QxOrm 1.1.9
C++ Object Relational Mapping library
get_base_class.h
Go to the documentation of this file.
00001 /****************************************************************************
00002 **
00003 ** http://www.qxorm.com/
00004 ** http://sourceforge.net/projects/qxorm/
00005 ** Original file by Lionel Marty
00006 **
00007 ** This file is part of the QxOrm library
00008 **
00009 ** This software is provided 'as-is', without any express or implied
00010 ** warranty. In no event will the authors be held liable for any
00011 ** damages arising from the use of this software.
00012 **
00013 ** GNU Lesser General Public License Usage
00014 ** This file must be used under the terms of the GNU Lesser
00015 ** General Public License version 2.1 as published by the Free Software
00016 ** Foundation and appearing in the file 'license.lgpl.txt' included in the
00017 ** packaging of this file.  Please review the following information to
00018 ** ensure the GNU Lesser General Public License version 2.1 requirements
00019 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
00020 **
00021 ** If you have questions regarding the use of this file, please contact :
00022 ** contact@qxorm.com
00023 **
00024 ****************************************************************************/
00025 
00026 #ifndef _QX_GET_BASE_CLASS_H_
00027 #define _QX_GET_BASE_CLASS_H_
00028 
00029 #ifdef _MSC_VER
00030 #pragma once
00031 #endif
00032 
00040 #include <boost/mpl/if.hpp>
00041 #include <boost/mpl/logical.hpp>
00042 #include <boost/type_traits/is_same.hpp>
00043 
00044 #include <QxTraits/get_class_name.h>
00045 
00046 namespace qx {
00047 namespace trait {
00048 
00049 class no_base_class_defined
00050 { no_base_class_defined() { ; }; virtual ~no_base_class_defined() { ; }; virtual void dummy() = 0; };
00051 
00056 template <class T>
00057 class get_base_class
00058 { public: typedef qx::trait::no_base_class_defined type; };
00059 
00060 template <class T>
00061 class is_base_class_defined
00062 { public: enum { value = (boost::is_same<typename qx::trait::get_base_class<T>::type, qx::trait::no_base_class_defined>::value ? 0 : 1) }; };
00063 
00064 template <class T>
00065 class get_base_class_2
00066 {
00067 private: typedef typename qx::trait::get_base_class<T>::type type_base;
00068 private: enum { is_base_ok = (boost::is_same<type_base, qx::trait::no_base_class_defined>::value ? 0 : 1) };
00069 public: typedef typename boost::mpl::if_c<is_base_ok, type_base, T>::type type;
00070 };
00071 
00072 } // namespace trait
00073 } // namespace qx
00074 
00075 QX_REGISTER_CLASS_NAME(qx::trait::no_base_class_defined)
00076 
00077 #define QX_REGISTER_BASE_CLASS(derivedClass, baseClass) \
00078 namespace qx { namespace trait { \
00079 template <> \
00080 class get_base_class< derivedClass > \
00081 { public: typedef baseClass type; }; \
00082 } } // namespace qx::trait
00083 
00084 #define QX_GET_BASE_CLASS(T)                       qx::trait::get_base_class< T >::type
00085 #define QX_GET_BASE_CLASS_WITH_TYPENAME(T)         qx::trait::get_base_class< typename T >::type
00086 #define QX_IS_BASE_CLASS_DEFINED(T)                qx::trait::is_base_class_defined< T >::value
00087 #define QX_IS_BASE_CLASS_DEFINED_WITH_TYPENAME(T)  qx::trait::is_base_class_defined< typename T >::value
00088 #define QX_GET_BASE_CLASS_2(T)                     qx::trait::get_base_class_2< T >::type
00089 #define QX_GET_BASE_CLASS_2_WITH_TYPENAME(T)       qx::trait::get_base_class_2< typename T >::type
00090 
00091 #endif // _QX_GET_BASE_CLASS_H_
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Defines