DataMuseum.dk

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    Length: 3497 (0xda9)
    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 Bird is

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

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

    procedure Free is new Unchecked_Deallocation (State, State_Ptr);


    function Create (Offspring_No : Natural := 0) return Object is
        This_Animal : Animal.Object;
        This_State_Ptr : State_Ptr;
        Animal_State_Ptr : Animal.State_Ptr;
    begin
        This_State_Ptr := new State;
        This_State_Ptr.Offspring_No := Offspring_No;
        This_State_Ptr.My_Feet := Foot.Create (Foot.It_Self);
        Foot.Set_Length (This_Foot => This_State_Ptr.My_Feet, Cm => 10);
        This_Animal := Animal.Create (2);
        Animal_State_Ptr := Animal.Part_Of (This_Animal);
        Animal.Set_Heir (Animal_State_Ptr,
                         Application_View_Of (This_State_Ptr));
        Text_Io.Put_Line ("A bird is born ...");

        return Object (This_Animal);
    end Create;


    procedure Delete (This_Bird : in out Object) is separate;


    procedure Set_Feather (This_Bird : Object; Number : Positive) is
    begin
        Part_Of (This_Bird).Feather_Number := Number;
    end Set_Feather;


    function Get_Feather (This_Bird : Object) return Positive is
    begin
        return Part_Of (This_Bird).Feather_Number;
    end Get_Feather;


    procedure Set_Nest (This_Bird : Object; This_Nest : Nest.Object) is
    begin
        Part_Of (This_Bird).My_Nest := This_Nest;
    end Set_Nest;


    function Get_Nest (This_Bird : Object) return Nest.Object is
    begin
        return Part_Of (This_Bird).My_Nest;
    end Get_Nest;


    function Get_Feet (This_Bird : Object) return Foot.Object is
    begin
        return Part_Of (This_Bird).My_Feet;
    end Get_Feet;


    package Self is
        procedure Sleep (This_Bird : Object);
        procedure Fly (This_Bird : Object);
    end Self;


    package body Self is separate;


    procedure Sleep (This_Bird : Object) is separate;


    procedure Fly (This_Bird : Object) is separate;


    procedure Imag (This_Bird : Object) is
    begin
        Text_Io.Put_Line ("bird is:");
        Animal.Image (Animal.Object (This_Bird));
        Text_Io.Put_Line ("bird state is:");
        Text_Io.Put_Line ("   nb plumes: " &
                          Positive'Image (Part_Of (This_Bird).Feather_Number));
        Foot.Image (Part_Of (This_Bird).My_Feet);
        Nest.Image (Part_Of (This_Bird).My_Nest);

    end Imag;


    function Part_Of (This_Bird : Object) return State_Ptr is
        This_State_Ptr : State_Ptr;
    begin
        This_State_Ptr :=
           Bird_View_Of (S => Animal.Get_Heir
                                 (Animal.Part_Of (Animal.Object (This_Bird))));
        if This_State_Ptr = null then
            raise Oo_Ada_Exception.Part_Of_Error;
        else
            return This_State_Ptr;
        end if;
    end Part_Of;


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


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

end Bird;