QxOrm  1.4.5
C++ Object Relational Mapping library
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
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00008 ** This software is provided 'as-is', without any express or implied
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00012 ** Commercial Usage
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00016 ** a written agreement between you and Lionel Marty
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00018 ** GNU General Public License Usage
00019 ** Alternatively, this file may be used under the terms of the GNU
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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_