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

[Thiago Macieira]

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);

-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
      PGP/GPG: 0x6EF45358; fingerprint:
      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
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