void Gdk::Colormap::freeColors(Color& colors, int ncolors)



what is meant with "ncolors The number of colors in colors" at
http://www.gtkmm.org/docs/gtkmm-2.4/docs/reference/html/classGdk_1_1Colormap.html#a6

how can one Color& stand for, let's say three colors ?
thanks,
           antonio



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