1 files changed, 80 insertions, 0 deletions
diff --git a/lib/antlr/antlr/RefCount.hpp b/lib/antlr/antlr/RefCount.hpp
new file mode 100644
index 00000000..8546a049
--- /dev/null
+++ b/lib/antlr/antlr/RefCount.hpp
@@ -0,0 +1,80 @@
+#ifndef INC_RefCount_hpp__
+#define INC_RefCount_hpp__
+/* ANTLR Translator Generator
+ * Project led by Terence Parr at http://www.jGuru.com
+ * Software rights: http://www.antlr.org/license.html
+ *
+ * $Id$
+ */
+
+#include <antlr/config.hpp>
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+namespace antlr {
+#endif
+
+template<class T>
+class ANTLR_API RefCount {
+private:
+	struct Ref {
+		T* const ptr;
+		unsigned int count;
+
+		Ref(T* p) : ptr(p), count(1) {}
+		~Ref() {delete ptr;}
+		Ref* increment() {++count;return this;}
+		bool decrement() {return (--count==0);}
+	private:
+		Ref(const Ref&);
+		Ref& operator=(const Ref&);
+	}* ref;
+
+public:
+	explicit RefCount(T* p = 0)
+	: ref(p ? new Ref(p) : 0)
+	{
+	}
+	RefCount(const RefCount<T>& other)
+	: ref(other.ref ? other.ref->increment() : 0)
+	{
+	}
+	~RefCount()
+	{
+		if (ref && ref->decrement())
+			delete ref;
+	}
+	RefCount<T>& operator=(const RefCount<T>& other)
+	{
+		Ref* tmp = other.ref ? other.ref->increment() : 0;
+		if (ref && ref->decrement())
+			delete ref;
+		ref = tmp;
+		return *this;
+	}
+
+	operator T* () const
+	{
+		return ref ? ref->ptr : 0;
+	}
+
+	T* operator->() const
+	{
+		return ref ? ref->ptr : 0;
+	}
+
+	T* get() const
+	{
+		return ref ? ref->ptr : 0;
+	}
+
+	template<class newType> operator RefCount<newType>()
+	{
+		return RefCount<newType>(ref);
+	}
+};
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+}
+#endif
+
+#endif //INC_RefCount_hpp__