QxOrm  1.4.4
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 <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 std::remove_pointer<T>::type type_ptr;
00068 
00069 public:
00070 
00071    static inline void get(T & t)
00072    { new_ptr<std::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 #ifdef _QX_ENABLE_BOOST
00087 
00088 template <typename T>
00089 struct construct_ptr< boost::scoped_ptr<T> >
00090 { static inline void get(boost::scoped_ptr<T> & t) { t.reset(new T()); } };
00091 
00092 template <typename T>
00093 struct construct_ptr< boost::shared_ptr<T> >
00094 { static inline void get(boost::shared_ptr<T> & t) { t.reset(new T()); } };
00095 
00096 template <typename T>
00097 struct construct_ptr< boost::intrusive_ptr<T> >
00098 { static inline void get(boost::intrusive_ptr<T> & t) { t.reset(new T()); } };
00099 
00100 #endif // _QX_ENABLE_BOOST
00101 
00102 template <typename T>
00103 struct construct_ptr< QSharedPointer<T> >
00104 { static inline void get(QSharedPointer<T> & t) { t = QSharedPointer<T>(new T()); } };
00105 
00106 #if (QT_VERSION >= 0x040600)
00107 template <typename T>
00108 struct construct_ptr< QScopedPointer<T> >
00109 { static inline void get(QScopedPointer<T> & t) { t = QScopedPointer<T>(new T()); } };
00110 #endif // (QT_VERSION >= 0x040600)
00111 
00112 template <typename T>
00113 struct construct_ptr< qx::dao::ptr<T> >
00114 { static inline void get(qx::dao::ptr<T> & t) { t = qx::dao::ptr<T>(new T()); } };
00115 
00116 template <typename T>
00117 struct construct_ptr< std::unique_ptr<T> >
00118 { static inline void get(std::unique_ptr<T> & t) { t.reset(new T()); } };
00119 
00120 template <typename T>
00121 struct construct_ptr< std::shared_ptr<T> >
00122 { static inline void get(std::shared_ptr<T> & t) { t.reset(new T()); } };
00123 
00124 } // namespace trait
00125 } // namespace qx
00126 
00127 #endif // _QX_CONSTRUCT_PTR_H_