BaseTools/Source/C/VfrCompile/Pccts/h/ATokPtrImpl.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 }