#ifndef ABSTRACT_TAU_FUNCTION_11_27_2006
#define ABSTRACT_TAU_FUNCTION_11_27_2006
/**
    @file AbstractTauFunction.h
    @author Brian Magill
    @datecreated 11/27/2006

    $Date:$
    $Revision:$

    @copyright
     (©) Copyright 2006 by GATS Inc.
     11864 Canon Blvd., Suite 101, Newport News, VA 23606

     All Rights Reserved. No part of this software or publication may be
     reproduced, stored in a retrieval system, or transmitted, in any form
     or by any means, electronic, mechanical, photocopying, recording, or
     otherwise without the prior written permission of GATS Inc.

    @brief: Abstarct class for calculating what the refraction angle was (t - tau) ago    
 
    Overall TauFunction is a helper class to CalcRefraction.  
    Assumes that time and refraction values are inserted in 
    montonically increasing time.
    
*/
//----------------------------------------------------------------------
//

class AbstractTauFunction
    {

    public:
    
        virtual ~AbstractTauFunction() { };    

        virtual double operator( )(double const & currentTime) const = 0;   

        virtual void dump() const  = 0;
        
    };        

#endif