static boolean empty(Collection c) { ret c == null || c.isEmpty(); }

static boolean empty(Iterable c) { ret c == null || !c.iterator().hasNext(); }

static boolean empty(CharSequence s) { ret s == null || s.length() == 0; }

static boolean empty(Map map) { ret map == null || map.isEmpty(); }

static boolean empty(O[] o) { ret o == null || o.length == 0; }

sbool empty(BitSet bs) { ret bs == null || bs.isEmpty(); }

ifndef empty_noGeneric

static boolean empty(O o) {

  if (o instanceof Collection) ret empty((Collection) o);

  if (o instanceof S) ret empty((S) o);

  if (o instanceof Map) ret empty((Map) o);

  if (o instanceof O[]) ret empty((O[]) o);

  if (o instanceof byte[]) ret empty((byte[]) o);

  if (o == null) true;

  throw fail("unknown type for 'empty': " + getType(o));

}

endifndef

sbool empty(Iterator i) { ret i == null || !i.hasNext(); }

static bool empty(double[] a) { ret a == null || a.length == 0; }

static bool empty(float[] a) { ret a == null || a.length == 0; }

static bool empty(int[] a) { ret a == null || a.length == 0; }

static bool empty(long[] a) { ret a == null || a.length == 0; }

static bool empty(byte[] a) { ret a == null || a.length == 0; }

static bool empty(short[] a) { ret a == null || a.length == 0; }

ifclass MultiSet

static bool empty(MultiSet ms) { ret ms == null || ms.isEmpty(); }

endif

ifclass IMultiMap

static bool empty(IMultiMap mm) { ret mm == null || mm.size() == 0; }

endif

sbool empty(File f) { ret getFileSize(f) == 0; }

ifclass IntRange

sbool empty(IntRange r) { ret r == null || r.empty(); }

endif

ifclass DoubleRange

sbool empty(DoubleRange r) { ret r == null || r.isEmpty(); }

endif

ifclass IntBuffer

sbool empty(IntBuffer b) { ret b == null || b.isEmpty(); }

endif

ifclass LongBuffer

sbool empty(LongBuffer b) { ret b == null || b.isEmpty(); }

endif

ifclass SynchronizedLongBuffer

sbool empty(SynchronizedLongBuffer b) { ret b == null || b.isEmpty(); }

endif

ifclass DoubleBuffer

sbool empty(DoubleBuffer b) { ret b == null || b.isEmpty(); }

endif

ifclass SynchronizedDoubleBuffer

sbool empty(SynchronizedDoubleBuffer b) { ret b == null || b.isEmpty(); }

endif

ifclass SynchronizedFloatBufferPresentingAsDoubles

sbool empty(SynchronizedFloatBufferPresentingAsDoubles b) { ret b == null || b.isEmpty(); }

endif

ifclass IDoubleBuffer

sbool empty(IDoubleBuffer b) { ret b == null || b.isEmpty(); }

endif

ifclass ILongBuffer

sbool empty(ILongBuffer b) { ret b == null || b.isEmpty(); }

endif

ifclass Rect

sbool empty(Rect r) { ret !(r != null && r.w != 0 && r.h != 0); }

endif

ifclass Chain

sbool empty(Chain c) { ret c == null; }

endif

ifclass AppendableChain

sbool empty(AppendableChain c) { ret c == null; }

endif

sbool empty(IntSize l) { ret l == null || l.size() == 0; }