[Qt-interest] Memory leak converting QScriptValue to QVariant

[Alberto Scarpa]

Hi Thiago,
I know metatype ID of -1 is not a valid metatype ID for QVariant. Maybe i misunderstand the backtrace, but i have a leak 
running the test program i attached. The test runs a QScriptEngine and never creates explicitly a QVariant. Did you 
test my application? Can you tell me if it is a Qt bug or an incorrect behavior of my app.

Thanks

Alberto Scarpa
--------
Senior Software Engineer
M31 SpA
www.m31.com

On Wednesday 19 August 2009 18:17:17 Thiago Macieira wrote:
> Em Quarta-feira 19 Agosto 2009, às 11:34:23, Alberto Scarpa escreveu:
> > The leak rises converting the QScriptValue to QVariant inseide the
> > variantF romValue function.
> >  A QVariant with type -1 is created and in its destructor
> > hadle->clear(&d); is not called (see the following backtrace).
> >
> > You have the leak with this simple program too:
> >
> > #include <QVariant>
> > int main(int argc, char *argv[])
> > {
> >     while(1)
> >         QVariant v1( -1, (void*)0 );
> > }
>
> A meta type ID of -1 should never be used. That's undefined behaviour, so a
> leak can be expected.
>
> The bug is actually in the code that is getting the metatype ID and not
> checking for -1.
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