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-- File: Function.cdl
-- Created: Mon May 6 10:54:17 1991
-- Author: Laurent PAINNOT
-- <lpa@topsn3>
---Copyright: Matra Datavision 1991, 1992
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;
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