// This function can accept any kind of random access iterators for the int type
void your_function(virtual_random_access_iterator<int> first, virtual_random_access_iterator<int> last)
{
    std::sort(first, last); // or whatever you want
}

int main() {
    std::vector<int> v(100);
    int *a = new int[100];
    // ...
    your_function(v.begin(), v.end());
    your_function(a, a + 100);
    // ...
}