QString::append() weirdness

[mattc]

Thank you for your efforts Wysota.

It turns out the code does not work "because the standard says so". In other words, while this code is ok:

// bind a temporary *expression* to a const reference
const QString& s = QString("hello");

// bind a temporary *expression* to a const reference
const QString& s = QString("hello");

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this one leaves a dangling reference:

// bind a temporary *object* to a const reference
const QString& s = QString("hello").append("");

// bind a temporary *object* to a const reference
const QString& s = QString("hello").append("");

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I believe that from a purely "technical" point of view there is nothing wrong with the second snippet (a compiler could easily generate working code), but in fact it is not supposed to work.