DataManage/libs/QxOrm/include/QxTraits/get_base_class.h

/****************************************************************************
**
** https://www.qxorm.com/
** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
**
** This file is part of the QxOrm library
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any
** damages arising from the use of this software
**
** Commercial Usage
** Licensees holding valid commercial QxOrm licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Lionel Marty
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file 'license.gpl3.txt' included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met : http://www.gnu.org/copyleft/gpl.html
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** If you are unsure which license is appropriate for your use, or
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****************************************************************************/

#ifndef _QX_GET_BASE_CLASS_H_
#define _QX_GET_BASE_CLASS_H_

#ifdef _MSC_VER
#pragma once
#endif

/*!
 * \file get_base_class.h
 * \author Lionel Marty
 * \ingroup QxTraits
 * \brief qx::trait::get_base_class<T>::type : retrieve base class of type T registered into QxOrm context and return qx::trait::no_base_class_defined if no base class defined
 */

#include <QxTraits/get_class_name.h>

namespace qx {
namespace trait {

class no_base_class_defined
{ public: no_base_class_defined() { ; }; virtual ~no_base_class_defined() { ; }; virtual void dummy() = 0; };

/*!
 * \ingroup QxTraits
 * \brief qx::trait::get_base_class<T>::type : retrieve base class of type T registered into QxOrm context and return qx::trait::no_base_class_defined if no base class defined
 */
template <class T>
class get_base_class
{ public: typedef qx::trait::no_base_class_defined type; };

template <class T>
class is_base_class_defined
{ public: enum { value = (std::is_same<typename qx::trait::get_base_class<T>::type, qx::trait::no_base_class_defined>::value ? 0 : 1) }; };

template <class T>
class get_base_class_2
{
private: typedef typename qx::trait::get_base_class<T>::type type_base;
private: enum { is_base_ok = (std::is_same<type_base, qx::trait::no_base_class_defined>::value ? 0 : 1) };
public: typedef typename std::conditional<is_base_ok, type_base, T>::type type;
};

} // namespace trait
} // namespace qx

QX_REGISTER_CLASS_NAME(qx::trait::no_base_class_defined)

#define QX_REGISTER_BASE_CLASS(derivedClass, baseClass) \
namespace qx { namespace trait { \
template <> \
class get_base_class< derivedClass > \
{ public: typedef baseClass type; }; \
} } // namespace qx::trait

#define QX_GET_BASE_CLASS(T)                       qx::trait::get_base_class< T >::type
#define QX_GET_BASE_CLASS_WITH_TYPENAME(T)         qx::trait::get_base_class< typename T >::type
#define QX_IS_BASE_CLASS_DEFINED(T)                qx::trait::is_base_class_defined< T >::value
#define QX_IS_BASE_CLASS_DEFINED_WITH_TYPENAME(T)  qx::trait::is_base_class_defined< typename T >::value
#define QX_GET_BASE_CLASS_2(T)                     qx::trait::get_base_class_2< T >::type
#define QX_GET_BASE_CLASS_2_WITH_TYPENAME(T)       qx::trait::get_base_class_2< typename T >::type

#endif // _QX_GET_BASE_CLASS_H_