Assignment Operator 3

• Second Attempt: take care of old memory allocation

IntArray& IntArray::operator =(const IntArray& b)
{
  delete [] data_;
  size_ = b.size_;
  data_ = new int [size_];
  // check for failed allocation
  for (size_t i = 0; i < size_; ++i)
    data_[i] = b.data_[i];
  return *this;
}

• Problem: self-assignment