Merge to upstream r225300.

Change-Id: I2b23715db9ac129ff80aa78ad5824db0a4d6fbb3

test/std/containers/sequences/array/array.special/swap.pass.cpp

@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <array>
+
+// template <class T, size_t N> void swap(array<T,N>& x, array<T,N>& y);
+
+#include <array>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef double T;
+        typedef std::array<T, 3> C;
+        C c1 = {1, 2, 3.5};
+        C c2 = {4, 5, 6.5};
+        swap(c1, c2);
+        assert(c1.size() == 3);
+        assert(c1[0] == 4);
+        assert(c1[1] == 5);
+        assert(c1[2] == 6.5);
+        assert(c2.size() == 3);
+        assert(c2[0] == 1);
+        assert(c2[1] == 2);
+        assert(c2[2] == 3.5);
+    }
+    {
+        typedef double T;
+        typedef std::array<T, 0> C;
+        C c1 = {};
+        C c2 = {};
+        swap(c1, c2);
+        assert(c1.size() == 0);
+        assert(c2.size() == 0);
+    }
+}