QxOrm  1.2.3
C++ Object Relational Mapping library
construct_ptr.h
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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_CONSTRUCT_PTR_H_
00027 #define _QX_CONSTRUCT_PTR_H_
00028 
00029 #ifdef _MSC_VER
00030 #pragma once
00031 #endif
00032 
00040 #include <boost/scoped_ptr.hpp>
00041 #include <boost/shared_ptr.hpp>
00042 #include <boost/intrusive_ptr.hpp>
00043 #include <boost/type_traits/is_abstract.hpp>
00044 #include <boost/type_traits/remove_pointer.hpp>
00045 
00046 #include <QtCore/qsharedpointer.h>
00047 
00048 #if (QT_VERSION >= 0x040600)
00049 #include <QtCore/qscopedpointer.h>
00050 #endif // (QT_VERSION >= 0x040600)
00051 
00052 #include <QxDao/QxDaoPointer.h>
00053 
00054 namespace qx {
00055 namespace trait {
00056 
00061 template <typename T>
00062 struct construct_ptr
00063 {
00064 
00065 private:
00066 
00067    typedef typename boost::remove_pointer<T>::type type_ptr;
00068 
00069 public:
00070 
00071    static inline void get(T & t)
00072    { new_ptr<boost::is_abstract<type_ptr>::value, 0>::get(t); }
00073 
00074 private:
00075 
00076    template <bool isAbstract /* = false */, int dummy>
00077    struct new_ptr
00078    { static inline void get(T & t) { t = new type_ptr(); } };
00079 
00080    template <int dummy>
00081    struct new_ptr<true, dummy>
00082    { static inline void get(T & t) { Q_UNUSED(t); qDebug("[QxOrm] qx::trait::construct_ptr<T> : %s", "cannot instantiate abstract class"); } };
00083 
00084 };
00085 
00086 template <typename T>
00087 struct construct_ptr< boost::scoped_ptr<T> >
00088 { static inline void get(boost::scoped_ptr<T> & t) { t.reset(new T()); } };
00089 
00090 template <typename T>
00091 struct construct_ptr< boost::shared_ptr<T> >
00092 { static inline void get(boost::shared_ptr<T> & t) { t.reset(new T()); } };
00093 
00094 template <typename T>
00095 struct construct_ptr< boost::intrusive_ptr<T> >
00096 { static inline void get(boost::intrusive_ptr<T> & t) { t.reset(new T()); } };
00097 
00098 template <typename T>
00099 struct construct_ptr< QSharedPointer<T> >
00100 { static inline void get(QSharedPointer<T> & t) { t = QSharedPointer<T>(new T()); } };
00101 
00102 #if (QT_VERSION >= 0x040600)
00103 template <typename T>
00104 struct construct_ptr< QScopedPointer<T> >
00105 { static inline void get(QScopedPointer<T> & t) { t = QScopedPointer<T>(new T()); } };
00106 #endif // (QT_VERSION >= 0x040600)
00107 
00108 template <typename T>
00109 struct construct_ptr< qx::dao::ptr<T> >
00110 { static inline void get(qx::dao::ptr<T> & t) { t = qx::dao::ptr<T>(new T()); } };
00111 
00112 } // namespace trait
00113 } // namespace qx
00114 
00115 #endif // _QX_CONSTRUCT_PTR_H_