// An example of a C++ class tha does
// not have memory leaks.

Filter::Filter() {
  buf = 0;
}
Filter::AllocateBuffer(int n) {
  DeallocateBuffer();
  buf = new int [n];
  if (buf == 0) {
     cerr << “allocation failed”;
     exit(0);
  }
  memset(buf, 0, n* sizeof(int));
}
Filter::DeallocateBuffer() {
  delete [] buf;
  buf = 0;
}
Filter::~Filter() {
  DeallocateBuffer();
}