Re: Packing plots into a QLayout

[Hendrik V. <HVe...@gm...>]

Hi Uwe,

thanks for your comments and for correcting my (and I apologize for this) 
somewhat poorly researched statements.

Just one more follow-up question:

> > Moreover, the plot will accept any
> > QWidget as a canvas and does not really use any specific functionality
> > of the canvas.
> 
> Well this is not completely true: methods of a canvas are called at
> several places using QMetaObject::invokeMethod(). Both types of canvases
> offer these methods with the same signature via this API.
> 
> > Have you tried using just a QWidget instead of the
> > QwtPlotCanvas?
> 
> Better don't try !

Agreed, it's silly, but now that you said it, I had to try and it works, in the sense 
that it doesn't crash (thank's to the "// fallback, when canvas has no a replot 
method") but just shows that widget instead of the canvas (and does not plot 
because that's the invokeMethod()'s role).
Actually I was sort of hoping for this to fail at some point but couldn't quite find 
that code (I'm new to QMetaObject).
Hence my question:  Is this really intended to essentially disable type checking?  
I understand that probably the most obvious alternatives lead to some sort of 
"diamond of death" (http://cpptips.com/case_for_mi), but it still leaves an 
uneasy feeling behind...

Best wishes,

Hendrik