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// Copyright 2017 The Chromium Authors
// 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_WTF_CONSTRUCT_TRAITS_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_CONSTRUCT_TRAITS_H_
#include "base/containers/span.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/blink/renderer/platform/wtf/type_traits.h"
#include "third_party/blink/renderer/platform/wtf/vector_traits.h"
namespace WTF {
// ConstructTraits is used to construct elements in WTF collections.
// All in-place constructions that may assign Oilpan objects must be
// dispatched through ConstructAndNotifyElement.
template <typename T, typename Traits, typename Allocator>
class ConstructTraits {
STATIC_ONLY(ConstructTraits);
public:
// Construct a single element that would otherwise be constructed using
// placement new.
template <typename... Args>
static T* Construct(void* location, Args&&... args) {
return ::new (base::NotNullTag::kNotNull, location)
T(std::forward<Args>(args)...);
}
// After constructing elements using memcopy or memmove (or similar)
// |NotifyNewElement| needs to be called to propagate that information.
static void NotifyNewElement(T* element) {
Allocator::template NotifyNewObject<T, Traits>(element);
}
template <typename... Args>
static T* ConstructAndNotifyElement(void* location, Args&&... args) {
T* object = Construct(location, std::forward<Args>(args)...);
NotifyNewElement(object);
return object;
}
static void NotifyNewElements(base::span<T> elements) {
if (elements.empty()) {
return;
}
Allocator::template NotifyNewObjects<T, Traits>(elements);
}
};
} // namespace WTF
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_CONSTRUCT_TRAITS_H_
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