/Poi/Qt/AndroidChargeProject/MasterWeb/UserVerifyWidget.cpp:30: 错误:undefined reference to `void Wt::Dbo::Session::mapClass<ManagedUser>(char const*)'

在使用Wt::Dbo库时，如果妳忘记包含 <Wt/Dbo/Dbo>这个头文件，那么就会遇到以下的编译错误：

UserVerifyWidget.o: In function `UserVerifyWidget::ListUsersAwaitingVerify()':

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:30: undefined reference to `void Wt::Dbo::Session::mapClass<ManagedUser>(char const*)'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:36: undefined reference to `Wt::Dbo::Query<Wt::Dbo::ptr<ManagedUser>, Wt::Dbo::DynamicBinding>::where(std::string const&)'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:36: undefined reference to `Wt::Dbo::Query<Wt::Dbo::ptr<ManagedUser>, Wt::Dbo::DynamicBinding>::~Query()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:38: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::size() const'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:41: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::begin()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:41: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::const_iterator::const_iterator(Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::iterator const&)'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:41: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::iterator::~iterator()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:43: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::const_iterator::operator*()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:43: undefined reference to `Wt::Dbo::ptr<ManagedUser>::operator->() const'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:43: undefined reference to `Wt::Dbo::ptr<ManagedUser>::~ptr()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:44: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::const_iterator::operator*()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:44: undefined reference to `Wt::Dbo::ptr<ManagedUser>::operator->() const'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:44: undefined reference to `Wt::Dbo::ptr<ManagedUser>::~ptr()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:41: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::const_iterator::operator++()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:41: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::end()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:41: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::const_iterator::operator!=(Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::const_iterator const&) const'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:41: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::iterator::~iterator()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:50: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::~collection()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:36: undefined reference to `Wt::Dbo::Query<Wt::Dbo::ptr<ManagedUser>, Wt::Dbo::DynamicBinding>::~Query()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:36: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::~collection()'

make: Leaving directory `/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:41: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::iterator::~iterator()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:43: undefined reference to `Wt::Dbo::ptr<ManagedUser>::~ptr()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:44: undefined reference to `Wt::Dbo::ptr<ManagedUser>::~ptr()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:41: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::iterator::~iterator()'

/Poi/Qt/AndroidChargeProject/MasterWeb-build-Desktop-Debug/../MasterWeb/UserVerifyWidget.cpp:50: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::~collection()'

UserVerifyWidget.o: In function `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::const_iterator::~const_iterator()':

/usr/include/Wt/Dbo/collection:186: undefined reference to `Wt::Dbo::collection<Wt::Dbo::ptr<ManagedUser> >::iterator::~iterator()'

UserVerifyWidget.o: In function `Wt::Dbo::Query<Wt::Dbo::ptr<ManagedUser>, Wt::Dbo::DynamicBinding> Wt::Dbo::Session::find<ManagedUser>(std::string const&)':

/usr/include/Wt/Dbo/Session:159: undefined reference to `Wt::Dbo::Query<Wt::Dbo::ptr<ManagedUser>, Wt::Dbo::DynamicBinding> Wt::Dbo::Session::find<ManagedUser, Wt::Dbo::DynamicBinding>(std::string const&)'

collect2: error: ld returned 1 exit status

make: *** [MasterWeb] Error 1

可能跟<Wt/Dbo/Dbo>里定义的某些模板有关，具体的原因要研究一下这个头文件才知道。

模板真是晦涩难懂啊。

解决办法就是包含<Wt/Dbo/Dbo> 。

如果妳要用Wt::Dbo库，就别忘记包含<Wt/Dbo/Dbo>。

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