Finally a managed to do it with the following:
aPnt1 = newHandle( cast[ptr Geom_Point](aPnt2.get) )
Run
where:
* `aPnt2.get`: `get` is wrapped from the library I am working on. It gives
you the pointer from the given handle. So its type is: `ptr
Geom_CartesianPoint`.
* `cast[ptr Geom_Point](aPnt2.get) `: then I get the conversion from `ptr
Geom_CartesianPoint` to `ptr Geom_Point`.
* `newHandle( ... )`: this creates new handles. It can do it from a pointer
as it is being done in this case.
The downcasting can be done in a similar way.
So the following works for me:
import occt
# Geom_CartesianPoint a sub-class of Geom_Point;
var aPnt1: Handle[Geom_Point]
var aPnt2, aPnt3: Handle[Geom_CartesianPoint]
assert(`*`(aPnt2) of Geom_Point)
assert(`*`(aPnt2) of Geom_CartesianPoint)
aPnt2 = newHandle( cnew newGeomCartesianPoint(1.0,2.0,3.0) )
aPnt1 = newHandle( cast[ptr Geom_Point](aPnt2.get) )
assert (`*`(aPnt1).x) == (`*`(aPnt2).x)
aPnt3 = newHandle( cast[ptr Geom_CartesianPoint](aPnt1.get) )
assert (`*`(aPnt1).x) == (`*`(aPnt3).x)
Run
I am not sure if there is any better way of doing so.
