Security-55471.tar.gz

[apple/security.git] / libsecurity_codesigning / antlr2 / antlr / RefCount.hpp

diff --git a/libsecurity_codesigning/antlr2/antlr/RefCount.hpp b/libsecurity_codesigning/antlr2/antlr/RefCount.hpp
new file mode 100644 (file)
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+++ b/libsecurity_codesigning/antlr2/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: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/RefCount.hpp#2 $
+ */
+
+#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__