Security-55471.tar.gz

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

diff --git a/libsecurity_codesigning/antlr2/antlr/ASTRefCount.hpp b/libsecurity_codesigning/antlr2/antlr/ASTRefCount.hpp
new file mode 100644 (file)
index 0000000..293f2d5
--- /dev/null
+++ b/libsecurity_codesigning/antlr2/antlr/ASTRefCount.hpp
@@ -0,0 +1,98 @@
+#ifndef INC_ASTRefCount_hpp__
+# define INC_ASTRefCount_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/ASTRefCount.hpp#2 $
+ */
+
+# include <antlr/config.hpp>
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+namespace antlr {
+#endif
+
+       class AST;
+
+struct ANTLR_API ASTRef
+{
+       AST* const ptr;
+       unsigned int count;
+
+       ASTRef(AST* p);
+       ~ASTRef();
+       ASTRef* increment()
+       {
+               ++count;
+               return this;
+       }
+       bool decrement()
+       {
+               return (--count==0);
+       }
+
+       static ASTRef* getRef(const AST* p);
+private:
+       ASTRef( const ASTRef& );
+       ASTRef& operator=( const ASTRef& );
+};
+
+template<class T>
+       class ANTLR_API ASTRefCount
+{
+private:
+       ASTRef* ref;
+
+public:
+       ASTRefCount(const AST* p=0)
+       : ref(p ? ASTRef::getRef(p) : 0)
+       {
+       }
+       ASTRefCount(const ASTRefCount<T>& other)
+       : ref(other.ref ? other.ref->increment() : 0)
+       {
+       }
+       ~ASTRefCount()
+       {
+               if (ref && ref->decrement())
+                       delete ref;
+       }
+       ASTRefCount<T>& operator=(AST* other)
+       {
+               ASTRef* tmp = ASTRef::getRef(other);
+
+               if (ref && ref->decrement())
+                       delete ref;
+
+               ref=tmp;
+
+               return *this;
+       }
+       ASTRefCount<T>& operator=(const ASTRefCount<T>& other)
+       {
+               if( other.ref != ref )
+               {
+                       ASTRef* tmp = other.ref ? other.ref->increment() : 0;
+
+                       if (ref && ref->decrement())
+                               delete ref;
+
+                       ref=tmp;
+               }
+               return *this;
+       }
+
+       operator T* ()  const { return ref ? static_cast<T*>(ref->ptr) : 0; }
+       T* operator->() const { return ref ? static_cast<T*>(ref->ptr) : 0; }
+       T* get()        const { return ref ? static_cast<T*>(ref->ptr) : 0; }
+};
+
+typedef ASTRefCount<AST> RefAST;
+
+#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
+}
+#endif
+
+#endif //INC_ASTRefCount_hpp__