On 2019-Sep-22, Dmitry Dolgov wrote:
> > I think multiplying two ScanDirections to watch for a negative result is
> > pretty ugly:
>
> Probably, but the only alternative I see to check if directions are opposite is
> to check that directions come in pairs (back, forth), (forth, back). Is there
> an easier way?
Maybe use the ^ operator?
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Álvaro Herrera https://www.2ndQuadrant.com/
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