Confusing Errors

Hi I keep getting these errors (using g++ on UNIX)...

vehicle_array.cc: In member function `void
vehicle_array::remove_reg(vehicle_reg&)':
vehicle_array.cc:72: error: no match for `vehicle_reg& == vehicle_reg&'
operator
vehicle_array.cc:79: error: name lookup of `i' changed for new ISO `for'
scoping
vehicle_array.cc:71: error: using obsolete binding at `i'

Here's the snipet of code it is referring to:

Code:

---

void vehicle_array::remove_reg(vehicle_reg& tmp){

bool ctrl = false;

for(int i = 0; i < used; i++){ //line 71
  if(veh_arr[i] == tmp){      //line 72
    ctrl = true;
break;
  }
}

if(ctrl){
  for(i ; i < used; i++){      //line 79
    veh_arr[i] = veh_arr[i + 1];
  }
  used--;
 }
}

---

Our instructor told us that the == operator was already overloaded for classes. Is this true? It seems to not be working in this case. I also understand this code is sorta messy, sorry. Any help would be appreciated though.

operator== (equality comparison) is not automatically overloaded for classes. Perhaps your teacher said that operator= (assignment) was automatically overloaded for classes? You will have to write operator== yourself.

As for the other error,

Code:

---

for(int i=0; i<5; ++i)
  do_something();
cout << i;  /* illegal.  the variable i went out of scope at the end of the for loop */

---

If you want to use i after that for loop, then declare it outside of the for loop.