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TextFile

package body Ensemble is

    -- TYPES ----------------------------

    type Elt is
        record
            Occupe : Boolean := False;
            Objet  : Item;
        end record;

    subtype Indice_Table is Natural range 0 .. 1000;

    type Table_Element is array (Indice_Table range <>) of Elt;

    type Ensemble_Elts (Taille : Indice_Table := 20) is
        record
            Elements : Table_Element (0 .. Taille);
        end record;


    -- VARIABLES ------------------------

    Un_Ensemble : Ensemble_Elts;


    -- PROCEDURES -----------------------

    function Ensemble_Plein return Boolean is
        Resultat : Boolean := True;
    begin
        for I in Un_Ensemble.Elements'Range loop
            Resultat := Resultat and Un_Ensemble.Elements (I).Occupe;
        end loop;
        return Resultat;
    end Ensemble_Plein;

    -------------------------------------

    function Premier_Libre return Indice_Table is

        I      : Indice_Table := Un_Ensemble.Elements'First;
        Trouve : Boolean      := False;
    begin

        while not Trouve loop
            Trouve := not Un_Ensemble.Elements (I).Occupe;
            if not Trouve then
                I := I + 1;
            end if;
        end loop;
        return I;
    end Premier_Libre;

    -------------------------------------------------------
    -- INTERFACE
    -------------------------------------------------------

    procedure Ajouter (Element : Item; Numero : out Natural) is

        Ajout    : Table_Element (0 .. Un_Ensemble.Taille);
        Position : Indice_Table;

    begin

        if Ensemble_Plein then
            Un_Ensemble.Elements := Un_Ensemble.Elements & Ajout;
        end if;

        Position := Premier_Libre;  
        Un_Ensemble.Elements (Position).Objet := Element;
        Numero := Position;

    end Ajouter;

    -------------------------------------------------------

    procedure Retirer (Numero : Natural) is
    begin
        Un_Ensemble.Elements (Numero).Occupe := False;
    end Retirer;


    -------------------------------------------------------

    procedure Lire (Numero : Natural; Element : out Item) is
    begin
        Element := Un_Ensemble.Elements (Numero).Objet;
    end Lire;

    -------------------------------------------------------

    procedure Ecrire (Numero : Natural; Element : Item) is
    begin
        Un_Ensemble.Elements (Numero).Objet := Element;
    end Ecrire;

    -------------------------------------------------------

    procedure Verifier is
    begin
        for I in Un_Ensemble.Elements'Range loop
            if Un_Ensemble.Elements (I).Occupe then
                Modifier (Un_Ensemble.Elements (I).Objet);
            end if;
        end loop;
    end Verifier;

    -------------------------------------------------------

    procedure Vider is
    begin
        for I in Un_Ensemble.Elements'Range loop
            Un_Ensemble.Elements (I).Occupe := False;
        end loop;
    end Vider;


end Ensemble;