invalid use of incomplete type ‘struct QPair<QString, QDate>’

[TheQuest]

I'm trying to learn how to program in C++ with Qt4.5. I am sure I am missing something but I cannot understand the following compiler message:

birthday.cpp: In member function ‘bool Birthday::append(const QString&, const QDate&)’:
birthday.cpp:22: error: invalid use of incomplete type ‘struct QPair<QString, QDate>’

The incriminated code is just this

bool Birthday::append( const QString& name, const QDate& date )
{
...
QPair<const QString&, const QDate&> data = qMakePair( name, date );
...
}

Thanks in advance to everyone who will reply.

fabio

[codebehind]

the document said
that you have to use append.
in your case:

QPair<const QString&, const QDate&> data;
data.append(qMakePair( name, date ));

QPair<const QString&, const QDate&> data;
data.append(qMakePair( name, date ));

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[codebehind]

sorry i forgot something:

QList<QPair<const QString&, const QDate&> > data;
data.append(qMakePair( name, date ));

QList<QPair<const QString&, const QDate&> > data;
data.append(qMakePair( name, date ));

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[TheQuest]

sorry i forgot something:

QList<QPair<const QString&, const QDate&> > data;
data.append(qMakePair( name, date ));

QList<QPair<const QString&, const QDate&> > data;
data.append(qMakePair( name, date ));

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How is what you wrote related to my code? Where have you seen a QList to append any QPair to?

Please, stick to my code and to the related compiler error.

[codebehind]

sorry! i just copied the example....

well, i tried the next code and it works:

void append( const QString& name, const QDate& date )
{
   QPair<QString,QDate> data = qMakePair( name, date );
}

void append( const QString& name, const QDate& date )
{
   QPair<QString,QDate> data = qMakePair( name, date );
}

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or

void append( const QString& name, const QDate& date )
{
   QPair<QString,QDate> data( name, date );
}

void append( const QString& name, const QDate& date )
{
   QPair<QString,QDate> data( name, date );
}

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