[Qt-interest] Strange compilation error

[Ian Thomson]

Hi,

You can connect a SIGNAL to a SIGNAL if you want.

It seems like he has not included the header for QAbstractItemModel and 
only forward declared it, so the compiler can't tell that it is a QObject.

Cheers,
Ian.

Witteveen, Arnt wrote:
> You need to connect a SIGNAL to a SLOT, not to another SIGNAL.
> Arnt
> 
>     ------------------------------------------------------------------------
>     *From:* qt-interest-bounces at trolltech.com
>     [mailto:qt-interest-bounces at trolltech.com] *On Behalf Of *Etienne
>     Sandré-Chardonnal
>     *Sent:* donderdag 15 januari 2009 15:16
>     *To:* qt-interest at trolltech.com
>     *Subject:* [Qt-interest] Strange compilation error
> 
>     Dear all,
> 
>     I am using this line of code in a QObject subclass:
>     connect(getVariablesModel(), SIGNAL(dataChanged()), this,
>     SIGNAL(functionChanged()));
> 
>     I get this error:
>     no matching function for call to
>     `Material::connect(QAbstractItemModel*, const char[15], Material*
>     const, const char[29])'
> 
>     This is rather strange, as everything seems fine :
>      - QAbstractItemModel is a Qt subclass of QObject
>      - The Material class derives from QObject, and I did not forgot the
>     Q_OBJECT macro. Moreover, I use other connects with Material*
>     pointers without error.
> 
>     More and more strange, if I replace the line by:
>     connect((QObject*)getVariablesModel(), SIGNAL(dataChanged()), this,
>     SIGNAL(functionChanged()));
>     Everything works fine! That means the compiler does not convert
>     QAbstractItemModel* into QObject*
> 
>     I am using MinGW gcc 3.4.2 shipped with Qt
> 
>     If someone could help me to understand this...
> 
>     Thanks!
> 
>     Etienne
> 
> 
> 
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