blob: 0ab0af7bb21267975270888f9702a2272df0c9e8 [file] [log] [blame]
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <utility>
#include "base/macros.h"
// base::AutoReset<> is useful for setting a variable to a new value only within
// a particular scope. An base::AutoReset<> object resets a variable to its
// original value upon destruction, making it an alternative to writing
// "var = false;" or "var = old_val;" at all of a block's exit points.
// This should be obvious, but note that an base::AutoReset<> instance should
// have a shorter lifetime than its scoped_variable, to prevent invalid memory
// writes when the base::AutoReset<> object is destroyed.
namespace base {
template<typename T>
class AutoReset {
AutoReset(T* scoped_variable, T new_value)
: scoped_variable_(scoped_variable),
original_value_(std::move(*scoped_variable)) {
*scoped_variable_ = std::move(new_value);
AutoReset(AutoReset&& other)
: scoped_variable_(other.scoped_variable_),
original_value_(std::move(other.original_value_)) {
other.scoped_variable_ = nullptr;
~AutoReset() {
if (scoped_variable_)
*scoped_variable_ = std::move(original_value_);
AutoReset& operator=(AutoReset&& rhs) {
if (this != &rhs) {
scoped_variable_ = rhs.scoped_variable_;
rhs.scoped_variable_ = nullptr;
original_value_ = std::move(rhs.original_value_);
return *this;
T* scoped_variable_;
T original_value_;
} // namespace base
#endif // BASE_AUTO_RESET_H_