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