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A model of this concept must provide:
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ArrDirectionalTraits::X_monotone_curve_2 | operator() (ArrDirectionalTraits::X_monotone_curve_2 xc) |
| accepts an \( x\)-monotone curve xc and returns its opposite curve, namely a curve whose graph is the same as xc 's, and whose source and target are swapped with respect to xc 's source and target.
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