cpl_auto_close.h

/**********************************************************************
 * $Id$
 *
 * Name:     cpl_auto_close.h
 * Project:  CPL - Common Portability Library
 * Purpose:  CPL Auto Close handling
 * Author:   Liu Yimin, ymwh@foxmail.com
 *
 **********************************************************************
 * Copyright (c) 2018, Liu Yimin
 *
 * 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.
 ****************************************************************************/
 
#ifndef CPL_AUTO_CLOSE_H_INCLUDED
#define CPL_AUTO_CLOSE_H_INCLUDED
 
#if defined(__cplusplus)
#include <type_traits>
 
/************************************************************************/
/*                           CPLAutoClose                               */
/************************************************************************/
 
template <typename _Ty, typename _Dx> class CPLAutoClose
{
    static_assert(!std::is_const<_Ty>::value && std::is_pointer<_Ty>::value,
                  "_Ty must is pointer type,_Dx must is function type");
 
  private:
    _Ty &m_ResourcePtr;
    _Dx m_CloseFunc;
 
  private:
    CPLAutoClose(const CPLAutoClose &) = delete;
    void operator=(const CPLAutoClose &) = delete;
 
  public:
    explicit CPLAutoClose(_Ty &ptr, _Dx dt)
        : m_ResourcePtr(ptr), m_CloseFunc(dt)
    {
    }
 
    ~CPLAutoClose()
    {
        if (m_ResourcePtr && m_CloseFunc)
            m_CloseFunc(m_ResourcePtr);
    }
};
 
#define CPL_AUTO_CLOSE_WARP(hObject, closeFunc)                                \
    CPLAutoClose<decltype(hObject), decltype(closeFunc) *>                     \
        tAutoClose##hObject(hObject, closeFunc)
 
#endif /* __cplusplus */
 
#endif /* CPL_AUTO_CLOSE_H_INCLUDED */