> In your case, if you use ptr or template for aliasing instead of let/var you
> will not ...
Yes, but I can not see how this really helps.
gintro attemps to provide a simple gtk api similar to maybe Python or Ruby, so
the user will be able to just allocate a surface and a cairo context, and then
do the painting. (Buffered painting on custom surface in this case, plain
painting in the draw callback is already working fine.) This is
proc paint(this: PDA) =
this.surf = this.darea.window.createSimilarSurface(Content.color,
this.darea.allocatedWidth, this.darea.allocatedHeight)
let cr = newContext(this.surf)
cr.lineTo(myX, myY)
Run
And my suggestions in my initial post works both fine...
Setting impl to nil in the macro generated code avoids a cairo_destroy() for
sure. And the trick "type ContextXX = object of Context; var cr: ContextXX"
avoids the =destroy call too, but I am not sure if Araq may change that later.
I had the feeling that lent or sink annotations for local variables may also
make a difference, but I may not really understand them, have not yet seen a
working example code.
