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get_base_class.h
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    00001 /****************************************************************************
    00002 **
    00003 ** https://www.qxorm.com/
    00004 ** Copyright (C) 2013 Lionel Marty (contact@qxorm.com)
    00005 **
    00006 ** This file is part of the QxOrm library
    00007 **
    00008 ** This software is provided 'as-is', without any express or implied
    00009 ** warranty. In no event will the authors be held liable for any
    00010 ** damages arising from the use of this software
    00011 **
    00012 ** Commercial Usage
    00013 ** Licensees holding valid commercial QxOrm licenses may use this file in
    00014 ** accordance with the commercial license agreement provided with the
    00015 ** Software or, alternatively, in accordance with the terms contained in
    00016 ** a written agreement between you and Lionel Marty
    00017 **
    00018 ** GNU General Public License Usage
    00019 ** Alternatively, this file may be used under the terms of the GNU
    00020 ** General Public License version 3.0 as published by the Free Software
    00021 ** Foundation and appearing in the file 'license.gpl3.txt' included in the
    00022 ** packaging of this file. Please review the following information to
    00023 ** ensure the GNU General Public License version 3.0 requirements will be
    00024 ** met : http://www.gnu.org/copyleft/gpl.html
    00025 **
    00026 ** If you are unsure which license is appropriate for your use, or
    00027 ** if you have questions regarding the use of this file, please contact :
    00028 ** contact@qxorm.com
    00029 **
    00030 ****************************************************************************/
    00031
    00032 #ifndef _QX_GET_BASE_CLASS_H_
    00033 #define _QX_GET_BASE_CLASS_H_
    00034
    00035 #ifdef _MSC_VER
    00036 #pragma once
    00037 #endif
    00038
    00046 #include <QxTraits/get_class_name.h>
    00047
    00048 namespace qx {
    00049 namespace trait {
    00050
    00051 class no_base_class_defined
    00052 { public: no_base_class_defined() { ; }; virtual ~no_base_class_defined() { ; }; virtual void dummy() = 0; };
    00053
    00058 template <class T>
    00059 class get_base_class
    00060 { public: typedef qx::trait::no_base_class_defined type; };
    00061
    00062 template <class T>
    00063 class is_base_class_defined
    00064 { public: enum { value = (std::is_same<typename qx::trait::get_base_class<T>::type, qx::trait::no_base_class_defined>::value ? 0 : 1) }; };
    00065
    00066 template <class T>
    00067 class get_base_class_2
    00068 {
    00069 private: typedef typename qx::trait::get_base_class<T>::type type_base;
    00070 private: enum { is_base_ok = (std::is_same<type_base, qx::trait::no_base_class_defined>::value ? 0 : 1) };
    00071 public: typedef typename std::conditional<is_base_ok, type_base, T>::type type;
    00072 };
    00073
    00074 } // namespace trait
    00075 } // namespace qx
    00076
    00077 QX_REGISTER_CLASS_NAME(qx::trait::no_base_class_defined)
    00078
    00079 #define QX_REGISTER_BASE_CLASS(derivedClass, baseClass) \
    00080 namespace qx { namespace trait { \
    00081 template <> \
    00082 class get_base_class< derivedClass > \
    00083 { public: typedef baseClass type; }; \
    00084 } } // namespace qx::trait
    00085
    00086 #define QX_GET_BASE_CLASS(T)                       qx::trait::get_base_class< T >::type
    00087 #define QX_GET_BASE_CLASS_WITH_TYPENAME(T)         qx::trait::get_base_class< typename T >::type
    00088 #define QX_IS_BASE_CLASS_DEFINED(T)                qx::trait::is_base_class_defined< T >::value
    00089 #define QX_IS_BASE_CLASS_DEFINED_WITH_TYPENAME(T)  qx::trait::is_base_class_defined< typename T >::value
    00090 #define QX_GET_BASE_CLASS_2(T)                     qx::trait::get_base_class_2< T >::type
    00091 #define QX_GET_BASE_CLASS_2_WITH_TYPENAME(T)       qx::trait::get_base_class_2< typename T >::type
    00092
    00093 #endif // _QX_GET_BASE_CLASS_H_