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The C and C++ Include Header Files

cat -n /usr/include/node/cppgc/object-size-trait.h

     1	// Copyright 2021 the V8 project authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style license that can be
     3	// found in the LICENSE file.
     4	
     5	#ifndef INCLUDE_CPPGC_OBJECT_SIZE_TRAIT_H_
     6	#define INCLUDE_CPPGC_OBJECT_SIZE_TRAIT_H_
     7	
     8	#include <cstddef>
     9	
    10	#include "cppgc/type-traits.h"
    11	#include "v8config.h"  // NOLINT(build/include_directory)
    12	
    13	namespace cppgc {
    14	
    15	namespace internal {
    16	
    17	struct V8_EXPORT BaseObjectSizeTrait {
    18	 protected:
    19	  static size_t GetObjectSizeForGarbageCollected(const void*);
    20	  static size_t GetObjectSizeForGarbageCollectedMixin(const void*);
    21	};
    22	
    23	}  // namespace internal
    24	
    25	namespace subtle {
    26	
    27	/**
    28	 * Trait specifying how to get the size of an object that was allocated using
    29	 * `MakeGarbageCollected()`. Also supports querying the size with an inner
    30	 * pointer to a mixin.
    31	 */
    32	template <typename T, bool = IsGarbageCollectedMixinTypeV<T>>
    33	struct ObjectSizeTrait;
    34	
    35	template <typename T>
    36	struct ObjectSizeTrait<T, false> : cppgc::internal::BaseObjectSizeTrait {
    37	  static_assert(sizeof(T), "T must be fully defined");
    38	  static_assert(IsGarbageCollectedTypeV<T>,
    39	                "T must be of type GarbageCollected or GarbageCollectedMixin");
    40	
    41	  static size_t GetSize(const T& object) {
    42	    return GetObjectSizeForGarbageCollected(&object);
    43	  }
    44	};
    45	
    46	template <typename T>
    47	struct ObjectSizeTrait<T, true> : cppgc::internal::BaseObjectSizeTrait {
    48	  static_assert(sizeof(T), "T must be fully defined");
    49	
    50	  static size_t GetSize(const T& object) {
    51	    return GetObjectSizeForGarbageCollectedMixin(&object);
    52	  }
    53	};
    54	
    55	}  // namespace subtle
    56	}  // namespace cppgc
    57	
    58	#endif  // INCLUDE_CPPGC_OBJECT_SIZE_TRAIT_H_