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moves.h

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/*************************************************************************
*   FILE: moves.h
* AUTHOR: CAL
* DATE: 29 April 1993
* PURPOSE:
*   Declares a struct which represents a move:  a destination
*   node and a mode of transportation.
*   The struct can also be used to represent the connections between
*   any two nodes, because the transportation is a bit vector.
**************************************************************************/

#ifndef _MOVE_H
#define _MOVE_H

#include "typedefs.h"


/**********************************************************************
* Token Types
***********************************************************************/

typedef enum mode TokenType;
const byte NTokenTypes = 3;


/**********************************************************************
* STRUCT:  Move
***********************************************************************/

struct Move {
  int  Source;    // Source node;
  int  Node;    // Destination node
  byte Trans;   // Transportation type (bit vector)
  Move* Next;   // (for linking)
  Move (void) { Source = Node = Trans = 0;  Next = 0; }
  Move (int s, int n, int t)
    { Source = s; Node = n; Trans = t; Next = 0; }
  int operator == (Move& m)
    { return ((Source==m.Source)&&(Node==m.Node)&&(Trans==m.Trans)); }
  int operator != (Move& m)
    { return ((Source!=m.Source)||(Node!=m.Node)||(Trans!=m.Trans)); }
  ~Move (void) { delete Next; }
};

const Move NullMove;

/**********************************************************************
* Bit Masks
*
*   To set bit:
*   Trans |= <Mask>
* Or, to change entire vector:
*   Trans = <Mask1> | <Mask2> | ...
* To check whether bit is set:
*   (bool) Trans & <Mask>
*
* Where <Mask> is one of the following bit masks:
***********************************************************************/

const byte TaxiMask   = 0x01;
const byte BusMask    = 0x02;
const byte SubwayMask = 0x04;


/**********************************************************************
* CLASS:  MoveList
***********************************************************************/

class MoveList
{
  Move *First;
  Move *Last;
  Move *Current;
  int Len;
  void Insert (Move *a);
public:
  MoveList () { First = Last = Current = 0; Len = 0;}
  ~MoveList () { Nuke (); }
  void Append (Move *a);
  Move* GetCurrent (void) { return Current; }
  Move* GetLast (void) { return Last; }
  bool Reset (void);
  bool Next (void);
  int  Length (void) { return Len; }
  void Nuke (void);
};


#endif

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