Il 11/11/2013 13:37, Samuel Gaist ha scritto:
Hi,I have been experiencing a strange behavior with QStringList and the order of execution of takeFirst. The following code: QString line = file.readLine(); // line contains "46 71\n" QStringList lineData = line.split(); // lineData contains ("46", "71\n") qDebug() << lineData.takeFirst() << lineData.takeFirst();
I've already explained this in the past but I can't find the relevant email. This last line is parsed as
operator<<( operator<<( qDebug(), lineData.takeFirst() ) , lineData.takeFirst() )
(operator<< is left associative).Take the outer operator<<. C++ does not define the order of evaluating its parameters. That means that either lineData.takeFirst() can be called before evaluating the inner operator<<, or vice-versa. Depending on what the compiler chooses to do, you'll have a different result.
HTH, -- Giuseppe D'Angelo | giuseppe.dang...@kdab.com | Software Engineer KDAB (UK) Ltd., a KDAB Group company Tel. UK +44-1738-450410, Sweden (HQ) +46-563-540090 KDAB - Qt Experts - Platform-independent software solutions
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