74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
/**********************************************************************
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* $Id$
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*
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* Name: cpl_auto_close.h
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* Project: CPL - Common Portability Library
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* Purpose: CPL Auto Close handling
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* Author: Liu Yimin, ymwh@foxmail.com
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*
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**********************************************************************
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* Copyright (c) 2018, Liu Yimin
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*
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* SPDX-License-Identifier: MIT
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****************************************************************************/
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#ifndef CPL_AUTO_CLOSE_H_INCLUDED
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#define CPL_AUTO_CLOSE_H_INCLUDED
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#if defined(__cplusplus)
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#include <type_traits>
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/************************************************************************/
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/* CPLAutoClose */
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/************************************************************************/
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/**
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* The class use the destructor to automatically close the resource.
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* Example:
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* GDALDatasetH hDset = GDALOpen(path,GA_ReadOnly);
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* CPLAutoClose<GDALDatasetH,void(*)(void*)>
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* autoclosehDset(hDset,GDALClose); Or: GDALDatasetH hDset =
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* GDALOpen(path,GA_ReadOnly); CPL_AUTO_CLOSE_WARP(hDset,GDALClose);
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*/
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template <typename _Ty, typename _Dx> class CPLAutoClose
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{
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static_assert(!std::is_const<_Ty>::value && std::is_pointer<_Ty>::value,
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"_Ty must is pointer type,_Dx must is function type");
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private:
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_Ty &m_ResourcePtr;
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_Dx m_CloseFunc;
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private:
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CPLAutoClose(const CPLAutoClose &) = delete;
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void operator=(const CPLAutoClose &) = delete;
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public:
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/**
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* @brief Constructor.
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* @param ptr Pointer to the resource object.
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* @param dt Resource release(close) function.
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*/
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explicit CPLAutoClose(_Ty &ptr, _Dx dt)
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: m_ResourcePtr(ptr), m_CloseFunc(dt)
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{
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}
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/**
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* @brief Destructor.
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*/
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~CPLAutoClose()
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{
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if (m_ResourcePtr && m_CloseFunc)
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m_CloseFunc(m_ResourcePtr);
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}
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};
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#define CPL_AUTO_CLOSE_WARP(hObject, closeFunc) \
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CPLAutoClose<decltype(hObject), decltype(closeFunc) *> \
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tAutoClose##hObject(hObject, closeFunc)
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#endif /* __cplusplus */
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#endif /* CPL_AUTO_CLOSE_H_INCLUDED */
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