[Qt-interest] Weird compiler error with QString(QChar(value))

[Stephen Chu]

In article <201005052127.23761.thiago at kde.org>,
 Thiago Macieira <thiago at kde.org> wrote:

> Em Quarta-feira 5. Maio 2010, às 20.51.00, Nikos Chantziaras escreveu:
> > Not sure I understand why this won't compile:
> > 
> >    int unicodeValue = func_that_returns_a_unicode_value();
> >    QString s(QChar(unicodeValue));
> >    const QByteArray& utf8 = s.toUtf8();  // <-- error happens here
> > 
> > I get:
> > 
> > error: request for member 'toUtf8' in 's', which is of non-class type
> > 'QString(QChar)'
> > 
> > I'm confused as hell :P
> 
> This is one of the things you just have to learn. This line:
> 
>    QString s(QChar(unicodeValue));
> 
> is not what you think.
> 
> You thought you were declaring an object of class QString and calling one of 
> its constructors with a QChar (which in turn was initialised with an int).
> 
> The compiler understood that you were declaring a pointer to a function that 
> returns QString and takes a QChar as a parameter.
> 
> Solution:
> 
>    QString s = QChar(unicodeValue);

Thanks for the explanation. I ran into the same problem just last night. 
Pulling my hairs out on this one.

One question though. If that line of code actually declares a function, 
what does 'unicodeValue' in the declaration do? I thought a function 
declaration is something like:

    QString s(QChar unicodeValue);

-- 
Stephen Chu