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| bool | fo.operator() ( Kernel::Point_3 p, Kernel::Point_3 q) | |
| returns true iff the x-coordinate of p is smaller than the x-coordinate of q or if the are the same and the y-coordinate of p is smaller than the y-coordinate of q, or, if both x- and y- coordinate are identical and the z-coordinate of p is smaller than the z-coordinate of q. | ||