DataMuseum.dk

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    Length: 2480 (0x9b0)
    Types: TextFile
    Names: »B«

└─⟦a7d1ea751⟧ Bits:30000550 8mm tape, Rational 1000, !users!projects 94_04_11
    └─ ⟦129cab021⟧ »DATA« 
        └─⟦this⟧ 

TextFile

with Text_Io;
with Unchecked_Conversion;
with Unchecked_Deallocation;

package body Nest is

    type State is
        record
            Offspring_No : Natural;
            Heir : Application.Object;
            Number_Of_Place : Positive;
        end record;



    function Nest_View_Of is
       new Unchecked_Conversion
              (Source => Application.Object, Target => State_Ptr);

    function Application_View_Of is
       new Unchecked_Conversion (Source => State_Ptr,
                                 Target => Application.Object);

    procedure Free is new Unchecked_Deallocation (State, State_Ptr);


    function Create (Offspring_No : Natural := 0) return Object is
        This_Application : Application.Object;
        This_State_Ptr : State_Ptr;
    begin
        This_State_Ptr := new State;
        This_State_Ptr.Offspring_No := Offspring_No;
        This_Application := Application.Create (1);
        Application.Set_Heir (This_Application,
                              Application_View_Of (This_State_Ptr));
        Text_Io.Put_Line ("Building a new nest ...");

        return Object (This_Application);
    end Create;


    procedure Delete (This_Nest : in out Object) is
        This_State_Ptr : State_Ptr := Part_Of (This_Nest);
    begin
        Free (This_State_Ptr);
        Application.Delete (Application.Object (This_Nest));
    end Delete;


    procedure Set_Place (This_Nest : Object; Number : Positive) is
    begin
        Part_Of (This_Nest).Number_Of_Place := Number;
    end Set_Place;


    function Get_Place (This_Nest : Object) return Positive is
    begin
        return Part_Of (This_Nest).Number_Of_Place;
    end Get_Place;


    procedure Image (This_Nest : Object) is
    begin
        Text_Io.Put_Line ("Nest is:");
        Text_Io.Put_Line ("   number of places: " &
                          Positive'Image (Part_Of (This_Nest).Number_Of_Place));
    end Image;


    function Part_Of (This_Nest : Object) return State_Ptr is

    begin
        return Nest_View_Of (S => Application.Get_Heir
                                     (Application.Object (This_Nest)));
    end Part_Of;


    procedure Set_Heir (This_State_Ptr : in out State_Ptr;
                        Heir : Application.Object) is
    begin
        This_State_Ptr.Heir := Heir;
    end Set_Heir;


    function Get_Heir (This_State_Ptr : State_Ptr) return Application.Object is
    begin
        return This_State_Ptr.Heir;
    end Get_Heir;

end Nest;