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/**********************************************************************
* $Id$
*
* 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 */
/************************************************************************/
/**
* The class use the destructor to automatically close the resource.
* Example:
* GDALDatasetH hDset = GDALOpen(path,GA_ReadOnly);
* CPLAutoClose<GDALDatasetH,void(*)(void*)>
* autoclosehDset(hDset,GDALClose); Or: GDALDatasetH hDset =
* GDALOpen(path,GA_ReadOnly); CPL_AUTO_CLOSE_WARP(hDset,GDALClose);
*/
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:
/**
* @brief Constructor.
* @param ptr Pointer to the resource object.
* @param dt Resource release(close) function.
*/
explicit CPLAutoClose(_Ty &ptr, _Dx dt)
: m_ResourcePtr(ptr), m_CloseFunc(dt)
{
}
/**
* @brief Destructor.
*/
~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 */
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