text: #ifndef SList_h
  #define SList_h
  
  /*
   * SList.h
   *
   * SOFTWARE RIGHTS
   *
   * We reserve no LEGAL rights to SORCERER -- SORCERER is in the public
   * domain.  An individual or company may do whatever they wish with
   * source code distributed with SORCERER or the code generated by
   * SORCERER, including the incorporation of SORCERER, or its output, into
   * commerical software.
   *
   * We encourage users to develop software with SORCERER.  However, we do
   * ask that credit is given to us for developing SORCERER.  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 SORCERER and have developed a nice tool with the
   * output, please mention that you developed it using SORCERER.  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.
   *
   * PCCTS 1.33
   * Terence Parr
   * Parr Research Corporation
   * with Purdue University and AHPCRC, University of Minnesota
   * 1992-2000
   */
  
  #include "pcctscfg.h"
  
  #include "pccts_stdio.h"
  #include "pccts_stdlib.h"
  
  PCCTS_NAMESPACE_STD
  
  #include "PCCTSAST.h"
  
  class PCCTS_AST;
  
  class SListNode {
  protected:
  	void *_elem;			/* pointer to any kind of element */
  	SListNode *_next;
  public:
  	SListNode()				{_elem=_next=NULL;}
  	virtual ~SListNode()	{_elem=_next=NULL;}
  	void *elem()			{ return _elem; }
  	void setElem(void *e)	{ _elem = e; }
  	void setNext(SListNode *t)	{ _next = t; }
  	SListNode *next()		{ return _next; }
  };
  
  class SList {
  	SListNode *head, *tail;
  public:
  	SList() {head=tail=NULL;}
  	virtual ~SList() {head=tail=NULL;}
  	virtual void *iterate(SListNode **);
  	virtual void add(void *e);
  	virtual void lfree();
  	virtual PCCTS_AST *to_ast(SList list);
  	virtual void require(int e,char *err){ if ( !e ) panic(err); }
  	virtual void panic(char *err){ /* MR23 */ printMessage(stderr, "SList panic: %s\n", err); exit(PCCTS_EXIT_FAILURE); }
  	virtual int printMessage(FILE* pFile, const char* pFormat, ...); // MR23
  };
  
  #endif
  