Qt initializer

[j4l]

I need one line to initialize a QList

This does not work,

const QList<int> & test(QList<int>() << 7 << 9); //I know, I could simply write const QList<int> test(...); without using & since QList does copy only on write...but....

const QList<int> & test(QList<int>() << 7 << 9); //I know, I could simply write const QList<int> test(...); without using & since QList does copy only on write...but....

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My reference points to an empty QList. Why? I thought it is equivalent to this:

QList tmp;
tmp << 7;
tmp << 9;
const QList<int> & test(tmp); //this *is* ok

QList tmp;
tmp << 7;
tmp << 9;
const QList<int> & test(tmp); //this *is* ok

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And note that assuming there is a function fn somewhere,

int fn(const QList<int> & list) {return list.size();}
 
fn(QList<int>() << 7 << 9); //works!! isn't it the same?

int fn(const QList<int> & list) {return list.size();}

fn(QList<int>() << 7 << 9); //works!! isn't it the same?

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Thanks,
J