The Tor Browser / file comparison
comparison: xpcom/glue/AutoRestore.h
xpcom/glue/AutoRestore.h
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| -1:000000000000 | 0:4119a393e781 |
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| 1 /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* functions for restoring saved values at the end of a C++ scope */ | |
| 7 | |
| 8 #ifndef mozilla_AutoRestore_h_ | |
| 9 #define mozilla_AutoRestore_h_ | |
| 10 | |
| 11 #include "mozilla/Attributes.h" // MOZ_STACK_CLASS | |
| 12 #include "mozilla/GuardObjects.h" | |
| 13 | |
| 14 namespace mozilla { | |
| 15 | |
| 16 /** | |
| 17 * Save the current value of a variable and restore it when the object | |
| 18 * goes out of scope. For example: | |
| 19 * { | |
| 20 * AutoRestore<bool> savePainting(mIsPainting); | |
| 21 * mIsPainting = true; | |
| 22 * | |
| 23 * // ... your code here ... | |
| 24 * | |
| 25 * // mIsPainting is reset to its old value at the end of this block | |
| 26 * } | |
| 27 */ | |
| 28 template <class T> | |
| 29 class MOZ_STACK_CLASS AutoRestore | |
| 30 { | |
| 31 private: | |
| 32 T& mLocation; | |
| 33 T mValue; | |
| 34 MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER | |
| 35 public: | |
| 36 AutoRestore(T& aValue MOZ_GUARD_OBJECT_NOTIFIER_PARAM) | |
| 37 : mLocation(aValue), mValue(aValue) | |
| 38 { | |
| 39 MOZ_GUARD_OBJECT_NOTIFIER_INIT; | |
| 40 } | |
| 41 ~AutoRestore() { mLocation = mValue; } | |
| 42 }; | |
| 43 | |
| 44 } // namespace mozilla | |
| 45 | |
| 46 #endif /* !defined(mozilla_AutoRestore_h_) */ |
