compute-runtime/unit_tests/helpers/variable_backup.h

/*
 * Copyright (c) 2017, Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#pragma once

template <typename T>
class VariableBackup {
  public:
    VariableBackup(T *ptr) : pValue(ptr) {
        oldValue = *ptr;
    }
    VariableBackup(T *ptr, T &&newValue) : pValue(ptr) {
        oldValue = *ptr;
        *pValue = newValue;
    }
    VariableBackup(T *ptr, T &newValue) : pValue(ptr) {
        oldValue = *ptr;
        *pValue = newValue;
    }
    ~VariableBackup() {
        *pValue = oldValue;
    }
    void operator=(const T &val) {
        *pValue = val;
    }

  private:
    T oldValue;
    T *pValue;
};