[Bioc-devel] How to use initializing functions correctly ?

Note that the GPos() constructor is NOT the generator function returned by
the setClass() statement that defines the GPos class. It's a constructor
function defined in the GenomicRanges package and it implements a
sophisticated logic.

HOWEVER, please note that trying to support the 'stitch' argument does not
make sense in a context where the newGPos class extends the UnstitchedGPos
class. So you might want to do something like this instead:

## newGPos() has the same arguments as the GPos() constructor **except**
## the 'stitch' argument.
newGPos <- function (seqnames=NULL, pos=NULL, strand=NULL,
                     ..., seqinfo=NULL, seqlengths=NULL)
{
    gpos <- GPos(seqnames=seqnames, pos=pos, strand=strand,
                 ..., seqinfo=seqinfo, seqlengths=seqlengths,
                 stitch=FALSE)
    new("newGPos", gpos)
}