example.cpp

static ProfileCounter counter_one("profiled_function");

void profiled_function()
{
  ...
  {
    ProfileGuard g(&counter_one);
    do_some_timed_activity();
  }
  ...
}

very_poor_mans_profiler.hpp

class ProfileCounter
{
  string name;
  long calls;
  clock_t total_time;
  clock_t last_call;
  
  ProfileCounter(string aname): name(aname), calls(0), total_time(0), last_call(0) {}

  ~ProfileCounter()
  {
    if (calls > 0) {
      std::cout << "Profiler " << name << ": " << " no calls\n";
    } else {
      std::cout << "Profiler " << name << ": " << calls << " calls, " << ((double) total_time) / calls / CLOCKS_PER_SEC << "s average\n";
    }
  }
}

class ProfileGuard
{
  ProfileCounter *counter;
  ProfileGuard(ProfileCounter *a_counter): counter(a_counter)
  {
    counter->calls++;
    counter->last_call = clock();
  }

  ~ProfileGuard()
  {
    counter->total_time += clock() - last_call;
  }
}