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63 lines
2.5 KiB
C++
63 lines
2.5 KiB
C++
/*
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* private-access.h
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* Copyright (C) 2010-2018 Belledonne Communications SARL
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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// =============================================================================
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// Tools to get/set private data of Cpp objects.
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//
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// See: https://bloglitb.blogspot.fr/2011/12/access-to-private-members-safer.html
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// See: http://en.cppreference.com/w/cpp/language/adl
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// See: http://en.cppreference.com/w/cpp/language/friend
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// =============================================================================
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#ifndef _L_PRIVATE_ACCESS_H_
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#define _L_PRIVATE_ACCESS_H_
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#include <type_traits>
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#include "linphone/utils/utils.h"
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#define L_INTERNAL_STRUCT_L_ATTR_GET(CLASS, ATTR_NAME) AttrGet ## _ ## CLASS ## _ ## ATTR_NAME
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#define L_INTERNAL_STRUCT_ATTR_SPY(ATTR_NAME) AttrSpy ## _ ## ATTR_NAME
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#define L_ENABLE_ATTR_ACCESS(CLASS, ATTR_TYPE, ATTR_NAME) \
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template<typename AttrSpy, ATTR_TYPE CLASS::*Attr> \
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struct L_INTERNAL_STRUCT_L_ATTR_GET(CLASS, ATTR_NAME) { \
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friend constexpr ATTR_TYPE (CLASS::*get(AttrSpy *)) { \
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return Attr; \
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} \
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}; \
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template<typename T> \
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struct L_INTERNAL_STRUCT_ATTR_SPY(ATTR_NAME); \
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template<> \
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struct L_INTERNAL_STRUCT_ATTR_SPY(ATTR_NAME)<CLASS> { \
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friend constexpr ATTR_TYPE (CLASS::*get(L_INTERNAL_STRUCT_ATTR_SPY(ATTR_NAME)<CLASS> *)); \
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}; \
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template struct L_INTERNAL_STRUCT_L_ATTR_GET(CLASS, ATTR_NAME)< \
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L_INTERNAL_STRUCT_ATTR_SPY(ATTR_NAME)<CLASS>, \
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&CLASS::ATTR_NAME \
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>;
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// Warning: Allow to modify const data.
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// Returns a ref to `ATTR_NAME`.
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#define L_ATTR_GET(OBJECT, ATTR_NAME) \
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(const_cast<std::remove_pointer<std::decay<decltype(OBJECT)>::type>::type *>(LinphonePrivate::Utils::getPtr(OBJECT)))->*get( \
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static_cast<L_INTERNAL_STRUCT_ATTR_SPY(ATTR_NAME)<std::remove_pointer<std::decay<decltype(OBJECT)>::type>::type> *>(nullptr) \
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)
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#endif // ifndef _L_PRIVATE_ACCESS_H_
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