forked from mirrors/linphone-iphone
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/*
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* traits.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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#ifndef _L_TRAITS_H_
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#define _L_TRAITS_H_
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#include "linphone/utils/general.h"
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// =============================================================================
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LINPHONE_BEGIN_NAMESPACE
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namespace Private {
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// See: http://en.cppreference.com/w/cpp/types/void_t
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template<typename... T> struct MakeVoid {
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typedef void type;
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};
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template<typename... T>
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using void_t = typename MakeVoid<T...>::type;
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template<typename T, typename U = void>
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struct IsMapContainerImpl : std::false_type {};
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template<typename T>
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struct IsMapContainerImpl<
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T,
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void_t<
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typename T::key_type,
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typename T::mapped_type,
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decltype(std::declval<T&>()[std::declval<const typename T::key_type&>()])
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>
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> : std::true_type {};
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};
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// Check if a type is a std container like map, unordered_map...
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template<typename T>
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struct IsMapContainer : Private::IsMapContainerImpl<T>::type {};
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LINPHONE_END_NAMESPACE
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#endif // ifndef _L_TRAITS_H_
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