Home | History | Annotate | Download | only in h 
      1 /*
      2  * ATokPtrImpl.h (formerly ATokPtr.cpp)
      3  *
      4  * This is #included in ATokBuffer.cpp for historical reasons.
      5  * It has been renamed because of problems with the .cpp extension
      6  * when used with IDE.
      7  *
      8  *
      9  * ANTLRToken MUST be defined before entry to this file.
     10  *
     11  * SOFTWARE RIGHTS
     12  *
     13  * We reserve no LEGAL rights to the Purdue Compiler Construction Tool
     14  * Set (PCCTS) -- PCCTS is in the public domain.  An individual or
     15  * company may do whatever they wish with source code distributed with
     16  * PCCTS or the code generated by PCCTS, including the incorporation of
     17  * PCCTS, or its output, into commerical software.
     18  *
     19  * We encourage users to develop software with PCCTS.  However, we do ask
     20  * that credit is given to us for developing PCCTS.  By "credit",
     21  * we mean that if you incorporate our source code into one of your
     22  * programs (commercial product, research project, or otherwise) that you
     23  * acknowledge this fact somewhere in the documentation, research report,
     24  * etc...  If you like PCCTS and have developed a nice tool with the
     25  * output, please mention that you developed it using PCCTS.  In
     26  * addition, we ask that this header remain intact in our source code.
     27  * As long as these guidelines are kept, we expect to continue enhancing
     28  * this system and expect to make other tools available as they are
     29  * completed.
     30  *
     31  * ANTLR 1.33
     32  * Written by Russell Quong June 30, 1995
     33  * Adapted by Terence Parr to ANTLR stuff
     34  * Parr Research Corporation
     35  * with Purdue University and AHPCRC, University of Minnesota
     36  * 1989-2000
     37  */
     38 
     39 #include "pcctscfg.h"
     40 
     41 PCCTS_NAMESPACE_STD
     42 
     43 #include "ATokPtr.h"
     44 
     45 void ANTLRTokenPtr::ref() const
     46 {
     47     if (ptr_ != NULL) {
     48 		ptr_->ref();
     49 	}
     50 }
     51 
     52 void ANTLRTokenPtr::deref()
     53 {
     54     if (ptr_ != NULL)
     55     {
     56 		ptr_->deref();
     57 		if ( ptr_->nref()==0 )
     58 		{
     59 		    delete ptr_;
     60 			ptr_ = NULL;
     61 		}
     62     }
     63 }
     64 
     65 ANTLRTokenPtr::~ANTLRTokenPtr()
     66 {
     67     deref();
     68 }
     69 
     70 //
     71 //  8-Apr-97	MR1	Make operator -> a const member function
     72 //			  as weall as some other member functions
     73 //
     74 ANTLRTokenPtr& ANTLRTokenPtr::operator = (const ANTLRTokenPtr & lhs)    // MR1
     75 {
     76     lhs.ref();	// protect against "xp = xp"; ie same underlying object
     77     deref();
     78     ptr_ = lhs.ptr_;
     79     return *this;
     80 }
     81 
     82 ANTLRTokenPtr& ANTLRTokenPtr::operator = (ANTLRAbstractToken *addr)
     83 {
     84     if (addr != NULL) {
     85 	addr->ref();
     86     }
     87     deref();
     88     ptr_ = addr;
     89     return *this;
     90 }
     91