#ifndef _INPUT_Q_HH_
#define _INPUT_Q_HH_

// Copyright (c) 1994-1996 Ohio Board of Regents and the University of
// Cincinnati.  All Rights Reserved.

// BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY 
// FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT 
// PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, 
// EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE 
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
// PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE 
// PROGRAM IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME 
// THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 

// IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 
// WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR 
// REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR 
// DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL 
// DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM 
// (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED 
// INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF 
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// OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 

// Authors: Philip A. Wilsey            phil.wilsey@uc.edu
//          Malolan Chetlur             mal@ececs.uc.edu
//---------------------------------------------------------------------------

//This is the abstract class for all input Q implementations in the kernel
//Different Q implementations are inheritied from this abstract class
//It is mandatory for the Q implementations to inherit from this class
//for the implementation to be usable in the Simulation kernel

#include "DefaultVTime.hh"

class BasicEvent;

class InputQ {
public:

  //Constructor for the abstract class
  InputQ() {};

  //virtual destructor
  virtual ~InputQ() {};

  virtual void insert(BasicEvent*) = 0;
  virtual BasicEvent* getEvent() = 0;
  virtual BasicEvent* peekEvent() = 0;
  virtual void garbageCollect(VTime* gTime) = 0;
  
};

#endif