[futures.promise]. Depends on rvalue-ref support to work 100%.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@112388 91177308-0d34-0410-b5e6-96231b3b80d8

test/thread/futures/futures.promise/set_rvalue_at_thread_exit.pass.cpp

@@ -0,0 +1,39 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <future>
+
+// class promise<R>
+
+// void promise::set_value_at_thread_exit(R&& r);
+
+#include <future>
+#include <memory>
+#include <cassert>
+
+#ifdef _LIBCPP_MOVE
+
+void func(std::promise<std::unique_ptr<int>>& p)
+{
+    p.set_value_at_thread_exit(std::unique_ptr<int>(new int(5)));
+}
+
+#endif  // _LIBCPP_MOVE
+
+int main()
+{
+#ifdef _LIBCPP_MOVE
+    {
+        std::promise<std::unique_ptr<int>> p;
+        std::future<std::unique_ptr<int>> f = p.get_future();
+        std::thread(func, std::move(p)).detach();
+        assert(*f.get() == 5);
+    }
+#endif  // _LIBCPP_MOVE
+}