xpcom/glue/AutoRestore.h@6474c204b198 (annotated)
xpcom/glue/AutoRestore.h
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | /* functions for restoring saved values at the end of a C++ scope */ |
| michael@0 | 7 | |
| michael@0 | 8 | #ifndef mozilla_AutoRestore_h_ |
| michael@0 | 9 | #define mozilla_AutoRestore_h_ |
| michael@0 | 10 | |
| michael@0 | 11 | #include "mozilla/Attributes.h" // MOZ_STACK_CLASS |
| michael@0 | 12 | #include "mozilla/GuardObjects.h" |
| michael@0 | 13 | |
| michael@0 | 14 | namespace mozilla { |
| michael@0 | 15 | |
| michael@0 | 16 | /** |
| michael@0 | 17 | * Save the current value of a variable and restore it when the object |
| michael@0 | 18 | * goes out of scope. For example: |
| michael@0 | 19 | * { |
| michael@0 | 20 | * AutoRestore<bool> savePainting(mIsPainting); |
| michael@0 | 21 | * mIsPainting = true; |
| michael@0 | 22 | * |
| michael@0 | 23 | * // ... your code here ... |
| michael@0 | 24 | * |
| michael@0 | 25 | * // mIsPainting is reset to its old value at the end of this block |
| michael@0 | 26 | * } |
| michael@0 | 27 | */ |
| michael@0 | 28 | template <class T> |
| michael@0 | 29 | class MOZ_STACK_CLASS AutoRestore |
| michael@0 | 30 | { |
| michael@0 | 31 | private: |
| michael@0 | 32 | T& mLocation; |
| michael@0 | 33 | T mValue; |
| michael@0 | 34 | MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER |
| michael@0 | 35 | public: |
| michael@0 | 36 | AutoRestore(T& aValue MOZ_GUARD_OBJECT_NOTIFIER_PARAM) |
| michael@0 | 37 | : mLocation(aValue), mValue(aValue) |
| michael@0 | 38 | { |
| michael@0 | 39 | MOZ_GUARD_OBJECT_NOTIFIER_INIT; |
| michael@0 | 40 | } |
| michael@0 | 41 | ~AutoRestore() { mLocation = mValue; } |
| michael@0 | 42 | }; |
| michael@0 | 43 | |
| michael@0 | 44 | } // namespace mozilla |
| michael@0 | 45 | |
| michael@0 | 46 | #endif /* !defined(mozilla_AutoRestore_h_) */ |
