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85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
/* Copyright (C) 2015
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* swift project Community / Contributors
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*
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* This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
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* directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
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* including this file, may be copied, modified, propagated, or distributed except according to the terms
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* contained in the LICENSE file.
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*/
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//! \file
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#ifndef BLACKMISC_INHERITANCE_TRAITS_H
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#define BLACKMISC_INHERITANCE_TRAITS_H
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#include "typetraits.h"
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#include <QMetaType>
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#include <type_traits>
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namespace BlackMisc
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{
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class CPropertyIndex;
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/*!
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* If T has a member typedef base_type, this trait will obtain it, otherwise void.
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*/
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template <typename T, typename = void_t<>>
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struct TBaseOf
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{
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using type = void; //!< void
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};
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//! \cond
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template <typename T>
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struct TBaseOf<T, void_t<typename T::base_type>>
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{
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using type = typename T::base_type; //!< T::base_type
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};
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//! \endcond
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/*!
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* It T has a member typedef base_type which is a registered metatype, this trait will obtain it, otherwise void.
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*/
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template <class T>
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struct TMetaBaseOf
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{
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//! Type of T::base_type, or void if not declared.
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using type = std::conditional_t<QMetaTypeId<typename TBaseOf<T>::type>::Defined, typename TBaseOf<T>::type, void>;
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};
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/*!
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* If T has a member typedef base_type which has a member propertyByIndex, this trait will obtain it, otherwise void.
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*/
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template <typename T, typename = void_t<>>
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struct TIndexBaseOf
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{
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using type = void; //!< void
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};
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//! \cond
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template <typename T>
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struct TIndexBaseOf<T, void_t<decltype(std::declval<typename T::base_type>().propertyByIndex(std::declval<CPropertyIndex>()))>>
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{
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using type = typename T::base_type; //!< T::base_type
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};
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//! \endcond
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/*!
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* Alias for typename TBaseOf<T>::type.
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*/
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template <class T>
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using TBaseOfT = typename TBaseOf<T>::type;
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/*!
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* Alias for typename TMetaBaseOf<T>::type.
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*/
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template <class T>
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using TMetaBaseOfT = typename TMetaBaseOf<T>::type;
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/*!
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* Alias for typename TIndexBaseOf<T>::type.
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*/
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template <class T>
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using TIndexBaseOfT = typename TIndexBaseOf<T>::type;
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}
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#endif
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