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78 lines
2.6 KiB
78 lines
2.6 KiB
3 days ago
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/****************************************************************************
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**
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** https://www.qxorm.com/
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** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
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**
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** This file is part of the QxOrm library
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any
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** damages arising from the use of this software
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**
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** Commercial Usage
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** Licensees holding valid commercial QxOrm licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Lionel Marty
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file 'license.gpl3.txt' included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met : http://www.gnu.org/copyleft/gpl.html
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**
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** If you are unsure which license is appropriate for your use, or
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** if you have questions regarding the use of this file, please contact :
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** contact@qxorm.com
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**
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****************************************************************************/
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#ifndef _QX_IS_PTR_BASE_OF_H_
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#define _QX_IS_PTR_BASE_OF_H_
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#ifdef _MSC_VER
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#pragma once
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#endif
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/*!
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* \file is_ptr_base_of.h
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* \author Lionel Marty
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* \ingroup QxTraits
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* \brief qx::trait::is_ptr_base_of<B, D>::value : return true if B and D are pointer type and (*B) is a base class of (*D) or if B and D are same type, otherwise return false
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*/
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namespace qx {
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namespace trait {
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/*!
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* \ingroup QxTraits
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* \brief qx::trait::is_ptr_base_of<B, D>::value : return true if B and D are pointer type and (*B) is a base class of (*D) or if B and D are same type, otherwise return false
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*/
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template <typename B, typename D>
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class is_ptr_base_of
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{
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private:
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template <typename V, typename W>
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static typename std::conditional<std::is_base_of<V, W>::value, char, int>::type removePtr(const volatile V * const volatile, const volatile W * const volatile);
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static int removePtr(...);
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static B b;
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static D d;
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public:
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enum { value = (std::is_pointer<B>::value && std::is_pointer<D>::value && (sizeof(qx::trait::is_ptr_base_of<B, D>::removePtr(b, d)) == sizeof(char))) };
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typedef typename std::conditional<qx::trait::is_ptr_base_of<B, D>::value, std::true_type, std::false_type>::type type;
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};
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} // namespace trait
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} // namespace qx
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#endif // _QX_IS_PTR_BASE_OF_H_
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