v8  10.1.124 (node 18.2.0)
V8 is Google's open source JavaScript engine
sentinel-pointer.h
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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_SENTINEL_POINTER_H_
6 #define INCLUDE_CPPGC_SENTINEL_POINTER_H_
7 
8 #include <cstdint>
9 
10 namespace cppgc {
11 namespace internal {
12 
13 // Special tag type used to denote some sentinel member. The semantics of the
14 // sentinel is defined by the embedder.
16  template <typename T>
17  operator T*() const {
18  static constexpr intptr_t kSentinelValue = 1;
19  return reinterpret_cast<T*>(kSentinelValue);
20  }
21  // Hidden friends.
22  friend bool operator==(SentinelPointer, SentinelPointer) { return true; }
23  friend bool operator!=(SentinelPointer, SentinelPointer) { return false; }
24 };
25 
26 } // namespace internal
27 
29 
30 } // namespace cppgc
31 
32 #endif // INCLUDE_CPPGC_SENTINEL_POINTER_H_