C++ increment ++ operator overloading -

i know how overload operator += if using class e.g.

class temp { public:     int i;     temp(){ = 10; }     int operator+=(int k)     {            return i+=k;     } }; int main() {     temp var;     var += 67;     cout << var.i;     return 0; } 

but why cant create overloaded += function basic datatype

int operator+=(int v, int h) {     return  v += (2*h); } int main() {     int var = 10;     var += 67;     cout << i;     return 0; } 

i getting error when compiling above overloaded function.

operator overloading not supported primitive types. these operations performed direct cpu instructions. reason though, code overloads basic arithmetic functions impossible maintain.