sync with N3126

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@113101 91177308-0d34-0410-b5e6-96231b3b80d8

test/containers/container.adaptors/queue/queue.special/swap.pass.cpp

@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <queue>
+
+// template <class T, class Container>
+//   void swap(queue<T, Container>& x, queue<T, Container>& y);
+
+#include <queue>
+#include <cassert>
+
+template <class C>
+C
+make(int n)
+{
+    C c;
+    for (int i = 0; i < n; ++i)
+        c.push(i);
+    return c;
+}
+
+int main()
+{
+    std::queue<int> q1 = make<std::queue<int> >(5);
+    std::queue<int> q2 = make<std::queue<int> >(10);
+    std::queue<int> q1_save = q1;
+    std::queue<int> q2_save = q2;
+    swap(q1, q2);
+    assert(q1 == q2_save);
+    assert(q2 == q1_save);
+}