sinterface IIntMemory {
  int get(int idx); // idx = unsigned int
  default int read(int idx) { ret get(idx); }
  void set(int idx, int val);
  long size(); // in ints
  
  default int[] readArray(int start, int len) {
    int[] a = new[len];
    for i to len:
      a[i] = get(start+i);
    ret a;
  }
  
  default long getLong(int idx) {
    ret twoIntsToLong(get(idx), get(idx+1));
  }
  
  default void setLong(int idx, long val) {
    set(idx, firstIntFromLong(val));
    set(idx+1, secondIntFromLong(val));
  }
  
  default void ensureSize(int size) { unimplemented(); }
}