        var result = first.hashCodeOrDefault(0)
+        result = 31 * result + second.hashCodeOrDefault(0)
+        result = 31 * result + third.hashCodeOrDefault(0)
+        return result;
+    }
+
+    override fun equals(o: Any?): Boolean {
+        if (this identityEquals o) return true;
+        if (o == null || this.javaClass != o.javaClass) return false;
+
+        val t = o as Triple<*, *, *>
+        return first == t.first &&
+               second == t.second &&
+               third == t.third;
+    }
+}