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with Xlbt_Arithmetic;  
use Xlbt_Arithmetic;

package Ran1_Package is
------------------------------------------------------------------------------
-- Ran1 returns a uniform random deviate between 0.0 and 1.0.  Uses linear
-- congruential methods using three portable not-as-good random number
-- generators.  Near infinite period with no sensible sequential correlation.
--
-- Based upon:  Ran1, pg 196;
-- Numerical Recipes: The Art Of Scientific Computing
-- W. H. Press, B. P. Flannery, S. A. Teukolsky, W. T. Vetterling
-- Cambridge University Press, 1986
------------------------------------------------------------------------------

    type Ran1_Data is private;

    Null_Ran1_Data : constant Ran1_Data;

    function Ran1_Initialize (Iseed : S_Natural) return Ran1_Data;
------------------------------------------------------------------------------
--  Iseed   - Specifies the initial seed value to be passed to the RAN()
--              during our initialization.
-- Called to create and initialize a Ran1_Data area for use with Ran1.
------------------------------------------------------------------------------

    procedure Ran1_Free (Idum : in out Ran1_Data);
------------------------------------------------------------------------------
--  Idum        - Specifies the data area to free.
-- Called to free up the Ran1_Data area allocated by Ran1_Initialize.  It is
-- OK to call this with a null.
------------------------------------------------------------------------------

    function Ran1 (Idum : Ran1_Data) return Float;
------------------------------------------------------------------------------
--  Idum    - Specifies the Ran1_Data to use in calculating the next random
--              value.
-- Called to calculate the next uniform random deviate between 0.0 and 1.0.
------------------------------------------------------------------------------

private

    type Ran1_Data_Rec;  
    type Ran1_Data is access Ran1_Data_Rec;
--/ if R1000 then
    pragma Enable_Deallocation (Ran1_Data);

--/ end if;

    Null_Ran1_Data : constant Ran1_Data := null;

end Ran1_Package;