QxOrm  1.2.9
C++ Object Relational Mapping library
construct_ptr.h
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00001 /****************************************************************************
00002 **
00003 ** http://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 :
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00031 
00032 #ifndef _QX_CONSTRUCT_PTR_H_
00033 #define _QX_CONSTRUCT_PTR_H_
00034 
00035 #ifdef _MSC_VER
00036 #pragma once
00037 #endif
00038 
00046 #include <boost/scoped_ptr.hpp>
00047 #include <boost/shared_ptr.hpp>
00048 #include <boost/intrusive_ptr.hpp>
00049 #include <boost/type_traits/is_abstract.hpp>
00050 #include <boost/type_traits/remove_pointer.hpp>
00051 
00052 #include <QtCore/qsharedpointer.h>
00053 
00054 #if (QT_VERSION >= 0x040600)
00055 #include <QtCore/qscopedpointer.h>
00056 #endif // (QT_VERSION >= 0x040600)
00057 
00058 #include <QxDao/QxDaoPointer.h>
00059 
00060 namespace qx {
00061 namespace trait {
00062 
00067 template <typename T>
00068 struct construct_ptr
00069 {
00070 
00071 private:
00072 
00073    typedef typename boost::remove_pointer<T>::type type_ptr;
00074 
00075 public:
00076 
00077    static inline void get(T & t)
00078    { new_ptr<boost::is_abstract<type_ptr>::value, 0>::get(t); }
00079 
00080 private:
00081 
00082    template <bool isAbstract /* = false */, int dummy>
00083    struct new_ptr
00084    { static inline void get(T & t) { t = new type_ptr(); } };
00085 
00086    template <int dummy>
00087    struct new_ptr<true, dummy>
00088    { static inline void get(T & t) { Q_UNUSED(t); qDebug("[QxOrm] qx::trait::construct_ptr<T> : %s", "cannot instantiate abstract class"); } };
00089 
00090 };
00091 
00092 template <typename T>
00093 struct construct_ptr< boost::scoped_ptr<T> >
00094 { static inline void get(boost::scoped_ptr<T> & t) { t.reset(new T()); } };
00095 
00096 template <typename T>
00097 struct construct_ptr< boost::shared_ptr<T> >
00098 { static inline void get(boost::shared_ptr<T> & t) { t.reset(new T()); } };
00099 
00100 template <typename T>
00101 struct construct_ptr< boost::intrusive_ptr<T> >
00102 { static inline void get(boost::intrusive_ptr<T> & t) { t.reset(new T()); } };
00103 
00104 template <typename T>
00105 struct construct_ptr< QSharedPointer<T> >
00106 { static inline void get(QSharedPointer<T> & t) { t = QSharedPointer<T>(new T()); } };
00107 
00108 #if (QT_VERSION >= 0x040600)
00109 template <typename T>
00110 struct construct_ptr< QScopedPointer<T> >
00111 { static inline void get(QScopedPointer<T> & t) { t = QScopedPointer<T>(new T()); } };
00112 #endif // (QT_VERSION >= 0x040600)
00113 
00114 template <typename T>
00115 struct construct_ptr< qx::dao::ptr<T> >
00116 { static inline void get(qx::dao::ptr<T> & t) { t = qx::dao::ptr<T>(new T()); } };
00117 
00118 } // namespace trait
00119 } // namespace qx
00120 
00121 #endif // _QX_CONSTRUCT_PTR_H_