On 29/09/16 17:22 +0300, Ville Voutilainen wrote:
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/optional/observers/6.cc
@@ -0,0 +1,39 @@
+// { dg-options "-std=gnu++17" }
+// { dg-do run }
+
+// Copyright (C) 2016 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a moved_to of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <optional>
+#include <testsuite_hooks.h>
+
+struct Y
+{
+ constexpr int test() & {return 7;}
+};
+
+constexpr int
+test()
+{
+ std::optional<Y> opt{Y{}};
+ return opt.value().test();
+}
+
+int main()
+{
+ static_assert(test());
+}
Can this second test use { dg-do compile } instead?
OK for trunk either way.
