1 files changed, 87 insertions, 0 deletions
diff --git a/poxml/antlr/antlr/RefCount.hpp b/poxml/antlr/antlr/RefCount.hpp
new file mode 100644
index 00000000..9306576b
--- /dev/null
+++ b/poxml/antlr/antlr/RefCount.hpp
@@ -0,0 +1,87 @@
+#ifndef INC_RefCount_hpp__
+#define INC_RefCount_hpp__
+
+/**
+ * <b>SOFTWARE RIGHTS</b>
+ * <p>
+ * ANTLR 2.6.0 MageLang Insitute, 1999
+ * <p>
+ * We reserve no legal rights to the ANTLR--it is fully in the
+ * public domain. An individual or company may do whatever
+ * they wish with source code distributed with ANTLR or the
+ * code generated by ANTLR, including the incorporation of
+ * ANTLR, or its output, into commerical software.
+ * <p>
+ * We encourage users to develop software with ANTLR. However,
+ * we do ask that credit is given to us for developing
+ * ANTLR. By "credit", we mean that if you use ANTLR or
+ * incorporate any source code into one of your programs
+ * (commercial product, research project, or otherwise) that
+ * you acknowledge this fact somewhere in the documentation,
+ * research report, etc... If you like ANTLR and have
+ * developed a nice tool with the output, please mention that
+ * you developed it using ANTLR. In addition, we ask that the
+ * headers remain intact in our source code. As long as these
+ * guidelines are kept, we expect to continue enhancing this
+ * system and expect to make other tools available as they are
+ * completed.
+ * <p>
+ * The ANTLR gang:
+ * @version ANTLR 2.6.0 MageLang Insitute, 1999
+ * @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
+ * @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
+ * @author <br><a href="mailto:pete@yamuna.demon.co.uk">Pete Wells</a>
+ */
+
+#include "antlr/config.hpp"
+
+ANTLR_BEGIN_NAMESPACE(antlr)
+
+template<class T>
+class 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; }
+};
+
+ANTLR_END_NAMESPACE
+
+#endif //INC_RefCount_hpp__