[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_exception_at_thread_exit.pass.cpp

@@ -0,0 +1,42 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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_exception_at_thread_exit(exception_ptr p);
+
+#include <future>
+#include <cassert>
+
+void func(std::promise<int>& p)
+{
+    const int i = 5;
+    p.set_exception_at_thread_exit(std::make_exception_ptr(3));
+}
+
+int main()
+{
+    {
+        typedef int T;
+        std::promise<T> p;
+        std::future<T> f = p.get_future();
+        std::thread(func, std::move(p)).detach();
+        try
+        {
+            f.get();
+            assert(false);
+        }
+        catch (int i)
+        {
+            assert(i == 3);
+        }
+    }
+}