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48 lines
1.6 KiB
C
48 lines
1.6 KiB
C
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// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_SCOPED_ENVIRONMENT_VARIABLE_OVERRIDE_H_
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#define BASE_SCOPED_ENVIRONMENT_VARIABLE_OVERRIDE_H_
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#include <memory>
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#include <string>
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#include "base/base_export.h"
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namespace base {
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class Environment;
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// Helper class to override |variable_name| environment variable to |value| for
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// the lifetime of this class. Upon destruction, the previous value is restored.
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class BASE_EXPORT ScopedEnvironmentVariableOverride final {
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public:
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ScopedEnvironmentVariableOverride(const std::string& variable_name,
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const std::string& value);
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// Unset the variable.
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explicit ScopedEnvironmentVariableOverride(const std::string& variable_name);
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ScopedEnvironmentVariableOverride(ScopedEnvironmentVariableOverride&&);
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ScopedEnvironmentVariableOverride& operator=(
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ScopedEnvironmentVariableOverride&&);
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~ScopedEnvironmentVariableOverride();
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base::Environment* GetEnv() { return environment_.get(); }
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bool IsOverridden() { return overridden_; }
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bool WasSet() { return was_set_; }
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private:
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ScopedEnvironmentVariableOverride(const std::string& variable_name,
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const std::string& value,
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bool unset_var);
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std::unique_ptr<Environment> environment_;
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std::string variable_name_;
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bool overridden_;
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bool was_set_;
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std::string old_value_;
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};
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} // namespace base
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#endif // BASE_SCOPED_ENVIRONMENT_VARIABLE_OVERRIDE_H_
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