[Solved] undefined reference to static QString

? Offline

@
...//heather
QString getNewBigliettoToBeWritten();
void setNewBigliettoToBeWritten(const QString &value);

private:
static QString currentSezione, newBigliettoToBeWritten;
@

@
//.cpp file
ProgramSettings::ProgramSettings(QObject *parent) :
QObject(parent)
{
//vedi metodi in heather
newBigliettoToBeWritten = QString("");
currentSezione = QString("");
}

QString ProgramSettings::getNewBigliettoToBeWritten()
{
return ProgramSettings::newBigliettoToBeWritten;
}

void ProgramSettings::setNewBigliettoToBeWritten(const QString &value)
{
if(value != newBigliettoToBeWritten && value != QString("") && !value.isNull())
newBigliettoToBeWritten = value;
}
@

errors:
@
./debug\widget1.o:widget1.cpp:(.text$_ZN15ProgramSettings17setCurrentSezioneE7QString[ProgramSettings::setCurrentSezione(QString)]+0x10): undefined reference to ProgramSettings::currentSezione' ./debug\widget1.o:widget1.cpp:(.text$_ZN15ProgramSettings17setCurrentSezioneE7QString[ProgramSettings::setCurrentSezione(QString)]+0x20): undefined reference to ProgramSettings::currentSezione'
./debug\widget1.o:widget1.cpp:(.text$_ZN15ProgramSettings17setCurrentSezioneE7QString[ProgramSettings::setCurrentSezione(QString)]+0x30): undefined reference to ProgramSettings::currentSezione' ./debug\programsettings.o: In function ProgramSettings':
C:\Users\7-Spode\Documents\Qt-project\Wortfluss-build-simulator-Simulator_Qt_for_MinGW_4_4__Qt_SDK__Debug/../Wortfluss/Utility/programsettings.cpp:11: undefined reference to ProgramSettings::newBigliettoToBeWritten' C:\Users\7-Spode\Documents\Qt-project\Wortfluss-build-simulator-Simulator_Qt_for_MinGW_4_4__Qt_SDK__Debug/../Wortfluss/Utility/programsettings.cpp:12: undefined reference to ProgramSettings::currentSezione'
C:\Users\7-Spode\Documents\Qt-project\Wortfluss-build-simulator-Simulator_Qt_for_MinGW_4_4__Qt_SDK__Debug/../Wortfluss/Utility/programsettings.cpp:11: undefined reference to ProgramSettings::newBigliettoToBeWritten' C:\Users\7-Spode\Documents\Qt-project\Wortfluss-build-simulator-Simulator_Qt_for_MinGW_4_4__Qt_SDK__Debug/../Wortfluss/Utility/programsettings.cpp:12: undefined reference to ProgramSettings::currentSezione'
./debug\programsettings.o:C:\Users\7-Spode\Documents\Qt-project\Wortfluss-build-simulator-Simulator_Qt_for_MinGW_4_4__Qt_SDK__Debug/../Wortfluss/Utility/programsettings.cpp:40: undefined reference to ProgramSettings::newBigliettoToBeWritten' ./debug\programsettings.o:C:\Users\7-Spode\Documents\Qt-project\Wortfluss-build-simulator-Simulator_Qt_for_MinGW_4_4__Qt_SDK__Debug/../Wortfluss/Utility/programsettings.cpp:45: undefined reference to ProgramSettings::newBigliettoToBeWritten'
./debug\programsettings.o:C:\Users\7-Spode\Documents\Qt-project\Wortfluss-build-simulator-Simulator_Qt_for_MinGW_4_4__Qt_SDK__Debug/../Wortfluss/Utility/programsettings.cpp:46: undefined reference to ProgramSettings::newBigliettoToBeWritten' ./debug\widgetbiglietti.o:widgetbiglietti.cpp:(.text$_ZN15ProgramSettings17getCurrentSezioneEv[ProgramSettings::getCurrentSezione()]+0x10): undefined reference to ProgramSettings::currentSezione'
@

? Offline

Static members should be defined outside constructor, because the are not connected with any instance of class. For instance you have "here":http://stackoverflow.com/questions/3531060/how-to-initialize-a-static-member-in-c information how to initialize such variable.

? Offline

Just move the static member initialization outside of the class, somewhere in the cpp.

@QString ProgramSettings::currentSezione = "bla bla";@

? Offline

nothing:

@
ProgramSettings::ProgramSettings(QObject *parent) :
QObject(parent)
{
//vedi metodi in heather
QString ProgramSettings::currentSezione = "";
QString ProgramSettings::newBigliettoToBeWritten = "";
}
@

errors:
@
..\Wortfluss\Utility\programsettings.cpp: In constructor 'ProgramSettings::ProgramSettings(QObject*)':
..\Wortfluss\Utility\programsettings.cpp:11: error: invalid use of qualified-name 'ProgramSettings::currentSezione'
..\Wortfluss\Utility\programsettings.cpp:12: error: invalid use of qualified-name 'ProgramSettings::newBigliettoToBeWritten'
@

napajejenunedk0

Static class variables should be initialized outside all methods:

@
//vedi metodi in heather
QString ProgramSettings::currentSezione = "";
QString ProgramSettings::newBigliettoToBeWritten = "";

ProgramSettings::ProgramSettings(QObject *parent) :
QObject(parent)
{
}@

or

@
//vedi metodi in heather
QString ProgramSettings::currentSezione;
QString ProgramSettings::newBigliettoToBeWritten;

ProgramSettings::ProgramSettings(QObject *parent) :
QObject(parent)
{
}@

? Offline

[quote author="spode" date="1348582503"]nothing:
[/quote]

Well, you are still initializing the strings in the constructor, I said outside of the class in the cpp. You only changed the assignment parameter from a QString to a string literal (const char*). You cannot use static members if they are not defined, you try to define them in the constructor, which counts for usage, which is not possible if they are not defined.

? Offline

solved. thank you so much! =)