/* * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. *
*/
// A simplistic template providing a general save-restore pattern through a // local auto/stack object (scope). // template<typename T> class AutoSaveRestore : public StackObj { public:
AutoSaveRestore(T &loc) : _loc(loc) {
_value = loc;
}
~AutoSaveRestore() {
_loc = _value;
} private:
T &_loc;
T _value;
};
// A simplistic template providing a general modify-restore pattern through a // local auto/stack object (scope). // template<typename T> class AutoModifyRestore : private AutoSaveRestore<T> { public:
AutoModifyRestore(T &loc, T value) : AutoSaveRestore<T>(loc) {
loc = value;
}
};
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