Abseil Common Libraries (C++) (grcp 依赖)
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51 lines
1.6 KiB
51 lines
1.6 KiB
// Copyright 2018 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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#ifndef ABSL_BASE_INTERNAL_HIDE_PTR_H_ |
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#define ABSL_BASE_INTERNAL_HIDE_PTR_H_ |
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#include <cstdint> |
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#include "absl/base/config.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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namespace base_internal { |
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// Arbitrary value with high bits set. Xor'ing with it is unlikely |
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// to map one valid pointer to another valid pointer. |
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constexpr uintptr_t HideMask() { |
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return (uintptr_t{0xF03A5F7BU} << (sizeof(uintptr_t) - 4) * 8) | 0xF03A5F7BU; |
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} |
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// Hide a pointer from the leak checker. For internal use only. |
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// Differs from absl::IgnoreLeak(ptr) in that absl::IgnoreLeak(ptr) causes ptr |
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// and all objects reachable from ptr to be ignored by the leak checker. |
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template <class T> |
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inline uintptr_t HidePtr(T* ptr) { |
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return reinterpret_cast<uintptr_t>(ptr) ^ HideMask(); |
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} |
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// Return a pointer that has been hidden from the leak checker. |
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// For internal use only. |
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template <class T> |
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inline T* UnhidePtr(uintptr_t hidden) { |
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return reinterpret_cast<T*>(hidden ^ HideMask()); |
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} |
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} // namespace base_internal |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_BASE_INTERNAL_HIDE_PTR_H_
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