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diff --git a/sample/subtly/character_predicate.h b/sample/subtly/character_predicate.h
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+/*
+ * Copyright 2011 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef TYPOGRAPHY_FONT_SFNTLY_SRC_SAMPLE_SUBTLY_CHARACTER_PREDICATE_H_
+#define TYPOGRAPHY_FONT_SFNTLY_SRC_SAMPLE_SUBTLY_CHARACTER_PREDICATE_H_
+
+#include "sfntly/port/refcount.h"
+#include "sfntly/port/type.h"
+
+namespace subtly {
+class CharacterPredicate : virtual public sfntly::RefCount {
+ public:
+  CharacterPredicate() {}
+  virtual ~CharacterPredicate() {}
+  virtual bool operator()(int32_t character) const = 0;
+};
+
+// All characters except for those between [start, end] are rejected
+class AcceptRange : public CharacterPredicate,
+                    public sfntly::RefCounted<AcceptRange> {
+ public:
+  AcceptRange(int32_t start, int32_t end);
+  ~AcceptRange();
+  virtual bool operator()(int32_t character) const;
+
+ private:
+  int32_t start_;
+  int32_t end_;
+};
+
+// All characters in IntegerSet
+// The set is OWNED by the predicate! Do not modify it.
+// It will be freed when the predicate is destroyed.
+class AcceptSet : public CharacterPredicate,
+                  public sfntly::RefCounted<AcceptSet> {
+ public:
+  explicit AcceptSet(sfntly::IntegerSet* characters);
+  ~AcceptSet();
+  virtual bool operator()(int32_t character) const;
+
+ private:
+  sfntly::IntegerSet* characters_;
+};
+
+// All characters
+class AcceptAll : public CharacterPredicate,
+                  public sfntly::RefCounted<AcceptAll> {
+ public:
+  AcceptAll() {}
+  ~AcceptAll() {}
+  virtual bool operator()(int32_t character) const;
+};
+}
+
+#endif  // TYPOGRAPHY_FONT_SFNTLY_SRC_SAMPLE_SUBTLY_CHARACTER_PREDICATE_H_