57 lines
1.6 KiB
C
57 lines
1.6 KiB
C
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// Copyright 2021 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef INCLUDE_CPPGC_OBJECT_SIZE_TRAIT_H_
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#define INCLUDE_CPPGC_OBJECT_SIZE_TRAIT_H_
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#include "cppgc/type-traits.h"
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#include "v8config.h" // NOLINT(build/include_directory)
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namespace cppgc {
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namespace internal {
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struct V8_EXPORT BaseObjectSizeTrait {
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protected:
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static size_t GetObjectSizeForGarbageCollected(const void*);
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static size_t GetObjectSizeForGarbageCollectedMixin(const void*);
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};
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} // namespace internal
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namespace subtle {
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/**
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* Trait specifying how to get the size of an object that was allocated using
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* `MakeGarbageCollected()`. Also supports querying the size with an inner
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* pointer to a mixin.
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*/
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template <typename T, bool = IsGarbageCollectedMixinTypeV<T>>
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struct ObjectSizeTrait;
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template <typename T>
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struct ObjectSizeTrait<T, false> : cppgc::internal::BaseObjectSizeTrait {
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static_assert(sizeof(T), "T must be fully defined");
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static_assert(IsGarbageCollectedTypeV<T>,
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"T must be of type GarbageCollected or GarbageCollectedMixin");
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static size_t GetSize(const T& object) {
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return GetObjectSizeForGarbageCollected(&object);
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}
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};
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template <typename T>
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struct ObjectSizeTrait<T, true> : cppgc::internal::BaseObjectSizeTrait {
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static_assert(sizeof(T), "T must be fully defined");
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static size_t GetSize(const T& object) {
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return GetObjectSizeForGarbageCollectedMixin(&object);
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}
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};
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} // namespace subtle
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} // namespace cppgc
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#endif // INCLUDE_CPPGC_OBJECT_SIZE_TRAIT_H_
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