c++ - Cplusplus std::set of bidimensional array -


i'm new c++ , need use set stl i'm struggling concept.

i have array int my_data[3]

i want create (don't know if possible) set space 3 ints , key set int stored on first column.

i want make custom sort.

this i've tried no success.

struct sort_set {     bool operator() (const int& a, const int& b) const {         int* arr1 = (int*) a;         int* arr2 = (int*) b;         int diff = arr2[1] - arr1[1];         if (diff) {             return true;         } else if (diff == 0) {             int diff2 = arr2[2] - arr1[2];             if (diff2) {                 return false;             }          }         return arr1[0] < arr2[0];     } };  set<int[3],sort_set> data;

can point me in right direction?

you cannot have arrays elements of containers. they're not assignable nor copyable.

use std::array<int, 3> if have c++11 avaliable, or define custom class otherwise.


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