D15791: Get rid of adding 'char' to a string pointer

[Rolf Eike Beer]

>   Better to use new Folder(QString(name + '/').toUtf8().conData()
>   Regards

Sadly I can't get phabricator to show me the original diff, but my initial 
thought would be something like this should be more efficient:

  (name.toUtf8() + '/').constData()

The other (entirely unrelated) question that came up when looking into the 
code is: why do the File and Folder classes use char* at all? I mean, if it 
must not be a QString for whatever reason (which one?), then use QByteArray, 
which is implicit shared, does not need manual handling in the destructor, 
does not need the extra .constData() here and so on.

Oh, and the "// undefined" comments in the header should be written as "= 
delete", then the compiler would understand them. Or should have been written 
as Q_DISABLE_COPY for ages.

Eike
-- 
Rolf Eike Beer, emlix GmbH, http://www.emlix.com
Fon +49 551 30664-0, Fax +49 551 30664-11
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