Abseil Common Libraries (C++) (grcp 依赖)
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42 lines
1.1 KiB
42 lines
1.1 KiB
6 years ago
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// Copyright 2019 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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//
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#ifndef ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
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#define ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
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#include <string>
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namespace absl {
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namespace base_internal {
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class ScopedSetEnv {
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public:
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ScopedSetEnv(const char* var_name, const char* new_value);
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~ScopedSetEnv();
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private:
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std::string var_name_;
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std::string old_value_;
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// True if the environment variable was initially not set.
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bool was_unset_;
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};
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} // namespace base_internal
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} // namespace absl
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#endif // ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_
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