74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
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/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2016 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#ifndef __SCOPED_SET_RESET_H
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#define __SCOPED_SET_RESET_H
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/**
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* @class SCOPED_SET_RESET
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* @brief RAII class that sets an value at construction and resets
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* it to the original value at destruction.
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*
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* @note There is no type deduction for template classes until C++17, \
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* so you can't do this:
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*
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* int target = 0;
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* SCOPED_SET_RESET( target, 42 );
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*
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* Instead, you can use a type alias, for example:
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*
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* using SCOPED_INT_SET_RESET = SCOPED_SET_RESET<int>;
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* int target = 0;
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* SCOPED_INT_SET_RESET( target , 42 );
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*/
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template <typename VAL_TYPE>
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class SCOPED_SET_RESET
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{
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public:
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SCOPED_SET_RESET( VAL_TYPE& target,
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VAL_TYPE value ):
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m_target( target )
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{
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m_original = target;
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m_target = value;
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}
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/**
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* Function ~SCOPED_SET_RESET
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*
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* Destruct the class, and return the target to its original
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* value.
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*/
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~SCOPED_SET_RESET()
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{
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m_target = m_original;
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}
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private:
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VAL_TYPE m_original;
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VAL_TYPE& m_target;
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};
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#endif // __SCOPED_SET_RESET_H
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