On 11 nov. 2013, at 13:50, Giuseppe D'Angelo <giuseppe.dang...@kdab.com> wrote:
> 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.
>
Ok, with that and the explanation of Thiago, it's crystal clear. Thanks !
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