Getting started on <future>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@112061 91177308-0d34-0410-b5e6-96231b3b80d8

test/thread/futures/futures.errors/make_error_code.pass.cpp

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+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <future>
+
+// class error_code
+
+// error_code make_error_code(future_errc e);
+
+#include <future>
+#include <cassert>
+
+int main()
+{
+    {
+        std::error_code ec = make_error_code(std::future_errc::broken_promise);
+        assert(ec.value() == static_cast<int>(std::future_errc::broken_promise));
+        assert(ec.category() == std::future_category());
+    }
+}