Implement N3672, optional<T>.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@189772 91177308-0d34-0410-b5e6-96231b3b80d8
2013-09-02 20:30:37 +00:00
parent c64c980140
commit 01afa5c6e4
65 changed files with 4535 additions and 4 deletions
--- a/test/utilities/optional/optional.object/optional.object.observe/bool.pass.cpp
+++ b/test/utilities/optional/optional.object/optional.object.observe/bool.pass.cpp
@@ -0,0 +1,30 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <optional>
+
+// constexpr explicit optional<T>::operator bool() const noexcept;
+
+#include <optional>
+#include <type_traits>
+#include <cassert>
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+    {
+        constexpr std::optional<int> opt;
+        static_assert(!opt, "");
+    }
+    {
+        constexpr std::optional<int> opt(0);
+        static_assert(opt, "");
+    }
+#endif  // _LIBCPP_STD_VER > 11
+}