QxOrm  1.2.6
C++ Object Relational Mapping library
is_valid_primary_key.h
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00002 **
00003 ** http://www.qxorm.com/
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00005 **
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00031 
00032 #ifndef _QX_IS_VALID_PRIMARY_KEY_H_
00033 #define _QX_IS_VALID_PRIMARY_KEY_H_
00034 
00035 #ifdef _MSC_VER
00036 #pragma once
00037 #endif
00038 
00046 namespace qx {
00047 namespace trait {
00048 namespace detail {
00049 
00054 template <typename T>
00055 struct is_valid_primary_key
00056 { static inline bool get(const T & t) { Q_UNUSED(t); qAssert(false); return false; } };
00057 
00058 template <>
00059 struct is_valid_primary_key<short>
00060 { static inline bool get(const short & t) { return (t != 0); } };
00061 
00062 template <>
00063 struct is_valid_primary_key<int>
00064 { static inline bool get(const int & t) { return (t != 0); } };
00065 
00066 template <>
00067 struct is_valid_primary_key<long>
00068 { static inline bool get(const long & t) { return (t != 0); } };
00069 
00070 template <>
00071 struct is_valid_primary_key<long long>
00072 { static inline bool get(const long long & t) { return (t != 0); } };
00073 
00074 template <>
00075 struct is_valid_primary_key<QString>
00076 { static inline bool get(const QString & t) { return (! t.isEmpty()); } };
00077 
00078 template <>
00079 struct is_valid_primary_key<std::string>
00080 { static inline bool get(const std::string & t) { return (! t.empty()); } };
00081 
00082 template <>
00083 struct is_valid_primary_key<std::wstring>
00084 { static inline bool get(const std::wstring & t) { return (! t.empty()); } };
00085 
00086 template <>
00087 struct is_valid_primary_key<QVariant>
00088 { 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))); } };
00089 
00090 } // namespace detail
00091 
00092 template <typename T>
00093 inline bool is_valid_primary_key(const T & t)
00094 { return qx::trait::detail::is_valid_primary_key<T>::get(t); }
00095 
00096 } // namespace trait
00097 } // namespace qx
00098 
00099 #endif // _QX_IS_VALID_PRIMARY_KEY_H_