diff -r 000000000000 -r 6474c204b198 dom/smil/nsSMILRepeatCount.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/smil/nsSMILRepeatCount.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,61 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsSMILRepeatCount_h
+#define nsSMILRepeatCount_h
+
+#include "nsDebug.h"
+#include <math.h>
+
+//----------------------------------------------------------------------
+// nsSMILRepeatCount
+//
+// A tri-state non-negative floating point number for representing the number of
+// times an animation repeat, i.e. the SMIL repeatCount attribute.
+//
+// The three states are:
+//  1. not-set
+//  2. set (with non-negative, non-zero count value)
+//  3. indefinite
+//
+class nsSMILRepeatCount
+{
+public:
+  nsSMILRepeatCount() : mCount(kNotSet) {}
+  explicit nsSMILRepeatCount(double aCount)
+    : mCount(kNotSet) { SetCount(aCount); }
+
+  operator double() const {
+    MOZ_ASSERT(IsDefinite(),
+      "Converting indefinite or unset repeat count to double");
+    return mCount;
+  }
+  bool IsDefinite() const {
+    return mCount != kNotSet && mCount != kIndefinite;
+  }
+  bool IsIndefinite() const { return mCount == kIndefinite; }
+  bool IsSet() const { return mCount != kNotSet; }
+
+  nsSMILRepeatCount& operator=(double aCount)
+  {
+    SetCount(aCount);
+    return *this;
+  }
+  void SetCount(double aCount)
+  {
+    NS_ASSERTION(aCount > 0.0, "Negative or zero repeat count");
+    mCount = aCount > 0.0 ? aCount : kNotSet;
+  }
+  void SetIndefinite() { mCount = kIndefinite; }
+  void Unset() { mCount = kNotSet; }
+
+private:
+  static const double kNotSet;
+  static const double kIndefinite;
+
+  double  mCount;
+};
+
+#endif