/* * This program source code file is part of KiCad, a free EDA CAD application. * * Copyright (C) 2016 KiCad Developers, see AUTHORS.txt for contributors. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program 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 for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, you may find one here: * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html * or you may search the http://www.gnu.org website for the version 2 license, * or you may write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */ #ifndef __SCOPED_SET_RESET_H #define __SCOPED_SET_RESET_H /** * @class SCOPED_SET_RESET * @brief RAII class that sets an value at construction and resets * it to the original value at destruction. * * @note There is no type deduction for template classes until C++17, \ * so you can't do this: * * int target = 0; * SCOPED_SET_RESET( target, 42 ); * * Instead, you can use a type alias, for example: * * using SCOPED_INT_SET_RESET = SCOPED_SET_RESET<int>; * int target = 0; * SCOPED_INT_SET_RESET( target , 42 ); */ template <typename VAL_TYPE> class SCOPED_SET_RESET { public: SCOPED_SET_RESET( VAL_TYPE& target, VAL_TYPE value ): m_target( target ) { m_original = target; m_target = value; } /** * Function ~SCOPED_SET_RESET * * Destruct the class, and return the target to its original * value. */ ~SCOPED_SET_RESET() { m_target = m_original; } private: VAL_TYPE m_original; VAL_TYPE& m_target; }; #endif // __SCOPED_SET_RESET_H