| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef Optional_h |
| #define Optional_h |
| |
| #include "base/optional.h" |
| #include "platform/wtf/TypeTraits.h" |
| |
| namespace WTF { |
| |
| // WTF::Optional is base::Optional. See base/optional.h for documentation. |
| // |
| // A clang plugin enforces that garbage collected types are not allocated |
| // outside of the heap, similarly we enforce that one doesn't create garbage |
| // collected types nested inside an Optional. |
| template <typename T> |
| using Optional = typename std::enable_if<!IsGarbageCollectedType<T>::value, |
| base::Optional<T>>::type; |
| |
| constexpr base::nullopt_t kNullopt = base::nullopt; |
| constexpr base::in_place_t in_place = base::in_place; |
| |
| } // namespace WTF |
| |
| using WTF::Optional; |
| |
| #endif // Optional_h |
