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diff --git a/poxml/antlr/antlr/BitSet.hpp b/poxml/antlr/antlr/BitSet.hpp
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+++ b/poxml/antlr/antlr/BitSet.hpp
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+#ifndef INC_BitSet_hpp__
+#define INC_BitSet_hpp__
+
+#include "antlr/config.hpp"
+#include <vector>
+#include <stdexcept>
+
+ANTLR_BEGIN_NAMESPACE(antlr)
+
+/**A BitSet to replace java.util.BitSet.
+ * Primary differences are that most set operators return new sets
+ * as opposed to oring and anding "in place".  Further, a number of
+ * operations were added.  I cannot contain a BitSet because there
+ * is no way to access the internal bits (which I need for speed)
+ * and, because it is final, I cannot subclass to add functionality.
+ * Consider defining set degree.  Without access to the bits, I must
+ * call a method n times to test the ith bit...ack!
+ *
+ * Also seems like or() from util is wrong when size of incoming set is bigger
+ * than this.length.
+ *
+ *
+ * This is a C++ version of the Java class described above, with only
+ * a handful of the methods implemented, because we don't need the
+ * others at runtime. It's really just a wrapper around vector<bool>,
+ * which should probably be changed to a wrapper around bitset, once
+ * bitset is more widely available.
+ *
+ * @author Terence Parr, MageLang Institute
+ * @author <br><a href="mailto:pete@yamuna.demon.co.uk">Pete Wells</a>
+ */
+class BitSet {
+private:
+	ANTLR_USE_NAMESPACE(std)vector<bool> storage;
+
+public:
+	BitSet(int nbits=64);
+	BitSet(const unsigned long* bits_,int nlongs);
+	~BitSet();
+
+	void add(int el);
+
+	bool member(int el) const;
+
+	ANTLR_USE_NAMESPACE(std)vector<int> toArray() const;
+};
+
+ANTLR_END_NAMESPACE
+
+#endif //INC_BitSet_hpp__