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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 01:47:29 +0000 |
commit | 0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d (patch) | |
tree | a31f07c9bcca9d56ce61e9a1ffd30ef350d513aa /xpcom/base/AutoRestore.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.tar.xz firefox-esr-0ebf5bdf043a27fd3dfb7f92e0cb63d88954c44d.zip |
Adding upstream version 115.8.0esr.upstream/115.8.0esr
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'xpcom/base/AutoRestore.h')
-rw-r--r-- | xpcom/base/AutoRestore.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/xpcom/base/AutoRestore.h b/xpcom/base/AutoRestore.h new file mode 100644 index 0000000000..fc585da14b --- /dev/null +++ b/xpcom/base/AutoRestore.h @@ -0,0 +1,42 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* functions for restoring saved values at the end of a C++ scope */ + +#ifndef mozilla_AutoRestore_h_ +#define mozilla_AutoRestore_h_ + +#include "mozilla/Attributes.h" // MOZ_STACK_CLASS + +namespace mozilla { + +/** + * Save the current value of a variable and restore it when the object + * goes out of scope. For example: + * { + * AutoRestore<bool> savePainting(mIsPainting); + * mIsPainting = true; + * + * // ... your code here ... + * + * // mIsPainting is reset to its old value at the end of this block + * } + */ +template <class T> +class MOZ_RAII AutoRestore { + private: + T& mLocation; + T mValue; + + public: + explicit AutoRestore(T& aValue) : mLocation(aValue), mValue(aValue) {} + ~AutoRestore() { mLocation = mValue; } + T SavedValue() const { return mValue; } +}; + +} // namespace mozilla + +#endif /* !defined(mozilla_AutoRestore_h_) */ |