diff options
Diffstat (limited to 'base/auto_reset.h')
-rw-r--r-- | base/auto_reset.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/base/auto_reset.h b/base/auto_reset.h new file mode 100644 index 0000000..dd968ef --- /dev/null +++ b/base/auto_reset.h @@ -0,0 +1,35 @@ +// Copyright (c) 2009 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. + +#ifndef BASE_AUTO_RESET_H_ +#define BASE_AUTO_RESET_H_ + +#include "base/basictypes.h" + +// AutoReset is useful for setting a variable to some value only during a +// particular scope. If you have code that has to add "var = false;" or +// "var = old_var;" at all the exit points of a block, for example, you would +// benefit from using this instead. +// +// NOTE: Right now this is hardcoded to work on bools, since that covers all the +// cases where we've used it. It would be reasonable to turn it into a template +// class in the future. + +class AutoReset { + public: + explicit AutoReset(bool* scoped_variable, bool new_value) + : scoped_variable_(scoped_variable), + original_value_(*scoped_variable) { + *scoped_variable_ = new_value; + } + ~AutoReset() { *scoped_variable_ = original_value_; } + + private: + bool* scoped_variable_; + bool original_value_; + + DISALLOW_COPY_AND_ASSIGN(AutoReset); +}; + +#endif // BASE_AUTO_RESET_H_ |