gistfile1.cpp

{
  int nr;
  CriuVethPair **a, *p;
  p = malloc(sizeof(*p));
  if (!p)
    goto er;
  criu_veth_pair__init(p);
  p->if_in = strdup(in);
  if (!p->if_in)
    goto er_p;
  p->if_out = strdup(out);
  if (!p->if_out)
    goto er_i;
  nr = opts->n_veths + 1;
  a = realloc(opts->veths, nr * sizeof(p));
  if (!a)
    goto er_o;
  a[nr - 1] = p;
  opts->veths = a;
  opts->n_veths = nr;
  return 0;
 er_o:
  free(p->if_out);
 er_i:
  free(p->if_in);
 er_p:
  free(p);
 er:
  return -ENOMEM;
}

// ---vs---
{
  vector<shared_ptr<CriuVethPair>> a = opts->veths;
  try {
    shared_ptr<CriuVethPair> p = new CruiVethPair; //throws if failed to allocate
    //  constructor calls everything else: criu_veth_pair__init(p);
    a.push(p);  //throws if failed to fit a new element. (reallocates automatically)
    opts->n_veths = a.size();
    return 0;
  } catch (...) {
    return -ENOMEM;
  }
}