Abseil Common Libraries (C++) (grcp 依赖)
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43 lines
1.3 KiB
43 lines
1.3 KiB
// Copyright 2017 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_ERRNO_SAVER_H_ |
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#define ABSL_BASE_INTERNAL_ERRNO_SAVER_H_ |
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#include <cerrno> |
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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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// `ErrnoSaver` captures the value of `errno` upon construction and restores it |
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// upon deletion. It is used in low-level code and must be super fast. Do not |
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// add instrumentation, even in debug modes. |
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class ErrnoSaver { |
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public: |
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ErrnoSaver() : saved_errno_(errno) {} |
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~ErrnoSaver() { errno = saved_errno_; } |
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int operator()() const { return saved_errno_; } |
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private: |
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const int saved_errno_; |
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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_ERRNO_SAVER_H_
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