How do I create a default QTextStream?

[lni]

Hi,

I am creating a function with QTextStream as argument, how do I create a default QTextStream?

I do

void dump( QTextStream& ostr=QTextStream( stdout ) )
{
  ostr << "Test" << endl;
}

void dump( QTextStream& ostr=QTextStream( stdout ) )
{
  ostr << "Test" << endl;
}

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It complains "error: default argument for ‘QTextStream& str’ has type ‘QTextStream’"

I can do so using STL as:

void dump( std::ostream& ostr=std::cout )
{
  ostr << "Test" << std::endl;
}

void dump( std::ostream& ostr=std::cout )
{
  ostr << "Test" << std::endl;
}

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Any trick? Thanks!

[wysota]

You can't assign a temporary object to a non-const reference. The STL example uses an object which is not temporary - if you create the default argument outside the declaration it will work with QTextStream too.

QTextStream qOut(stdout);
//...
void dump(QTextStream &stream = qOut) {
...
}

QTextStream qOut(stdout);
//...
void dump(QTextStream &stream = qOut) {
...
}

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[lni]

You can't assign a temporary object to a non-const reference. The STL example uses an object which is not temporary - if you create the default argument outside the declaration it will work with QTextStream too.

QTextStream qOut(stdout);
//...
void dump(QTextStream &stream = qOut) {
...
}

QTextStream qOut(stdout);
//...
void dump(QTextStream &stream = qOut) {
...
}

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Thanks. It would be nice QTextStream has a default object for that purpose....

[wysota]

Thanks. It would be nice QTextStream has a default object for that purpose....

AFAIR it has. Source code is your friend to find it

[lni]

AFAIR it has. Source code is your friend to find it

Mind to tell where it is? I can't find it...thanks

[wysota]

Mind to tell where it is?

It's probably on your computer if you downloaded Qt yourself. If not, go to the main page of this site and look in the right column of the page or visit qt.nokia.com or qt.gitorious.org