QxOrm 1.1.8
C++ Object Relational Mapping library
is_valid_primary_key.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
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00025 
00026 #ifndef _QX_IS_VALID_PRIMARY_KEY_H_
00027 #define _QX_IS_VALID_PRIMARY_KEY_H_
00028 
00029 #ifdef _MSC_VER
00030 #pragma once
00031 #endif
00032 
00040 namespace qx {
00041 namespace trait {
00042 namespace detail {
00043 
00048 template <typename T>
00049 struct is_valid_primary_key
00050 { static inline bool get(const T & t) { Q_UNUSED(t); qAssert(false); return false; } };
00051 
00052 template <>
00053 struct is_valid_primary_key<short>
00054 { static inline bool get(const short & t) { return (t != 0); } };
00055 
00056 template <>
00057 struct is_valid_primary_key<int>
00058 { static inline bool get(const int & t) { return (t != 0); } };
00059 
00060 template <>
00061 struct is_valid_primary_key<long>
00062 { static inline bool get(const long & t) { return (t != 0); } };
00063 
00064 template <>
00065 struct is_valid_primary_key<long long>
00066 { static inline bool get(const long long & t) { return (t != 0); } };
00067 
00068 template <>
00069 struct is_valid_primary_key<QString>
00070 { static inline bool get(const QString & t) { return (! t.isEmpty()); } };
00071 
00072 template <>
00073 struct is_valid_primary_key<std::string>
00074 { static inline bool get(const std::string & t) { return (! t.empty()); } };
00075 
00076 template <>
00077 struct is_valid_primary_key<std::wstring>
00078 { static inline bool get(const std::wstring & t) { return (! t.empty()); } };
00079 
00080 template <>
00081 struct is_valid_primary_key<QVariant>
00082 { static inline bool get(const QVariant & t) { return ((t.type() == QVariant::String) ? qx::trait::detail::is_valid_primary_key<QString>::get(t.toString()) : (! t.isNull() && (t.toLongLong() != 0))); } };
00083 
00084 } // namespace detail
00085 
00086 template <typename T>
00087 inline bool is_valid_primary_key(const T & t)
00088 { return qx::trait::detail::is_valid_primary_key<T>::get(t); }
00089 
00090 } // namespace trait
00091 } // namespace qx
00092 
00093 #endif // _QX_IS_VALID_PRIMARY_KEY_H_
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