scoped_set_env.h (1187B)
1 // 2 // Copyright 2019 The Abseil Authors. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // https://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #ifndef ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_ 18 #define ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_ 19 20 #include <string> 21 22 #include "absl/base/config.h" 23 24 namespace absl { 25 ABSL_NAMESPACE_BEGIN 26 namespace base_internal { 27 28 class ScopedSetEnv { 29 public: 30 ScopedSetEnv(const char* var_name, const char* new_value); 31 ~ScopedSetEnv(); 32 33 private: 34 std::string var_name_; 35 std::string old_value_; 36 37 // True if the environment variable was initially not set. 38 bool was_unset_; 39 }; 40 41 } // namespace base_internal 42 ABSL_NAMESPACE_END 43 } // namespace absl 44 45 #endif // ABSL_BASE_INTERNAL_SCOPED_SET_ENV_H_