chromium/base/auto_reset.h

// Copyright 2011 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_AUTO_RESET_H_
#define BASE_AUTO_RESET_H_

#include <utility>

#include "base/check_op.h"
#include "base/memory/raw_ptr_exclusion.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 [[maybe_unused, nodiscard]] AutoReset { … };

}  // namespace base

#endif  // BASE_AUTO_RESET_H_