scoped_set_reset.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright The 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, see <https://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <utility>

template <typename VAL_TYPE>
class SCOPED_SET_RESET
{
public:
    SCOPED_SET_RESET( VAL_TYPE& target, VAL_TYPE value ) :
            m_original( target ),
            m_target( target )
    {
        m_target = std::move( value );
    }

    SCOPED_SET_RESET( VAL_TYPE& target ) :
            m_original( target ),
            m_target( target )
    {
    }

    ~SCOPED_SET_RESET() { m_target = m_original; }
 
    // No copy operations allowed or the destructor might reset
    // the target to its original value multiple times.
 
    SCOPED_SET_RESET( SCOPED_SET_RESET const& ) = delete;
    SCOPED_SET_RESET& operator=( SCOPED_SET_RESET const& ) = delete;
 
private:
    VAL_TYPE  m_original;
    VAL_TYPE& m_target;
};
 

template <typename Func>
class SCOPED_EXECUTION
{
public:
    SCOPED_EXECUTION( Func initFunc, Func destroyFunc ) :
            m_initFunc( initFunc ), m_destroyFunc( destroyFunc )
    {
        m_initFunc();
    }
 
    // No copy operations allowed or the destructor might execute
    // the destroy function multiple times.
 
    SCOPED_EXECUTION( SCOPED_EXECUTION const& ) = delete;
    SCOPED_EXECUTION& operator=( SCOPED_EXECUTION const& ) = delete;
 
    ~SCOPED_EXECUTION() { m_destroyFunc(); }
 
private:
    Func m_initFunc;
    Func m_destroyFunc;
};