Utility for observing C++ object copying/moving

copy_move_observer.cpp

#include <vector>
#include <string>
#include <iostream>

using namespace std;

struct obs {
  obs() : m_mv(0), m_cp(0) { m_regs.insert(this); }
  obs(obs const &cp) { m_regs.insert(this); m_cp++; m_total_cp++;}
  obs(obs &&mv) { m_regs.insert(this); m_mv++; m_total_mv++;}
  obs &operator=(obs const &cp) { m_regs.insert(this); m_cp++; m_total_cp++; }
  obs &operator=(obs const &&mv) { m_regs.insert(this); m_mv++; m_total_mv++;}
  void reset() { m_cp = 0; m_mv = 0; }
  static void reset_all() { m_total_mv = m_total_cp = 0; }
  static void print_cnt() {
    cout << "total mv: " <<
      obs::m_total_mv <<
      ", cp: " << obs::m_total_cp << "\n"
      ;
    for (auto &it : m_regs){
      cout << it <<
        ", mv: " << it->m_mv <<
        ", cp: " << it->m_cp <<
        "\n"
        ;
      it->reset();
    }
    reset_all();
  }
  int m_mv, m_cp;
  static int m_total_mv, m_total_cp;
  static set<obs *> m_regs;
};

int obs::m_total_mv(0);
int obs::m_total_cp(0);
set<obs*> obs::m_regs;

// wrap
struct obs_string : string, obs {
  using string::string;
};

int main(){
  vector<obs_string> items{"abc", "123", "bcd"};
  obs::print_cnt();
  return 0;
}