langviz/Node.hh

   1 /******************************************************************************
   2  * Copyright (c) 2000-2016 Ericsson Telecom AB
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Eclipse Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/epl-v10.html
   7  *
   8  * Contributors:
   9  *   Balasko, Jeno
  10  *   Forstner, Matyas
  11  *
  12  ******************************************************************************/
  13 #ifndef _langviz_Node_HH
  14 #define _langviz_Node_HH
  15
  16 /**
  17  * Base class for AST-classes.
  18  */
  19 class Node {
  20 private:
  21   /** To detect missing/duplicated invoking of destructor. */
  22   static int counter;
  23 #ifdef MEMORY_DEBUG
  24   /** Linked list for tracking undeleted nodes. */
  25   Node *prev_node, *next_node;
  26 #endif
  27 protected:
  28   /** Default constructor. */
  29   Node();
  30   /** The copy constructor. */
  31   Node(const Node& p);
  32 public:
  33   /**
  34    * "Virtual constructor".
  35    */
  36   virtual Node* clone() const =0;
  37   /** The destructor. */
  38   virtual ~Node();
  39   /** Gives an error message if counter is not zero. It can be
  40    * invoked before the program exits (like check_mem_leak()) to
  41    * verify that all Nodes are destructed. */
  42   static void chk_counter();
  43 };
  44
  45 #endif // _langviz_Node_HH