00001 // 00002 // Copyright 2019 The Abseil Authors. 00003 // 00004 // Licensed under the Apache License, Version 2.0 (the "License"); 00005 // you may not use this file except in compliance with the License. 00006 // You may obtain a copy of the License at 00007 // 00008 // https://www.apache.org/licenses/LICENSE-2.0 00009 // 00010 // Unless required by applicable law or agreed to in writing, software 00011 // distributed under the License is distributed on an "AS IS" BASIS, 00012 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 // See the License for the specific language governing permissions and 00014 // limitations under the License. 00015 // 00016 00017 #ifndef ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_ 00018 #define ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_ 00019 00020 #include <string> 00021 00022 namespace absl { 00023 namespace base_internal { 00024 00025 class ScopedSetEnv { 00026 public: 00027 ScopedSetEnv(const char* var_name, const char* new_value); 00028 ~ScopedSetEnv(); 00029 00030 private: 00031 std::string var_name_; 00032 std::string old_value_; 00033 00034 // True if the environment variable was initially not set. 00035 bool was_unset_; 00036 }; 00037 00038 } // namespace base_internal 00039 } // namespace absl 00040 00041 #endif // ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_