43     int operator()(int x1)  in operator ()()
45         return x1;  in operator ()()
48     int operator()(int x1) const  in operator ()()
50         return -x1;  in operator ()()
53     int operator()(int x1, int x2)  in operator ()()
55         return x1+x2;  in operator ()()
58     int operator()(int x1, int x2) const  in operator ()()
60         return -(x1+x2);  in operator ()()
63     int operator()(int x1, int x2, int x3)  in operator ()()
65         return x1+x2+x3;  in operator ()()
68     int operator()(int x1, int x2, int x3) const  in operator ()()
70         return -(x1+x2+x3);  in operator ()()
73     int operator()(int x1, int x2, int x3, int x4)  in operator ()()
75         return x1+x2+x3+x4;  in operator ()()
78     int operator()(int x1, int x2, int x3, int x4) const  in operator ()()
80         return -(x1+x2+x3+x4);  in operator ()()
83     int operator()(int x1, int x2, int x3, int x4, int x5)  in operator ()()
85         return x1+x2+x3+x4+x5;  in operator ()()
88     int operator()(int x1, int x2, int x3, int x4, int x5) const  in operator ()()
90         return -(x1+x2+x3+x4+x5);  in operator ()()
93     int operator()(int x1, int x2, int x3, int x4, int x5, int x6)  in operator ()()
95         return x1+x2+x3+x4+x5+x6;  in operator ()()
98     int operator()(int x1, int x2, int x3, int x4, int x5, int x6) const  in operator ()()
100         return -(x1+x2+x3+x4+x5+x6);  in operator ()()
103     int operator()(int x1, int x2, int x3, int x4, int x5, int x6, int x7)  in operator ()()
105         return x1+x2+x3+x4+x5+x6+x7;  in operator ()()
108     int operator()(int x1, int x2, int x3, int x4, int x5, int x6, int x7) const  in operator ()()
110         return -(x1+x2+x3+x4+x5+x6+x7);  in operator ()()
113     int operator()(int x1, int x2, int x3, int x4, int x5, int x6, int x7, int x8)  in operator ()()
115         return x1+x2+x3+x4+x5+x6+x7+x8;  in operator ()()
118     int operator()(int x1, int x2, int x3, int x4, int x5, int x6, int x7, int x8) const  in operator ()()
120         return -(x1+x2+x3+x4+x5+x6+x7+x8);  in operator ()()
123     int operator()(int x1, int x2, int x3, int x4, int x5, int x6, int x7, int x8, int x9)  in operator ()()
125         return x1+x2+x3+x4+x5+x6+x7+x8+x9;  in operator ()()
128     int operator()(int x1, int x2, int x3, int x4, int x5, int x6, int x7, int x8, int x9) const  in operator ()()
130         return -(x1+x2+x3+x4+x5+x6+x7+x8+x9);  in operator ()()