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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,52 @@ | ||
| // 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. | ||
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| #ifndef BASE_AUTO_RESET_H_ | ||
| #define BASE_AUTO_RESET_H_ | ||
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| #include <utility> | ||
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| // 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. | ||
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| namespace base { | ||
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| template <typename T> | ||
| class AutoReset { | ||
| public: | ||
| template <typename U> | ||
| AutoReset(T* scoped_variable, U&& new_value) | ||
| : scoped_variable_(scoped_variable), | ||
| original_value_( | ||
| std::exchange(*scoped_variable_, std::forward<U>(new_value))) {} | ||
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| AutoReset(AutoReset&& other) | ||
| : scoped_variable_(std::exchange(other.scoped_variable_, nullptr)), | ||
| original_value_(std::move(other.original_value_)) {} | ||
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| AutoReset& operator=(AutoReset&& rhs) { | ||
| scoped_variable_ = std::exchange(rhs.scoped_variable_, nullptr); | ||
| original_value_ = std::move(rhs.original_value_); | ||
| return *this; | ||
| } | ||
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| ~AutoReset() { | ||
| if (scoped_variable_) | ||
| *scoped_variable_ = std::move(original_value_); | ||
| } | ||
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| private: | ||
| T* scoped_variable_; | ||
| T original_value_; | ||
| }; | ||
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| } // namespace base | ||
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| #endif // BASE_AUTO_RESET_H_ |
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