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46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* functions for restoring saved values at the end of a C++ scope */
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#ifndef mozilla_AutoRestore_h_
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#define mozilla_AutoRestore_h_
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#include "mozilla/GuardObjects.h"
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namespace mozilla {
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/**
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* Save the current value of a variable and restore it when the object
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* goes out of scope. For example:
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* {
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* AutoRestore<bool> savePainting(mIsPainting);
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* mIsPainting = true;
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*
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* // ... your code here ...
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*
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* // mIsPainting is reset to its old value at the end of this block
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* }
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*/
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template <class T>
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class NS_STACK_CLASS AutoRestore
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{
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private:
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T& mLocation;
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T mValue;
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
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public:
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AutoRestore(T& aValue MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
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: mLocation(aValue), mValue(aValue)
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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}
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~AutoRestore() { mLocation = mValue; }
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};
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} // namespace mozilla
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#endif /* !defined(mozilla_AutoRestore_h_) */
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