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| | | /* |
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| | | * Copyright (c) 2010-2019 Belledonne Communications SARL. |
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| | | * |
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| | | * This file is part of Liblinphone. |
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| | | * |
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| | | * This program is free software: you can redistribute it and/or modify |
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| | | * it under the terms of the GNU General Public License as published by |
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| | | * the Free Software Foundation, either version 3 of the License, or |
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| | | * (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, see <http://www.gnu.org/licenses/>. |
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| | | */ |
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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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| | | |
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| | | #ifndef _L_PRIVATE_ACCESS_H_ |
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| | | #define _L_PRIVATE_ACCESS_H_ |
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| | | |
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| | | #include <type_traits> |
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| | | |
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| | | #include "linphone/utils/utils.h" |
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| | | |
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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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| | | |
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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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| | | |
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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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| | | |
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| | | #endif // ifndef _L_PRIVATE_ACCESS_H_ |
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