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| Comparison_result | fo.operator() ( Type1 obj1, Type2 obj2, Type3 obj3) | |
| compares the squared distance between obj1 and obj2 to the squared distance between obj1 and obj3 | ||
| Comparison_result | fo.operator() ( Type1 obj1, Type2 obj2, Type3 obj3, Type4 obj4) | |
| compares the squared distance between obj1 and obj2 to the squared distance between obj3 and obj4 | ||