// 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 "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 nullopt = base::nullopt;
constexpr base::in_place_t in_place = base::in_place;

}  // namespace WTF

using WTF::Optional;

#endif  // Optional_h