[ C++ ] sorting with index

#include<iostream>
#include<algorithm>
using namespace std;

struct Comparator
{
    Comparator(const int* data) : m_data(data) {}
    bool operator() (int left, int right) const { return m_data[left] < m_data[right]; }
    const int* m_data;
};

int main()
{
  int data[] = {16,2,77,29};
  int index[] = {0,1,2,3};
  std::sort(index, index + sizeof(index) / sizeof(int), Comparator(data));
  for (int i = 0; i < sizeof(index) / sizeof(int); ++i) {
    cout << index[i] << "\t";
  }
  return 0;
}



                            - http://blog.csdn.net/niuqingpeng/article/details/12649815