1 files changed, 57 insertions, 0 deletions
diff --git a/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.algorithm/swap.pass.cpp b/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.algorithm/swap.pass.cpp
new file mode 100644
index 00000000000..476ca0c4ed2
--- /dev/null
+++ b/libcxx/test/std/thread/thread.threads/thread.thread.class/thread.thread.algorithm/swap.pass.cpp
@@ -0,0 +1,57 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+//
+// UNSUPPORTED: libcpp-has-no-threads
+
+// <thread>
+
+// class thread
+
+// void swap(thread& x, thread& y);
+
+#include <thread>
+#include <new>
+#include <cstdlib>
+#include <cassert>
+
+class G
+{
+    int alive_;
+public:
+    static int n_alive;
+    static bool op_run;
+
+    G() : alive_(1) {++n_alive;}
+    G(const G& g) : alive_(g.alive_) {++n_alive;}
+    ~G() {alive_ = 0; --n_alive;}
+
+    void operator()()
+    {
+        assert(alive_ == 1);
+        assert(n_alive >= 1);
+        op_run = true;
+    }
+};
+
+int G::n_alive = 0;
+bool G::op_run = false;
+
+int main()
+{
+    {
+        std::thread t0((G()));
+        std::thread::id id0 = t0.get_id();
+        std::thread t1;
+        std::thread::id id1 = t1.get_id();
+        swap(t0, t1);
+        assert(t0.get_id() == id1);
+        assert(t1.get_id() == id0);
+        t1.join();
+    }
+}