mod.H

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#ifndef MOD_H_IS_INCLUDED
#define MOD_H_IS_INCLUDED

/*****************************************************************
 *  MOD:
 *
 *      A sequence number to determine if data in a
 *      dependency graph is up-to-date.
 *
 *****************************************************************/
#define CMOD const MOD
class MOD {
   static int   _TICK;
   static int   _START;
   int          _id;

 public:
   MOD()                                { _id = _TICK; }
   MOD(CMOD &id)                        { _id = id._id; }

   static void tick()                   { _START = ++_TICK; }
   bool   current()             const   { return _id >= _START; }
   int    val()                 const   { return _id; }
   MOD&   operator ++()                 { _id = ++_TICK; return *this; }
   int    operator ==(CMOD &id) const   { return _id == id._id; }
};

#endif // MOD_H_IS_INCLUDED

// end of file mod.H

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