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[pccts] / h / ATokPtr.h

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+/* ATokPtr.h
+ *
+ * SOFTWARE RIGHTS
+ *
+ * We reserve no LEGAL rights to the Purdue Compiler Construction Tool
+ * Set (PCCTS) -- PCCTS is in the public domain.  An individual or
+ * company may do whatever they wish with source code distributed with
+ * PCCTS or the code generated by PCCTS, including the incorporation of
+ * PCCTS, or its output, into commerical software.
+ * 
+ * We encourage users to develop software with PCCTS.  However, we do ask
+ * that credit is given to us for developing PCCTS.  By "credit",
+ * we mean that if you incorporate our 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 PCCTS and have developed a nice tool with the
+ * output, please mention that you developed it using PCCTS.  In
+ * addition, we ask that this header 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.
+ *
+ * ANTLR 1.33
+ * Written by Russell Quong June 30, 1995
+ * Adapted by Terence Parr to ANTLR stuff
+ * Parr Research Corporation
+ * with Purdue University and AHPCRC, University of Minnesota
+ * 1989-1995
+ */
+
+#ifndef ATokPtr_h
+#define ATokPtr_h
+
+// pointer to a reference counted object
+// robust in that an unused ANTLRTokenPtr can point to NULL.
+
+class ANTLRAbstractToken;
+
+class ANTLRTokenPtr {
+public:
+    ANTLRTokenPtr(ANTLRAbstractToken *addr=NULL){ptr_ = addr; ref();}
+    ANTLRTokenPtr(const ANTLRTokenPtr &lhs)    {ptr_ = lhs.ptr_; lhs.ref();}
+    ~ANTLRTokenPtr();
+
+    // use ANTLRTokenPtr as a pointer to ANTLRToken
+    ANTLRAbstractToken *operator-> () { return ptr_; }
+    void operator = (const ANTLRTokenPtr lhs);
+    void operator = (ANTLRAbstractToken *addr);
+    unsigned operator != (const ANTLRTokenPtr &q)
+       { return this->ptr_ != q.ptr_; }
+    unsigned operator == (const ANTLRTokenPtr &q)
+       { return this->ptr_ == q.ptr_; }
+    void ref() const;
+    void deref();
+
+protected:
+    ANTLRAbstractToken *ptr_;
+};
+
+//typedef ANTLRTokenPtr _ANTLRTokenPtr;
+
+/*
+ * Since you cannot redefine operator->() to return one of the user's
+ * token object types, we must down cast.  This is a drag.  Here's
+ * a macro that helps.  template: "mytoken(a-smart-ptr)->myfield".
+ */
+#define mytoken(tk) ((ANTLRToken *)(tk.operator->()))
+
+#endif