Add index access support to base::Tuple

base/tuple_unittest.cc

Index: base/tuple_unittest.cc
diff --git a/base/tuple_unittest.cc b/base/tuple_unittest.cc
index 8d620deb63984a2d6affda22e345d8613062af47..9715d552365f1f76dd5a9897de92f0507e4270b1 100644
--- a/base/tuple_unittest.cc
+++ b/base/tuple_unittest.cc
@@ -57,6 +57,24 @@ TEST(TupleTest, Basic) {
   EXPECT_EQ(4, t6.d);
   EXPECT_EQ(5, t6.e);
 
+  EXPECT_EQ(1, t1.Get<0>());
+  EXPECT_EQ(1, t2.Get<0>());
+  EXPECT_EQ(1, t3.Get<0>());
+  EXPECT_EQ(2, t3.Get<1>());
+  EXPECT_EQ(3, t3.Get<2>());
+  EXPECT_EQ(1, t4.Get<0>());
+  EXPECT_EQ(2, t4.Get<1>());
+  EXPECT_EQ(3, t4.Get<2>());
+  EXPECT_EQ(1, t5.Get<0>());
+  EXPECT_EQ(2, t5.Get<1>());
+  EXPECT_EQ(3, t5.Get<2>());
+  EXPECT_EQ(4, t5.Get<3>());
+  EXPECT_EQ(1, t6.Get<0>());
+  EXPECT_EQ(2, t6.Get<1>());
+  EXPECT_EQ(3, t6.Get<2>());
+  EXPECT_EQ(4, t6.Get<3>());
+  EXPECT_EQ(5, t6.Get<4>());
+
   EXPECT_EQ(1, t1.a);
   DispatchToFunction(&DoAdd, t4);
   EXPECT_EQ(6, t1.a);