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// Copyright 2019 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_DISALLOW_NEW_WRAPPER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_DISALLOW_NEW_WRAPPER_H_
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/heap.h"
#include "third_party/blink/renderer/platform/heap/visitor.h"
namespace blink {
// DisallowNewWrapper wraps a disallow new type in a GarbageCollected class.
template <typename T>
class DisallowNewWrapper final
: public GarbageCollected<DisallowNewWrapper<T>> {
public:
explicit DisallowNewWrapper(const T& value) : value_(value) {
static_assert(WTF::IsDisallowNew<T>::value,
"T needs to be a disallow new type");
static_assert(WTF::IsTraceable<T>::value, "T needs to be traceable");
}
explicit DisallowNewWrapper(T&& value) : value_(std::forward<T>(value)) {
static_assert(WTF::IsDisallowNew<T>::value,
"T needs to be a disallow new type");
static_assert(WTF::IsTraceable<T>::value, "T needs to be traceable");
}
template <typename... Args>
explicit DisallowNewWrapper(Args&&... args)
: value_(std::forward<Args>(args)...) {
static_assert(WTF::IsDisallowNew<T>::value,
"T needs to be a disallow new type");
static_assert(WTF::IsTraceable<T>::value, "T needs to be traceable");
}
const T& Value() const { return value_; }
T& Value() { return value_; }
T&& TakeValue() { return std::move(value_); }
void Trace(Visitor* visitor) const { visitor->Trace(value_); }
private:
T value_;
};
// Wraps a disallow new type in a GarbageCollected class, making it possible to
// be referenced off heap from a Persistent.
template <typename T>
DisallowNewWrapper<T>* WrapDisallowNew(const T& value) {
return MakeGarbageCollected<DisallowNewWrapper<T>>(value);
}
template <typename T>
DisallowNewWrapper<T>* WrapDisallowNew(T&& value) {
return MakeGarbageCollected<DisallowNewWrapper<T>>(std::forward<T>(value));
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_DISALLOW_NEW_WRAPPER_H_
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