-- Created on: 1991-05-06
-- Created by: Laurent PAINNOT
-- Copyright (c) 1991-1999 Matra Datavision
-- Copyright (c) 1999-2014 OPEN CASCADE SAS
--
-- This file is part of Open CASCADE Technology software library.
--
-- This library is free software; you can redistribute it and/or modify it under
-- the terms of the GNU Lesser General Public License version 2.1 as published
-- by the Free Software Foundation, with special exception defined in the file
-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
-- distribution for complete text of the license and disclaimer of any warranty.
--
-- Alternatively, this file may be used under the terms of Open CASCADE
-- commercial license or contractual agreement.

deferred class Function from math

    	---Purpose: This abstract class describes the virtual functions 
    	--          associated with a Function of a single variable.

is

    Value(me: in out; X: Real; F: out Real)
    	---Purpose: Computes the value of the function <F> for a given value of
    	--          variable <X>. 
    	--          returns True if the computation was done successfully,
    	--          False otherwise.

    returns Boolean
    is deferred;


    GetStateNumber(me: in out)
    	---Purpose: returns the state of the function corresponding to the 
    	--          latest call of any methods associated with the function.
    	--          This function is called by each of the algorithms 
    	--          described later which defined the function Integer 
    	--          Algorithm::StateNumber(). The algorithm has the 
    	--          responsibility to call this function when it has found
    	--          a solution (i.e. a root or a minimum) and has to maintain
    	--          the association between the solution found and this
    	--          StateNumber.
    	--          Byu default, this method returns 0 (which means for the 
    	--          algorithm: no state has been saved). It is the 
    	--          responsibility of the programmer to decide if he needs
    	--          to save the current state of the function and to return
    	--          an Integer that allows retrieval of the state.

    returns Integer
    is virtual;

    
end Function;